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 <span id="projectnumber">v2.00 late beta</span>
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<div class="title">llfio_v2_xxx::lockable_io_handle Class Reference</div> </div>
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<p>A handle to something capable of scatter-gather i/o and which can exclude other concurrent users. Models <code>SharedMutex</code>, though note that the locks are per-handle, not per-thread.
<a href="classllfio__v2__xxx_1_1lockable__io__handle.html#details">More...</a></p>
<p><code>#include "lockable_io_handle.hpp"</code></p>
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Inheritance diagram for llfio_v2_xxx::lockable_io_handle:</div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="nested-classes"></a>
Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle_1_1extent__guard.html">extent_guard</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">EXTENSION: RAII holder a locked extent of bytes in a file. <a href="classllfio__v2__xxx_1_1lockable__io__handle_1_1extent__guard.html#details">More...</a><br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a79e1ddfc16d4d99a66f8a4781aeca28d"><td class="memItemLeft" align="right" valign="top"><a id="a79e1ddfc16d4d99a66f8a4781aeca28d"></a>
using </td><td class="memItemRight" valign="bottom"><b>path_type</b> = io_handle::path_type</td></tr>
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<tr class="memitem:a6e4f645419e6bc0fdc7a98adacd6a55e"><td class="memItemLeft" align="right" valign="top"><a id="a6e4f645419e6bc0fdc7a98adacd6a55e"></a>
using </td><td class="memItemRight" valign="bottom"><b>extent_type</b> = io_handle::extent_type</td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>size_type</b> = io_handle::size_type</td></tr>
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<tr class="memitem:a1985e0db6ebc628bb95e04929aa31734"><td class="memItemLeft" align="right" valign="top"><a id="a1985e0db6ebc628bb95e04929aa31734"></a>
using </td><td class="memItemRight" valign="bottom"><b>mode</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">io_handle::mode</a></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>creation</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">io_handle::creation</a></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>caching</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">io_handle::caching</a></td></tr>
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<tr class="memitem:a6b03587e739bdd91a0f0c2d1ea7d2759"><td class="memItemLeft" align="right" valign="top"><a id="a6b03587e739bdd91a0f0c2d1ea7d2759"></a>
using </td><td class="memItemRight" valign="bottom"><b>flag</b> = io_handle::flag</td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>buffer_type</b> = <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1buffer__type.html">io_handle::buffer_type</a></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>const_buffer_type</b> = <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1const__buffer__type.html">io_handle::const_buffer_type</a></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>buffers_type</b> = io_handle::buffers_type</td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>const_buffers_type</b> = io_handle::const_buffers_type</td></tr>
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template<class T > </td></tr>
<tr class="memitem:a57efa0829192c0cdfccbaf04ff6b4aac"><td class="memTemplItemLeft" align="right" valign="top">using </td><td class="memTemplItemRight" valign="bottom"><b>io_request</b> = <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_handle::io_request</a>< T ></td></tr>
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template<class T > </td></tr>
<tr class="memitem:ad77c47160cd14c10f2732136c22b7205"><td class="memTemplItemLeft" align="right" valign="top">using </td><td class="memTemplItemRight" valign="bottom"><b>io_result</b> = <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_handle::io_result</a>< T ></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>barrier_kind</b> = <a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26">io_multiplexer::barrier_kind</a></td></tr>
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using </td><td class="memItemRight" valign="bottom"><b>registered_buffer_type</b> = <a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#a9991b48f4cd8c77ef7fd31e6c48003b3">io_multiplexer::registered_buffer_type</a></td></tr>
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template<class T > </td></tr>
<tr class="memitem:ac7a2e68c2f5d49187ec3d179e40b33ea"><td class="memTemplItemLeft" align="right" valign="top">using </td><td class="memTemplItemRight" valign="bottom"><b>awaitable</b> = <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1awaitable.html">io_multiplexer::awaitable</a>< T ></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a4b3e88620e2a244900daf0918bcb8e5b"><td class="memItemLeft" align="right" valign="top"><a id="a4b3e88620e2a244900daf0918bcb8e5b"></a>
constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a4b3e88620e2a244900daf0918bcb8e5b">lockable_io_handle</a> ()</td></tr>
<tr class="memdesc:a4b3e88620e2a244900daf0918bcb8e5b"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <br /></td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a243d7abf50b2d0116b867f2f35f40daf">lockable_io_handle</a> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> h, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a>, flag <a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a>, <a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html">io_multiplexer</a> *ctx)</td></tr>
<tr class="memdesc:a243d7abf50b2d0116b867f2f35f40daf"><td class="mdescLeft"> </td><td class="mdescRight">Construct a handle from a supplied native handle. <br /></td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#aaeece0019d17116a8ca2a917c7d616bb">lockable_io_handle</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &&o, <a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html">io_multiplexer</a> *ctx) noexcept</td></tr>
<tr class="memdesc:aaeece0019d17116a8ca2a917c7d616bb"><td class="mdescLeft"> </td><td class="mdescRight">Explicit conversion from <code>handle</code> permitted. <br /></td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a052a5ff696cfbed2e9217f2bd66398e4">lockable_io_handle</a> (<a class="el" href="classllfio__v2__xxx_1_1io__handle.html">io_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:a052a5ff696cfbed2e9217f2bd66398e4"><td class="mdescLeft"> </td><td class="mdescRight">Explicit conversion from <code>io_handle</code> permitted. <br /></td></tr>
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<tr class="memitem:a518612e4231c17a80e8257c800658c8f"><td class="memItemLeft" align="right" valign="top"><a id="a518612e4231c17a80e8257c800658c8f"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a518612e4231c17a80e8257c800658c8f">lockable_io_handle</a> (<a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html">lockable_io_handle</a> &&)=default</td></tr>
<tr class="memdesc:a518612e4231c17a80e8257c800658c8f"><td class="mdescLeft"> </td><td class="mdescRight">Move construction permitted. <br /></td></tr>
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<tr class="memitem:ad408649b1b1cb36adffa9c554f26ea6e"><td class="memItemLeft" align="right" valign="top"><a id="ad408649b1b1cb36adffa9c554f26ea6e"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#ad408649b1b1cb36adffa9c554f26ea6e">lockable_io_handle</a> (const <a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html">lockable_io_handle</a> &)=delete</td></tr>
<tr class="memdesc:ad408649b1b1cb36adffa9c554f26ea6e"><td class="mdescLeft"> </td><td class="mdescRight">No copy construction (use <code>clone()</code>) <br /></td></tr>
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<tr class="memitem:a46197b92fa6bd143f42e2df1b21c99c4"><td class="memItemLeft" align="right" valign="top"><a id="a46197b92fa6bd143f42e2df1b21c99c4"></a>
<a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html">lockable_io_handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a46197b92fa6bd143f42e2df1b21c99c4">operator=</a> (<a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html">lockable_io_handle</a> &&)=default</td></tr>
<tr class="memdesc:a46197b92fa6bd143f42e2df1b21c99c4"><td class="mdescLeft"> </td><td class="mdescRight">Move assignment permitted. <br /></td></tr>
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<tr class="memitem:a892657b45719cc06869c4c9276759b31"><td class="memItemLeft" align="right" valign="top"><a id="a892657b45719cc06869c4c9276759b31"></a>
<a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html">lockable_io_handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a892657b45719cc06869c4c9276759b31">operator=</a> (const <a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html">lockable_io_handle</a> &)=delete</td></tr>
<tr class="memdesc:a892657b45719cc06869c4c9276759b31"><td class="mdescLeft"> </td><td class="mdescRight">No copy assignment. <br /></td></tr>
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<tr class="memitem:a469019e3bbcd7b37499b8604af713b40"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a469019e3bbcd7b37499b8604af713b40">lock_file</a> () noexcept</td></tr>
<tr class="memdesc:a469019e3bbcd7b37499b8604af713b40"><td class="mdescLeft"> </td><td class="mdescRight">Locks the inode referred to by the open handle for exclusive access. <a href="classllfio__v2__xxx_1_1lockable__io__handle.html#a469019e3bbcd7b37499b8604af713b40">More...</a><br /></td></tr>
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<tr class="memitem:a6e6a25ad5d9efd45e69d22e70a754a9e"><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a6e6a25ad5d9efd45e69d22e70a754a9e">try_lock_file</a> () noexcept</td></tr>
<tr class="memdesc:a6e6a25ad5d9efd45e69d22e70a754a9e"><td class="mdescLeft"> </td><td class="mdescRight">Tries to lock the inode referred to by the open handle for exclusive access, returning <code>false</code> if lock is currently unavailable. <a href="classllfio__v2__xxx_1_1lockable__io__handle.html#a6e6a25ad5d9efd45e69d22e70a754a9e">More...</a><br /></td></tr>
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<tr class="memitem:a561ef83b4fe400b59c9d92444913c180"><td class="memItemLeft" align="right" valign="top"><a id="a561ef83b4fe400b59c9d92444913c180"></a>
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a561ef83b4fe400b59c9d92444913c180">unlock_file</a> () noexcept</td></tr>
<tr class="memdesc:a561ef83b4fe400b59c9d92444913c180"><td class="mdescLeft"> </td><td class="mdescRight">Unlocks a previously acquired exclusive lock. <br /></td></tr>
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<tr class="memitem:aa24a432125e5b51b13f21d9b74fa4721"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#aa24a432125e5b51b13f21d9b74fa4721">lock_file_shared</a> () noexcept</td></tr>
<tr class="memdesc:aa24a432125e5b51b13f21d9b74fa4721"><td class="mdescLeft"> </td><td class="mdescRight">Locks the inode referred to by the open handle for shared access. <a href="classllfio__v2__xxx_1_1lockable__io__handle.html#aa24a432125e5b51b13f21d9b74fa4721">More...</a><br /></td></tr>
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<tr class="memitem:ad8e3d809cb954d99e228ee756bac1c64"><td class="memItemLeft" align="right" valign="top">virtual bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#ad8e3d809cb954d99e228ee756bac1c64">try_lock_file_shared</a> () noexcept</td></tr>
<tr class="memdesc:ad8e3d809cb954d99e228ee756bac1c64"><td class="mdescLeft"> </td><td class="mdescRight">Tries to lock the inode referred to by the open handle for shared access, returning <code>false</code> if lock is currently unavailable. <a href="classllfio__v2__xxx_1_1lockable__io__handle.html#ad8e3d809cb954d99e228ee756bac1c64">More...</a><br /></td></tr>
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<tr class="memitem:afc5ba16c0377a56b7e1a66a9c6d0a703"><td class="memItemLeft" align="right" valign="top"><a id="afc5ba16c0377a56b7e1a66a9c6d0a703"></a>
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#afc5ba16c0377a56b7e1a66a9c6d0a703">unlock_file_shared</a> () noexcept</td></tr>
<tr class="memdesc:afc5ba16c0377a56b7e1a66a9c6d0a703"><td class="mdescLeft"> </td><td class="mdescRight">Unlocks a previously acquired shared lock. <br /></td></tr>
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<tr class="memitem:a0ece4f0a48e1e67debc438a9742a1f4c"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle_1_1extent__guard.html">extent_guard</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a0ece4f0a48e1e67debc438a9742a1f4c">lock_file_range</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> offset, <a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> bytes, <a class="el" href="namespacellfio__v2__xxx.html#ae79486289ff1386b26d1ce60bb797d33">lock_kind</a> kind, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:a0ece4f0a48e1e67debc438a9742a1f4c"><td class="mdescLeft"> </td><td class="mdescRight">EXTENSION: Tries to lock the range of bytes specified for shared or exclusive access. Note that this may, or MAY NOT, observe whole file locks placed with <code>lock()</code>, <code>lock_shared()</code> etc. <a href="classllfio__v2__xxx_1_1lockable__io__handle.html#a0ece4f0a48e1e67debc438a9742a1f4c">More...</a><br /></td></tr>
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result< <a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle_1_1extent__guard.html">extent_guard</a> > </td><td class="memItemRight" valign="bottom"><b>lock_file_range</b> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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result< <a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle_1_1extent__guard.html">extent_guard</a> > </td><td class="memItemRight" valign="bottom"><b>lock_file_range</b> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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template<class... Args> </td></tr>
<tr class="memitem:a393d056936c3f262aff76ed406858a95"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_lock_file_range</b> (Args &&... args) noexcept</td></tr>
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template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:ae3b16c444914200a7e5ab3cd0ba2d002"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_lock_file_range_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:a7727a23852d90bd5ea4e47044d20cfee"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_lock_file_range_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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<tr class="memitem:a5572735777dfdd3f7c5c1f6dc8260287"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle.html#a5572735777dfdd3f7c5c1f6dc8260287">unlock_file_range</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> offset, <a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> bytes) noexcept</td></tr>
<tr class="memdesc:a5572735777dfdd3f7c5c1f6dc8260287"><td class="mdescLeft"> </td><td class="mdescRight">EXTENSION: Unlocks a byte range previously locked. <a href="classllfio__v2__xxx_1_1lockable__io__handle.html#a5572735777dfdd3f7c5c1f6dc8260287">More...</a><br /></td></tr>
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<tr class="memitem:a8f174dc8dd23664251ee2a4f767283c2"><td class="memItemLeft" align="right" valign="top"><a id="a8f174dc8dd23664251ee2a4f767283c2"></a>
virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a8f174dc8dd23664251ee2a4f767283c2">close</a> () noexcept override</td></tr>
<tr class="memdesc:a8f174dc8dd23664251ee2a4f767283c2"><td class="mdescLeft"> </td><td class="mdescRight">Immediately close the native handle type managed by this handle. <br /></td></tr>
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<tr class="memitem:ac44b02d62334e55b99a5668d67ad484e"><td class="memItemLeft" align="right" valign="top"><a id="ac44b02d62334e55b99a5668d67ad484e"></a>
<a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html">io_multiplexer</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#ac44b02d62334e55b99a5668d67ad484e">multiplexer</a> () const noexcept</td></tr>
<tr class="memdesc:ac44b02d62334e55b99a5668d67ad484e"><td class="mdescLeft"> </td><td class="mdescRight">The i/o multiplexer this handle will use to multiplex i/o. If this returns null, then this handle has not been registered with an i/o multiplexer yet. <br /></td></tr>
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<tr class="memitem:a281467f83f70f2e12aaedf5847fd818c"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a281467f83f70f2e12aaedf5847fd818c">set_multiplexer</a> (<a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html">io_multiplexer</a> *c=<a class="el" href="namespacellfio__v2__xxx_1_1this__thread.html#afd6a1f179a8f8027f6c051badadf2707">this_thread::multiplexer</a>()) noexcept</td></tr>
<tr class="memdesc:a281467f83f70f2e12aaedf5847fd818c"><td class="mdescLeft"> </td><td class="mdescRight">Sets the i/o multiplexer this handle will use to implement <code>read()</code>, <code>write()</code> and <code>barrier()</code>. <a href="classllfio__v2__xxx_1_1io__handle.html#a281467f83f70f2e12aaedf5847fd818c">More...</a><br /></td></tr>
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<tr class="memitem:aa3465a87f2c732cd6465cd3a832a26f0"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#aa3465a87f2c732cd6465cd3a832a26f0">max_buffers</a> () const noexcept</td></tr>
<tr class="memdesc:aa3465a87f2c732cd6465cd3a832a26f0"><td class="mdescLeft"> </td><td class="mdescRight">The <em>maximum</em> number of buffers which a single read or write syscall can (atomically) process at a time for this specific open handle. On POSIX, this is known as <code>IOV_MAX</code>. Preferentially uses any i/o multiplexer set over the virtually overridable per-class implementation. <a href="classllfio__v2__xxx_1_1io__handle.html#aa3465a87f2c732cd6465cd3a832a26f0">More...</a><br /></td></tr>
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<tr class="memitem:a97ac1b43da39d9935919ac848ee3e8d3"><td class="memItemLeft" align="right" valign="top">result< registered_buffer_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a97ac1b43da39d9935919ac848ee3e8d3">allocate_registered_buffer</a> (size_t &bytes) noexcept</td></tr>
<tr class="memdesc:a97ac1b43da39d9935919ac848ee3e8d3"><td class="mdescLeft"> </td><td class="mdescRight">Request the allocation of a new registered i/o buffer with the system suitable for maximum performance i/o, preferentially using any i/o multiplexer set over the virtually overridable per-class implementation. <a href="classllfio__v2__xxx_1_1io__handle.html#a97ac1b43da39d9935919ac848ee3e8d3">More...</a><br /></td></tr>
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<tr class="memitem:ae04ada27942187f03b59044cd1328f49"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< buffers_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#ae04ada27942187f03b59044cd1328f49">read</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:ae04ada27942187f03b59044cd1328f49"><td class="mdescLeft"> </td><td class="mdescRight">Read data from the open handle, preferentially using any i/o multiplexer set over the virtually overridable per-class implementation. <a href="classllfio__v2__xxx_1_1io__handle.html#ae04ada27942187f03b59044cd1328f49">More...</a><br /></td></tr>
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<tr class="memitem:a411cebe2880393c7c61caa6a168b128b"><td class="memItemLeft" align="right" valign="top"><a id="a411cebe2880393c7c61caa6a168b128b"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< buffers_type > </td><td class="memItemRight" valign="bottom"><b>read</b> (registered_buffer_type base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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<tr class="memitem:aac0369e8025ae1320e7d607922f61b48"><td class="memItemLeft" align="right" valign="top"><a id="aac0369e8025ae1320e7d607922f61b48"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< <a class="el" href="classllfio__v2__xxx_1_1handle.html#aed9587571c3fb932adadddc1beeeed58">size_type</a> > </td><td class="memItemRight" valign="bottom"><b>read</b> (<a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> offset, std::initializer_list< <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1buffer__type.html">buffer_type</a> > lst, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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template<class... Args> </td></tr>
<tr class="memitem:a785c739c96c277a7a75135ee3b77548a"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_read</b> (Args &&... args) noexcept</td></tr>
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template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:ab955e35f67130e85f13048f984b3b5ac"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_read_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:a1c3fa301d864c8863c4b464a10aec4e0"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_read_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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<tr class="memitem:a7848ef15e774eacec7e4446a8c365a3d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a7848ef15e774eacec7e4446a8c365a3d">write</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:a7848ef15e774eacec7e4446a8c365a3d"><td class="mdescLeft"> </td><td class="mdescRight">Write data to the open handle, preferentially using any i/o multiplexer set over the virtually overridable per-class implementation. <a href="classllfio__v2__xxx_1_1io__handle.html#a7848ef15e774eacec7e4446a8c365a3d">More...</a><br /></td></tr>
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<tr class="memitem:a31ccfbd651d91a4f00e5192e0614cf6c"><td class="memItemLeft" align="right" valign="top"><a id="a31ccfbd651d91a4f00e5192e0614cf6c"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><b>write</b> (registered_buffer_type base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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<tr class="memitem:ab500784aa806dc7c2d90028d2f72de57"><td class="memItemLeft" align="right" valign="top"><a id="ab500784aa806dc7c2d90028d2f72de57"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< <a class="el" href="classllfio__v2__xxx_1_1handle.html#aed9587571c3fb932adadddc1beeeed58">size_type</a> > </td><td class="memItemRight" valign="bottom"><b>write</b> (<a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> offset, std::initializer_list< <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1const__buffer__type.html">const_buffer_type</a> > lst, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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template<class... Args> </td></tr>
<tr class="memitem:aee4c492a592eb15a5bf48e2d3deeec3a"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_write</b> (Args &&... args) noexcept</td></tr>
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template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:ac93b34407da6944f70000b1dd656c8e7"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_write_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:ae8f08b7afac7020b8901eb9d353a817e"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_write_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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<tr class="memitem:a6a1044eeb6ab16939e4669bbeb071b32"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a6a1044eeb6ab16939e4669bbeb071b32">barrier</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs=<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type >(), <a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26">barrier_kind</a> kind=<a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26a2f6648dac37731813bb84ae9b24bdfdb">barrier_kind::nowait_data_only</a>, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:a6a1044eeb6ab16939e4669bbeb071b32"><td class="mdescLeft"> </td><td class="mdescRight">Issue a write reordering barrier such that writes preceding the barrier will reach storage before writes after this barrier, preferentially using any i/o multiplexer set over the virtually overridable per-class implementation. <a href="classllfio__v2__xxx_1_1io__handle.html#a6a1044eeb6ab16939e4669bbeb071b32">More...</a><br /></td></tr>
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<tr class="memitem:aa38e8a96767e65a11b7b12b08a4b44ca"><td class="memItemLeft" align="right" valign="top"><a id="aa38e8a96767e65a11b7b12b08a4b44ca"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><b>barrier</b> (<a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26">barrier_kind</a> kind, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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template<class... Args> </td></tr>
<tr class="memitem:a89cb37107cf0ec70dc99ae1f944c1b1b"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_barrier</b> (Args &&... args) noexcept</td></tr>
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template<class... Args, class Rep , class Period > </td></tr>
<tr class="memitem:ad021935ffbf5f753f123ac5af723184f"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_barrier_for</b> (Args &&... args, const std::chrono::duration< Rep, Period > &duration) noexcept</td></tr>
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template<class... Args, class Clock , class Duration > </td></tr>
<tr class="memitem:a2427c3fc217848e107af94fb0f1590ba"><td class="memTemplItemLeft" align="right" valign="top">bool </td><td class="memTemplItemRight" valign="bottom"><b>try_barrier_until</b> (Args &&... args, const std::chrono::time_point< Clock, Duration > &timeout) noexcept</td></tr>
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<tr class="memitem:a30eca672189ffc408a4e01b064e8b78e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1awaitable.html">awaitable</a>< <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< buffers_type > > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a30eca672189ffc408a4e01b064e8b78e">co_read</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:a30eca672189ffc408a4e01b064e8b78e"><td class="mdescLeft"> </td><td class="mdescRight">A coroutinised equivalent to <code>.read()</code> which suspends the coroutine until the i/o finishes. <b>Blocks execution</b> i.e is equivalent to <code>.read()</code> if no i/o multiplexer has been set on this handle! <a href="classllfio__v2__xxx_1_1io__handle.html#a30eca672189ffc408a4e01b064e8b78e">More...</a><br /></td></tr>
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<tr class="memitem:a883a0fd7de8f10fd8b67a8aee415d735"><td class="memItemLeft" align="right" valign="top"><a id="a883a0fd7de8f10fd8b67a8aee415d735"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1awaitable.html">awaitable</a>< <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< buffers_type > > </td><td class="memItemRight" valign="bottom"><b>co_read</b> (registered_buffer_type base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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<tr class="memitem:a608634d1664d2a43fbdc2e18cae464ee"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1awaitable.html">awaitable</a>< <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a608634d1664d2a43fbdc2e18cae464ee">co_write</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:a608634d1664d2a43fbdc2e18cae464ee"><td class="mdescLeft"> </td><td class="mdescRight">A coroutinised equivalent to <code>.write()</code> which suspends the coroutine until the i/o finishes. <b>Blocks execution</b> i.e is equivalent to <code>.write()</code> if no i/o multiplexer has been set on this handle! <a href="classllfio__v2__xxx_1_1io__handle.html#a608634d1664d2a43fbdc2e18cae464ee">More...</a><br /></td></tr>
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<tr class="memitem:aa1847e17496a22bc107f509c3cdfecdd"><td class="memItemLeft" align="right" valign="top"><a id="aa1847e17496a22bc107f509c3cdfecdd"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1awaitable.html">awaitable</a>< <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > > </td><td class="memItemRight" valign="bottom"><b>co_write</b> (registered_buffer_type base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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<tr class="memitem:a359f780e7468407b38978cc5eb7b2555"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1awaitable.html">awaitable</a>< <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a359f780e7468407b38978cc5eb7b2555">co_barrier</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs=<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type >(), <a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26">barrier_kind</a> kind=<a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26a2f6648dac37731813bb84ae9b24bdfdb">barrier_kind::nowait_data_only</a>, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:a359f780e7468407b38978cc5eb7b2555"><td class="mdescLeft"> </td><td class="mdescRight">A coroutinised equivalent to <code>.barrier()</code> which suspends the coroutine until the i/o finishes. <b>Blocks execution</b> i.e is equivalent to <code>.barrier()</code> if no i/o multiplexer has been set on this handle! <a href="classllfio__v2__xxx_1_1io__handle.html#a359f780e7468407b38978cc5eb7b2555">More...</a><br /></td></tr>
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<tr class="memitem:ac5222904f116c9beb0515a4a5aa850bf"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac5222904f116c9beb0515a4a5aa850bf">QUICKCPPLIB_BITFIELD_BEGIN</a> (flag)</td></tr>
<tr class="memdesc:ac5222904f116c9beb0515a4a5aa850bf"><td class="mdescLeft"> </td><td class="mdescRight">Bitwise flags which can be specified. <a href="classllfio__v2__xxx_1_1handle.html#ac5222904f116c9beb0515a4a5aa850bf">More...</a><br /></td></tr>
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 </td><td class="memItemRight" valign="bottom"><b>QUICKCPPLIB_BITFIELD_END</b> (flag)</td></tr>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4716696b8700953889006251e0678aa4">swap</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a4716696b8700953889006251e0678aa4"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br /></td></tr>
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<tr class="memitem:a00a85eec5a41f7edb2c574d40cf04535"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="classllfio__v2__xxx_1_1handle.html#a33481bae57d9ccd0c97946416f9682f3">path_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a00a85eec5a41f7edb2c574d40cf04535">current_path</a> () const noexcept</td></tr>
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<tr class="memitem:aeea4389189021b94dde6d8f2c3ccc5b3"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aeea4389189021b94dde6d8f2c3ccc5b3">clone</a> () const noexcept</td></tr>
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virtual <a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a1d273e38c061eb11f5012f624e9a202e">release</a> () noexcept</td></tr>
<tr class="memdesc:a1d273e38c061eb11f5012f624e9a202e"><td class="mdescLeft"> </td><td class="mdescRight">Release the native handle type managed by this handle. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a5c7f6a0a8ffdea22763c75a9319ba0c2">is_valid</a> () const noexcept</td></tr>
<tr class="memdesc:a5c7f6a0a8ffdea22763c75a9319ba0c2"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is valid (and usually open) <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a97e0884c27147b4929be98961b8e9254">is_readable</a> () const noexcept</td></tr>
<tr class="memdesc:a97e0884c27147b4929be98961b8e9254"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is readable. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a211fee447a47bdeb5424a2a5ae1de852">is_writable</a> () const noexcept</td></tr>
<tr class="memdesc:a211fee447a47bdeb5424a2a5ae1de852"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is writable. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac3aa3dc009822c0e437f317864534feb">is_append_only</a> () const noexcept</td></tr>
<tr class="memdesc:ac3aa3dc009822c0e437f317864534feb"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is append only. <br /></td></tr>
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<tr class="memitem:a101620e9fff0c0e8c346af0e9de58b6a"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a101620e9fff0c0e8c346af0e9de58b6a">set_append_only</a> (bool enable) noexcept</td></tr>
<tr class="memdesc:a101620e9fff0c0e8c346af0e9de58b6a"><td class="mdescLeft"> </td><td class="mdescRight">EXTENSION: Changes whether this handle is append only or not. <a href="classllfio__v2__xxx_1_1handle.html#a101620e9fff0c0e8c346af0e9de58b6a">More...</a><br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ade2416b9154d1e56937c99cd514324f8">is_multiplexable</a> () const noexcept</td></tr>
<tr class="memdesc:ade2416b9154d1e56937c99cd514324f8"><td class="mdescLeft"> </td><td class="mdescRight">True if multiplexable. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a501aa723172f6852e82738b0969278ae">is_nonblocking</a> () const noexcept</td></tr>
<tr class="memdesc:a501aa723172f6852e82738b0969278ae"><td class="mdescLeft"> </td><td class="mdescRight">True if nonblocking. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a695ce0ed1606d540cfa452790ea71632">is_seekable</a> () const noexcept</td></tr>
<tr class="memdesc:a695ce0ed1606d540cfa452790ea71632"><td class="mdescLeft"> </td><td class="mdescRight">True if seekable. <br /></td></tr>
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<tr class="memitem:a751e912d8dab755ea969a418c1d544eb"><td class="memItemLeft" align="right" valign="top"><a id="a751e912d8dab755ea969a418c1d544eb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a751e912d8dab755ea969a418c1d544eb">requires_aligned_io</a> () const noexcept</td></tr>
<tr class="memdesc:a751e912d8dab755ea969a418c1d544eb"><td class="mdescLeft"> </td><td class="mdescRight">True if requires aligned i/o. <br /></td></tr>
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bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a7751fbb4b1aff527f469412ea33116ed">is_regular</a> () const noexcept</td></tr>
<tr class="memdesc:a7751fbb4b1aff527f469412ea33116ed"><td class="mdescLeft"> </td><td class="mdescRight">True if a regular file or device. <br /></td></tr>
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<tr class="memitem:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="memItemLeft" align="right" valign="top"><a id="a4ca48bdcd6d6bf8b41d0cebb304fe9ce"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ca48bdcd6d6bf8b41d0cebb304fe9ce">is_directory</a> () const noexcept</td></tr>
<tr class="memdesc:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="mdescLeft"> </td><td class="mdescRight">True if a directory. <br /></td></tr>
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<tr class="memitem:ae0d5de068f71628e9491c5669f89dca0"><td class="memItemLeft" align="right" valign="top"><a id="ae0d5de068f71628e9491c5669f89dca0"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ae0d5de068f71628e9491c5669f89dca0">is_symlink</a> () const noexcept</td></tr>
<tr class="memdesc:ae0d5de068f71628e9491c5669f89dca0"><td class="mdescLeft"> </td><td class="mdescRight">True if a symlink. <br /></td></tr>
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<tr class="memitem:ac52242425f6e71c3fddcb6cdbe2c3b4e"><td class="memItemLeft" align="right" valign="top"><a id="ac52242425f6e71c3fddcb6cdbe2c3b4e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac52242425f6e71c3fddcb6cdbe2c3b4e">is_pipe</a> () const noexcept</td></tr>
<tr class="memdesc:ac52242425f6e71c3fddcb6cdbe2c3b4e"><td class="mdescLeft"> </td><td class="mdescRight">True if a pipe. <br /></td></tr>
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<tr class="memitem:ac9280ab1e6f2a65bc73ee0cba5a8deea"><td class="memItemLeft" align="right" valign="top"><a id="ac9280ab1e6f2a65bc73ee0cba5a8deea"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac9280ab1e6f2a65bc73ee0cba5a8deea">is_socket</a> () const noexcept</td></tr>
<tr class="memdesc:ac9280ab1e6f2a65bc73ee0cba5a8deea"><td class="mdescLeft"> </td><td class="mdescRight">True if a socket. <br /></td></tr>
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<tr class="memitem:a018de0f7c177e3cff239016d14582e9a"><td class="memItemLeft" align="right" valign="top"><a id="a018de0f7c177e3cff239016d14582e9a"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a018de0f7c177e3cff239016d14582e9a">is_multiplexer</a> () const noexcept</td></tr>
<tr class="memdesc:a018de0f7c177e3cff239016d14582e9a"><td class="mdescLeft"> </td><td class="mdescRight">True if a multiplexer like BSD kqueues, Linux epoll or Windows IOCP. <br /></td></tr>
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<tr class="memitem:ade0d0e05b844e77f425669da87bf48bb"><td class="memItemLeft" align="right" valign="top"><a id="ade0d0e05b844e77f425669da87bf48bb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ade0d0e05b844e77f425669da87bf48bb">is_process</a> () const noexcept</td></tr>
<tr class="memdesc:ade0d0e05b844e77f425669da87bf48bb"><td class="mdescLeft"> </td><td class="mdescRight">True if a process. <br /></td></tr>
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<tr class="memitem:a354c9168af7759f7151a071c1e1b7b19"><td class="memItemLeft" align="right" valign="top"><a id="a354c9168af7759f7151a071c1e1b7b19"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a354c9168af7759f7151a071c1e1b7b19">is_section</a> () const noexcept</td></tr>
<tr class="memdesc:a354c9168af7759f7151a071c1e1b7b19"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory section. <br /></td></tr>
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<tr class="memitem:a028fbead3b3c4d4eed2da7fa51c75036"><td class="memItemLeft" align="right" valign="top"><a id="a028fbead3b3c4d4eed2da7fa51c75036"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a028fbead3b3c4d4eed2da7fa51c75036">is_allocation</a> () const noexcept</td></tr>
<tr class="memdesc:a028fbead3b3c4d4eed2da7fa51c75036"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory allocation. <br /></td></tr>
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<tr class="memitem:a90bf8668df002dac5a7d9397486b2946"><td class="memItemLeft" align="right" valign="top"><a id="a90bf8668df002dac5a7d9397486b2946"></a>
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a90bf8668df002dac5a7d9397486b2946">kernel_caching</a> () const noexcept</td></tr>
<tr class="memdesc:a90bf8668df002dac5a7d9397486b2946"><td class="mdescLeft"> </td><td class="mdescRight">Kernel cache strategy used by this handle. <br /></td></tr>
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<tr class="memitem:a7126a726b2a06e4c1eca1a94c41163ff"><td class="memItemLeft" align="right" valign="top"><a id="a7126a726b2a06e4c1eca1a94c41163ff"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a7126a726b2a06e4c1eca1a94c41163ff">are_reads_from_cache</a> () const noexcept</td></tr>
<tr class="memdesc:a7126a726b2a06e4c1eca1a94c41163ff"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle uses the kernel page cache for reads. <br /></td></tr>
<tr class="separator:a7126a726b2a06e4c1eca1a94c41163ff"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8036792f332459064172d7b0cfaee3cf"><td class="memItemLeft" align="right" valign="top"><a id="a8036792f332459064172d7b0cfaee3cf"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a8036792f332459064172d7b0cfaee3cf">are_writes_durable</a> () const noexcept</td></tr>
<tr class="memdesc:a8036792f332459064172d7b0cfaee3cf"><td class="mdescLeft"> </td><td class="mdescRight">True if writes are safely on storage on completion. <br /></td></tr>
<tr class="separator:a8036792f332459064172d7b0cfaee3cf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="memItemLeft" align="right" valign="top"><a id="a0a2a5896f5e373fa032cdae1c1fff2c1"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a0a2a5896f5e373fa032cdae1c1fff2c1">are_safety_barriers_issued</a> () const noexcept</td></tr>
<tr class="memdesc:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="mdescLeft"> </td><td class="mdescRight">True if issuing safety fsyncs is on. <br /></td></tr>
<tr class="separator:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a013936bc1254b1a47567fe29698d1b1c"><td class="memItemLeft" align="right" valign="top"><a id="a013936bc1254b1a47567fe29698d1b1c"></a>
flag </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a> () const noexcept</td></tr>
<tr class="memdesc:a013936bc1254b1a47567fe29698d1b1c"><td class="mdescLeft"> </td><td class="mdescRight">The flags this handle was opened with. <br /></td></tr>
<tr class="separator:a013936bc1254b1a47567fe29698d1b1c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a942b0d276c9f20fe41baab679b88fe72"><td class="memItemLeft" align="right" valign="top"><a id="a942b0d276c9f20fe41baab679b88fe72"></a>
<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a942b0d276c9f20fe41baab679b88fe72">native_handle</a> () const noexcept</td></tr>
<tr class="memdesc:a942b0d276c9f20fe41baab679b88fe72"><td class="mdescLeft"> </td><td class="mdescRight">The native handle used by this handle. <br /></td></tr>
<tr class="separator:a942b0d276c9f20fe41baab679b88fe72"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr class="memitem:ae5ec845b3e2c2e31c2dc3de1d276a7e3"><td class="memItemLeft" align="right" valign="top"><a id="ae5ec845b3e2c2e31c2dc3de1d276a7e3"></a>
virtual size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#ae5ec845b3e2c2e31c2dc3de1d276a7e3">_do_max_buffers</a> () const noexcept</td></tr>
<tr class="memdesc:ae5ec845b3e2c2e31c2dc3de1d276a7e3"><td class="mdescLeft"> </td><td class="mdescRight">The virtualised implementation of <code>max_buffers()</code> used if no multiplexer has been set. <br /></td></tr>
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<tr class="memitem:ad17b8879c355d86174187f198b70baaa"><td class="memItemLeft" align="right" valign="top"><a id="ad17b8879c355d86174187f198b70baaa"></a>
virtual result< registered_buffer_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#ad17b8879c355d86174187f198b70baaa">_do_allocate_registered_buffer</a> (size_t &bytes) noexcept</td></tr>
<tr class="memdesc:ad17b8879c355d86174187f198b70baaa"><td class="mdescLeft"> </td><td class="mdescRight">The virtualised implementation of <code>allocate_registered_buffer()</code> used if no multiplexer has been set. <br /></td></tr>
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<tr class="memitem:a4379e3f84b913f606bb2ec6a194d4380"><td class="memItemLeft" align="right" valign="top"><a id="a4379e3f84b913f606bb2ec6a194d4380"></a>
virtual <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< buffers_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a4379e3f84b913f606bb2ec6a194d4380">_do_read</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d) noexcept</td></tr>
<tr class="memdesc:a4379e3f84b913f606bb2ec6a194d4380"><td class="mdescLeft"> </td><td class="mdescRight">The virtualised implementation of <code>read()</code> used if no multiplexer has been set. <br /></td></tr>
<tr class="separator:a4379e3f84b913f606bb2ec6a194d4380"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:adc47501ff4d4278e497758643ddb332a"><td class="memItemLeft" align="right" valign="top"><a id="adc47501ff4d4278e497758643ddb332a"></a>
virtual <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< buffers_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#adc47501ff4d4278e497758643ddb332a">_do_read</a> (registered_buffer_type base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d) noexcept</td></tr>
<tr class="memdesc:adc47501ff4d4278e497758643ddb332a"><td class="mdescLeft"> </td><td class="mdescRight">The virtualised implementation of <code>read()</code> used if no multiplexer has been set. <br /></td></tr>
<tr class="separator:adc47501ff4d4278e497758643ddb332a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2102f73a4872e8fd8bbe1c71ef82c97f"><td class="memItemLeft" align="right" valign="top"><a id="a2102f73a4872e8fd8bbe1c71ef82c97f"></a>
virtual <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a2102f73a4872e8fd8bbe1c71ef82c97f">_do_write</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d) noexcept</td></tr>
<tr class="memdesc:a2102f73a4872e8fd8bbe1c71ef82c97f"><td class="mdescLeft"> </td><td class="mdescRight">The virtualised implementation of <code>write()</code> used if no multiplexer has been set. <br /></td></tr>
<tr class="separator:a2102f73a4872e8fd8bbe1c71ef82c97f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa0611d9a49a6d5fd5ffd713ecaf4da1f"><td class="memItemLeft" align="right" valign="top"><a id="aa0611d9a49a6d5fd5ffd713ecaf4da1f"></a>
virtual <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#aa0611d9a49a6d5fd5ffd713ecaf4da1f">_do_write</a> (registered_buffer_type base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d) noexcept</td></tr>
<tr class="memdesc:aa0611d9a49a6d5fd5ffd713ecaf4da1f"><td class="mdescLeft"> </td><td class="mdescRight">The virtualised implementation of <code>write()</code> used if no multiplexer has been set. <br /></td></tr>
<tr class="separator:aa0611d9a49a6d5fd5ffd713ecaf4da1f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0f1d67fa1ad7f0d0b1256b6138929d60"><td class="memItemLeft" align="right" valign="top"><a id="a0f1d67fa1ad7f0d0b1256b6138929d60"></a>
virtual <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1io__handle.html#a0f1d67fa1ad7f0d0b1256b6138929d60">_do_barrier</a> (<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26">barrier_kind</a> kind, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d) noexcept</td></tr>
<tr class="memdesc:a0f1d67fa1ad7f0d0b1256b6138929d60"><td class="mdescLeft"> </td><td class="mdescRight">The virtualised implementation of <code>barrier()</code> used if no multiplexer has been set. <br /></td></tr>
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<tr class="memitem:a684c961072904a3a7c83198aa595bb0d"><td class="memItemLeft" align="right" valign="top"><a id="a684c961072904a3a7c83198aa595bb0d"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< buffers_type > </td><td class="memItemRight" valign="bottom"><b>_do_multiplexer_read</b> (registered_buffer_type &&base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d) noexcept</td></tr>
<tr class="separator:a684c961072904a3a7c83198aa595bb0d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aea936231e3b8113562b9923bb660d64a"><td class="memItemLeft" align="right" valign="top"><a id="aea936231e3b8113562b9923bb660d64a"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><b>_do_multiplexer_write</b> (registered_buffer_type &&base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d) noexcept</td></tr>
<tr class="separator:aea936231e3b8113562b9923bb660d64a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6ad2a78d5e63c1f12f34e496e2cc999e"><td class="memItemLeft" align="right" valign="top"><a id="a6ad2a78d5e63c1f12f34e496e2cc999e"></a>
<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a>< const_buffers_type > </td><td class="memItemRight" valign="bottom"><b>_do_multiplexer_barrier</b> (registered_buffer_type &&base, <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > reqs, <a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26">barrier_kind</a> kind, <a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> d) noexcept</td></tr>
<tr class="separator:a6ad2a78d5e63c1f12f34e496e2cc999e"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-static-methods"></a>
Static Protected Member Functions</h2></td></tr>
<tr class="memitem:a1dd1abc0bd1fa1f10782301dddf802b7"><td class="memItemLeft" align="right" valign="top"><a id="a1dd1abc0bd1fa1f10782301dddf802b7"></a>
static constexpr void </td><td class="memItemRight" valign="bottom"><b>_set_caching</b> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> &nativeh, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a>) noexcept</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-attribs"></a>
Protected Attributes</h2></td></tr>
<tr class="memitem:aa0f48150ffdbd275ac910ecb70be282c"><td class="memItemLeft" align="right" valign="top"><a id="aa0f48150ffdbd275ac910ecb70be282c"></a>
<a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html">io_multiplexer</a> * </td><td class="memItemRight" valign="bottom"><b>_ctx</b> {nullptr}</td></tr>
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<tr class="memitem:a1d6911771ac743fd9d64063c12429deb"><td class="memItemLeft" align="right" valign="top"><a id="a1d6911771ac743fd9d64063c12429deb"></a>
<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><b>_v</b></td></tr>
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<tr class="memitem:ad758cf1eb2e0b4c63583eab05e7f6820"><td class="memItemLeft" align="right" valign="top"><a id="ad758cf1eb2e0b4c63583eab05e7f6820"></a>
flag </td><td class="memItemRight" valign="bottom"><b>_flags</b> {flag::none}</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A handle to something capable of scatter-gather i/o and which can exclude other concurrent users. Models <code>SharedMutex</code>, though note that the locks are per-handle, not per-thread. </p>
<dl class="section note"><dt>Note</dt><dd>On Microsoft Windows, we lock the maximum possible byte <code>(2^64-1)</code> as the closest available emulation of advisory whole-file locking. This causes byte range locks to work (probably) independently of these locks. </dd></dl>
</div><h2 class="groupheader">Member Function Documentation</h2>
<a id="a97ac1b43da39d9935919ac848ee3e8d3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a97ac1b43da39d9935919ac848ee3e8d3">◆ </a></span>allocate_registered_buffer()</h2>
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<td class="memname">result<registered_buffer_type> llfio_v2_xxx::io_handle::allocate_registered_buffer </td>
<td>(</td>
<td class="paramtype">size_t & </td>
<td class="paramname"><em>bytes</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">noexcept</span><span class="mlabel">inherited</span></span> </td>
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<p>Request the allocation of a new registered i/o buffer with the system suitable for maximum performance i/o, preferentially using any i/o multiplexer set over the virtually overridable per-class implementation. </p>
<dl class="section return"><dt>Returns</dt><dd>A shared pointer to the i/o buffer. Note that the pointer returned is not the resource under management, using shared ptr's aliasing feature. </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">bytes</td><td>The size of the i/o buffer requested. This may be rounded (considerably) upwards, you should always use the value returned.</td></tr>
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<p>Some i/o multiplexer implementations have the ability to allocate i/o buffers in special memory shared between the i/o hardware and user space processes. Using registered i/o buffers can entirely eliminate all kernel transitions and memory copying during i/o, and can saturate very high end hardware from a single kernel thread.</p>
<p>If no multiplexer is set, the default implementation uses <code>map_handle</code> to allocate raw memory pages from the OS kernel. If the requested buffer size is a multiple of one of the larger page sizes from <code>utils::page_sizes()</code>, an attempt to satisfy the request using the larger page size will be attempted first. </p>
<div class="fragment"><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  {</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">if</span>(_ctx == <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  {</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <span class="keywordflow">return</span> <a class="code" href="classllfio__v2__xxx_1_1io__handle.html#ad17b8879c355d86174187f198b70baaa">_do_allocate_registered_buffer</a>(bytes);</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  }</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keywordflow">return</span> _ctx-><a class="code" href="classllfio__v2__xxx_1_1io__multiplexer.html#a3e79fd19de80e77c274b93d0d01b2f10">do_io_handle_allocate_registered_buffer</a>(<span class="keyword">this</span>, bytes);</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a6a1044eeb6ab16939e4669bbeb071b32">◆ </a></span>barrier()</h2>
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<td class="memname">virtual <a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a><const_buffers_type> llfio_v2_xxx::io_handle::barrier </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > </td>
<td class="paramname"><em>reqs</em> = <code><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a><const_buffers_type>()</code>, </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26">barrier_kind</a> </td>
<td class="paramname"><em>kind</em> = <code><a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26a2f6648dac37731813bb84ae9b24bdfdb">barrier_kind::nowait_data_only</a></code>, </td>
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<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<p>Issue a write reordering barrier such that writes preceding the barrier will reach storage before writes after this barrier, preferentially using any i/o multiplexer set over the virtually overridable per-class implementation. </p>
<dl class="section warning"><dt>Warning</dt><dd><b>Assume that this call is a no-op</b>. It is not reliably implemented in many common use cases, for example if your code is running inside a LXC container, or if the user has mounted the filing system with non-default options. Instead open the handle with <code>caching::reads</code> which means that all writes form a strict sequential order not completing until acknowledged by the storage device. Filing system can and do use different algorithms to give much better performance with <code>caching::reads</code>, some (e.g. ZFS) spectacularly better.</dd>
<dd>
Let me repeat again: consider this call to be a <b>hint</b> to poke the kernel with a stick to go start to do some work sooner rather than later. <b>It may be ignored entirely</b>.</dd>
<dd>
For portability, you can only assume that barriers write order for a single handle instance. You cannot assume that barriers write order across multiple handles to the same inode, or across processes.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The buffers barriered, which may not be the buffers input. The size of each scatter-gather buffer is updated with the number of bytes of that buffer barriered. </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">reqs</td><td>A scatter-gather and offset request for what range to barrier. May be ignored on some platforms which always write barrier the entire file. Supplying a default initialised reqs write barriers the entire file. </td></tr>
<tr><td class="paramname">kind</td><td>Which kind of write reordering barrier to perform. </td></tr>
<tr><td class="paramname">d</td><td>An optional deadline by which the i/o must complete, else it is cancelled. Note function may return significantly after this deadline if the i/o takes long to cancel. </td></tr>
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</dd>
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<dl class="section user"><dt>Errors returnable\n Any of the values POSIX fdatasync() or Windows NtFlushBuffersFileEx() can return.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n None.</dt><dd></dd></dl>
<div class="fragment"><div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  {</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  <span class="keywordflow">return</span> (_ctx == <span class="keyword">nullptr</span>) ? <a class="code" href="classllfio__v2__xxx_1_1io__handle.html#a0f1d67fa1ad7f0d0b1256b6138929d60">_do_barrier</a>(reqs, kind, d) : _do_multiplexer_barrier({}, std::move(reqs), kind, d);</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#aeea4389189021b94dde6d8f2c3ccc5b3">◆ </a></span>clone()</h2>
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<td class="memname">result<<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a>> llfio_v2_xxx::handle::clone </td>
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<p>Clone this handle (copy constructor is disabled to avoid accidental copying)</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup() or DuplicateHandle() can return.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a359f780e7468407b38978cc5eb7b2555">◆ </a></span>co_barrier()</h2>
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<td class="memname"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1awaitable.html">awaitable</a><<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a><const_buffers_type> > llfio_v2_xxx::io_handle::co_barrier </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > </td>
<td class="paramname"><em>reqs</em> = <code><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a><const_buffers_type>()</code>, </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26">barrier_kind</a> </td>
<td class="paramname"><em>kind</em> = <code><a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html#ace3fed6888ea1b5b6f1f641e2cf7cd26a2f6648dac37731813bb84ae9b24bdfdb">barrier_kind::nowait_data_only</a></code>, </td>
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<td class="paramname"><em>d</em> = <code><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<p>A coroutinised equivalent to <code>.barrier()</code> which suspends the coroutine until the i/o finishes. <b>Blocks execution</b> i.e is equivalent to <code>.barrier()</code> if no i/o multiplexer has been set on this handle! </p>
<p>The awaitable returned is <b>eager</b> i.e. it immediately begins the i/o. If the i/o completes and finishes immediately, no coroutine suspension occurs. </p>
<div class="fragment"><div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  {</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  <span class="keywordflow">if</span>(_ctx == <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  {</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  <span class="keywordflow">return</span> awaitable<io_result<const_buffers_type>>(<a class="code" href="classllfio__v2__xxx_1_1io__handle.html#a6a1044eeb6ab16939e4669bbeb071b32">barrier</a>(std::move(reqs), kind, d));</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  }</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  awaitable<io_result<const_buffers_type>> ret;</div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  ret.set_state(_ctx-><a class="code" href="classllfio__v2__xxx_1_1io__multiplexer.html#a00bf4ea26d854a7e8c9734f357d417f3">construct</a>(ret._state_storage, <span class="keyword">this</span>, <span class="keyword">nullptr</span>, {}, d, std::move(reqs), kind));</div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a30eca672189ffc408a4e01b064e8b78e">◆ </a></span>co_read()</h2>
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<td>(</td>
<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< buffers_type > </td>
<td class="paramname"><em>reqs</em>, </td>
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<td class="paramname"><em>d</em> = <code><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<p>A coroutinised equivalent to <code>.read()</code> which suspends the coroutine until the i/o finishes. <b>Blocks execution</b> i.e is equivalent to <code>.read()</code> if no i/o multiplexer has been set on this handle! </p>
<p>The awaitable returned is <b>eager</b> i.e. it immediately begins the i/o. If the i/o completes and finishes immediately, no coroutine suspension occurs. </p>
<div class="fragment"><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  {</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="keywordflow">if</span>(_ctx == <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  {</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="keywordflow">return</span> awaitable<io_result<buffers_type>>(<a class="code" href="classllfio__v2__xxx_1_1io__handle.html#ae04ada27942187f03b59044cd1328f49">read</a>(std::move(reqs), d));</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  }</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  awaitable<io_result<buffers_type>> ret;</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  ret.set_state(_ctx-><a class="code" href="classllfio__v2__xxx_1_1io__multiplexer.html#a00bf4ea26d854a7e8c9734f357d417f3">construct</a>(ret._state_storage, <span class="keyword">this</span>, <span class="keyword">nullptr</span>, {}, d, std::move(reqs)));</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a608634d1664d2a43fbdc2e18cae464ee">◆ </a></span>co_write()</h2>
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<td class="memname"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1awaitable.html">awaitable</a><<a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a><const_buffers_type> > llfio_v2_xxx::io_handle::co_write </td>
<td>(</td>
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<td class="paramname"><em>reqs</em>, </td>
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<p>A coroutinised equivalent to <code>.write()</code> which suspends the coroutine until the i/o finishes. <b>Blocks execution</b> i.e is equivalent to <code>.write()</code> if no i/o multiplexer has been set on this handle! </p>
<p>The awaitable returned is <b>eager</b> i.e. it immediately begins the i/o. If the i/o completes and finishes immediately, no coroutine suspension occurs. </p>
<div class="fragment"><div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  {</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  <span class="keywordflow">if</span>(_ctx == <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  {</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  <span class="keywordflow">return</span> awaitable<io_result<const_buffers_type>>(<a class="code" href="classllfio__v2__xxx_1_1io__handle.html#a7848ef15e774eacec7e4446a8c365a3d">write</a>(std::move(reqs), d));</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  }</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  awaitable<io_result<const_buffers_type>> ret;</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  ret.set_state(_ctx-><a class="code" href="classllfio__v2__xxx_1_1io__multiplexer.html#a00bf4ea26d854a7e8c9734f357d417f3">construct</a>(ret._state_storage, <span class="keyword">this</span>, <span class="keyword">nullptr</span>, {}, d, std::move(reqs)));</div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a00a85eec5a41f7edb2c574d40cf04535">◆ </a></span>current_path()</h2>
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<td class="memname">virtual result<<a class="el" href="classllfio__v2__xxx_1_1handle.html#a33481bae57d9ccd0c97946416f9682f3">path_type</a>> llfio_v2_xxx::handle::current_path </td>
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<p>Returns the current path of the open handle as said by the operating system. Note that you are NOT guaranteed that any path refreshed bears any resemblance to the original, some operating systems will return some different path which still reaches the same inode via some other route e.g. hardlinks, dereferenced symbolic links, etc. Windows and Linux correctly track changes to the specific path the handle was opened with, not getting confused by other hard links. MacOS nearly gets it right, but under some circumstances e.g. renaming may switch to a different hard link's path which is almost certainly a bug.</p>
<p>If LLFIO was not able to determine the current path for this open handle e.g. the inode has been unlinked, it returns an empty path. Be aware that FreeBSD can return an empty (deleted) path for file inodes no longer cached by the kernel path cache, LLFIO cannot detect the difference. FreeBSD will also return any path leading to the inode if it is hard linked. FreeBSD does implement path retrieval for directory inodes correctly however, and see <code>algorithm::cached_parent_handle_adapter<T></code> for a handle adapter which makes use of that.</p>
<p>On Linux if <code>/proc</code> is not mounted, this call fails with an error. All APIs in LLFIO which require the use of <code>current_path()</code> can be told to not use it e.g. <code>flag::disable_safety_unlinks</code>. It is up to you to detect if <code>current_path()</code> is not working, and to change how you call LLFIO appropriately.</p>
<p>On Windows, you will almost certainly get back a path of the form <code>\!!\Device\HarddiskVolume10\Users\ned\...</code>. See <code>path_view</code> for what all the path prefix sequences mean, but to summarise the <code>\!!\</code> prefix is LLFIO-only and will not be accepted by other Windows APIs. Pass LLFIO derived paths through the function <code>to_win32_path()</code> to Win32-ise them. This function is also available on Linux where it does nothing, so you can use it in portable code.</p>
<dl class="section warning"><dt>Warning</dt><dd>This call is expensive, it always asks the kernel for the current path, and no checking is done to ensure what the kernel returns is accurate or even sensible. Be aware that despite these precautions, paths are unstable and <b>can change randomly at any moment</b>. Most code written to use absolute file systems paths is <b>racy</b>, so don't do it, use <code>path_handle</code> to fix a base location on the file system and work from that anchor instead!</dd></dl>
<dl class="section user"><dt>Memory Allocations\n At least one malloc for the path_type, likely several more.</dt><dd></dd></dl>
<dl class="section see"><dt>See also</dt><dd><code>algorithm::cached_parent_handle_adapter<T></code> which overrides this with an implementation based on retrieving the current path of a cached handle to the parent directory. On platforms with instability or failure to retrieve the correct current path for regular files, the cached parent handle adapter works around the problem by taking advantage of directory inodes not having the same instability problems on any platform. </dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1symlink__handle.html#aea44ed050acfd8e4f9dec59ff194c746">llfio_v2_xxx::symlink_handle</a>, and <a class="el" href="classllfio__v2__xxx_1_1process__handle.html#a8ed1f5dda9dcf9d59710acc9c91df943">llfio_v2_xxx::process_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a469019e3bbcd7b37499b8604af713b40">◆ </a></span>lock_file()</h2>
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<td class="memname">virtual result<void> llfio_v2_xxx::lockable_io_handle::lock_file </td>
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<p>Locks the inode referred to by the open handle for exclusive access. </p>
<p>Note that this may, or may not, interact with the byte range lock extensions. See <code>unique_file_lock</code> for a RAII locker. </p><dl class="section user"><dt>Errors returnable\n Any of the values POSIX flock() can return.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n The default synchronous implementation in file_handle performs no memory allocation.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a0ece4f0a48e1e67debc438a9742a1f4c">◆ </a></span>lock_file_range()</h2>
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<td class="memname">virtual result<<a class="el" href="classllfio__v2__xxx_1_1lockable__io__handle_1_1extent__guard.html">extent_guard</a>> llfio_v2_xxx::lockable_io_handle::lock_file_range </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> </td>
<td class="paramname"><em>offset</em>, </td>
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<td class="paramname"><em>bytes</em>, </td>
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<td class="paramname"><em>kind</em>, </td>
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<td class="paramname"><em>d</em> = <code><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<p>EXTENSION: Tries to lock the range of bytes specified for shared or exclusive access. Note that this may, or MAY NOT, observe whole file locks placed with <code>lock()</code>, <code>lock_shared()</code> etc. </p>
<p>Be aware this passes through the same semantics as the underlying OS call, including any POSIX insanity present on your platform:</p>
<ul>
<li>Any fd closed on an inode must release all byte range locks on that inode for all other fds. If your OS isn't new enough to support the non-insane lock API, <code>flag::byte_lock_insanity</code> will be set in flags() after the first call to this function.</li>
<li>Threads replace each other's locks, indeed locks replace each other's locks.</li>
</ul>
<p>You almost cetainly should use your choice of an <code>algorithm::shared_fs_mutex::*</code> instead of this as those are more portable and performant, or use the <code>SharedMutex</code> modelling member functions which lock the whole inode for exclusive or shared access.</p>
<dl class="section warning"><dt>Warning</dt><dd>This is a low-level API which you should not use directly in portable code. Another issue is that atomic lock upgrade/downgrade, if your platform implements that (you should assume it does not in portable code), means that on POSIX you need to <em>release</em> the old <code>extent_guard</code> after creating a new one over the same byte range, otherwise the old <code>extent_guard</code>'s destructor will simply unlock the range entirely. On Windows however upgrade/downgrade locks overlay, so on that platform you must <em>not</em> release the old <code>extent_guard</code>. Look into <code>algorithm::shared_fs_mutex::safe_byte_ranges</code> for a portable solution.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>An extent guard, the destruction of which will call unlock(). </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">offset</td><td>The offset to lock. Note that on POSIX the top bit is always cleared before use as POSIX uses signed transport for offsets. If you want an advisory rather than mandatory lock on Windows, one technique is to force top bit set so the region you lock is not the one you will i/o - obviously this reduces maximum file size to (2^63)-1. </td></tr>
<tr><td class="paramname">bytes</td><td>The number of bytes to lock. Setting this and the offset to zero causes the whole file to be locked. </td></tr>
<tr><td class="paramname">kind</td><td>Whether the lock is to be shared or exclusive. </td></tr>
<tr><td class="paramname">d</td><td>An optional deadline by which the lock must complete, else it is cancelled. </td></tr>
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<dl class="section user"><dt>Errors returnable\n Any of the values POSIX fcntl() can return, errc::timed_out, errc::not_supported may be</dt><dd>returned if deadline i/o is not possible with this particular handle configuration (e.g. non-overlapped HANDLE on Windows). </dd></dl>
<dl class="section user"><dt>Memory Allocations\n The default synchronous implementation in file_handle performs no memory allocation.</dt><dd></dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1fast__random__file__handle.html#a6bba3f508224b7412f2fb3c050ca9711">llfio_v2_xxx::fast_random_file_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa24a432125e5b51b13f21d9b74fa4721">◆ </a></span>lock_file_shared()</h2>
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<td class="memname">virtual result<void> llfio_v2_xxx::lockable_io_handle::lock_file_shared </td>
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<p>Locks the inode referred to by the open handle for shared access. </p>
<p>Note that this may, or may not, interact with the byte range lock extensions. See <code>unique_file_lock</code> for a RAII locker. </p><dl class="section user"><dt>Errors returnable\n Any of the values POSIX flock() can return.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n The default synchronous implementation in file_handle performs no memory allocation.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#aa3465a87f2c732cd6465cd3a832a26f0">◆ </a></span>max_buffers()</h2>
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<td class="memname">size_t llfio_v2_xxx::io_handle::max_buffers </td>
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<p>The <em>maximum</em> number of buffers which a single read or write syscall can (atomically) process at a time for this specific open handle. On POSIX, this is known as <code>IOV_MAX</code>. Preferentially uses any i/o multiplexer set over the virtually overridable per-class implementation. </p>
<p>Note that the actual number of buffers accepted for a read or a write may be significantly lower than this system-defined limit, depending on available resources. The <code>read()</code> or <code>write()</code> call will return the buffers accepted at the time of invoking the syscall.</p>
<p>Note also that some OSs will error out if you supply more than this limit to <code>read()</code> or <code>write()</code>, but other OSs do not. Some OSs guarantee that each i/o syscall has effects atomically visible or not to other i/o, other OSs do not.</p>
<p>OS X does not implement scatter-gather file i/o syscalls. Thus this function will always return <code>1</code> in that situation.</p>
<p>Microsoft Windows <em>may</em> implement scatter-gather i/o under certain handle configurations. Most of the time for non-socket handles this function will return <code>1</code>.</p>
<p>For handles which implement i/o entirely in user space, and thus syscalls are not involved, this function will return <code>0</code>. </p>
<div class="fragment"><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  {</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordflow">if</span>(_ctx == <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  {</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keywordflow">return</span> <a class="code" href="classllfio__v2__xxx_1_1io__handle.html#ae5ec845b3e2c2e31c2dc3de1d276a7e3">_do_max_buffers</a>();</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  }</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <span class="keywordflow">return</span> _ctx-><a class="code" href="classllfio__v2__xxx_1_1io__multiplexer.html#a1cc4f56ad15d1bed49d68c56a278ad0c">do_io_handle_max_buffers</a>(<span class="keyword">this</span>);</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ac5222904f116c9beb0515a4a5aa850bf">◆ </a></span>QUICKCPPLIB_BITFIELD_BEGIN()</h2>
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<td class="memname">llfio_v2_xxx::handle::QUICKCPPLIB_BITFIELD_BEGIN </td>
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<p>Bitwise flags which can be specified. </p>
<p>< No flags</p>
<p>Unlinks the file on handle close. On POSIX, this simply unlinks whatever is pointed to by <code>path()</code> upon the call of <code>close()</code> if and only if the inode matches. On Windows, if you are on Windows 10 1709 or later, exactly the same thing occurs. If on previous editions of Windows, the file entry does not disappears but becomes unavailable for anyone else to open with an <code>errc::resource_unavailable_try_again</code> error return. Because this is confusing, unless the <code>win_disable_unlink_emulation</code> flag is also specified, this POSIX behaviour is somewhat emulated by LLFIO on older Windows by renaming the file to a random name on <code>close()</code> causing it to appear to have been unlinked immediately.</p>
<p>Some kernel caching modes have unhelpfully inconsistent behaviours in getting your data onto storage, so by default unless this flag is specified LLFIO adds extra fsyncs to the following operations for the caching modes specified below: truncation of file length either explicitly or during file open. closing of the handle either explicitly or in the destructor.</p>
<p>Additionally on Linux only to prevent loss of file metadata: On the parent directory whenever a file might have been created. On the parent directory on file close.</p>
<p>This only occurs for these kernel caching modes: caching::none caching::reads caching::reads_and_metadata caching::safety_barriers</p>
<p><code>file_handle::unlink()</code> could accidentally delete the wrong file if someone has renamed the open file handle since the time it was opened. To prevent this occuring, where the OS doesn't provide race free unlink-by-open-handle we compare the inode of the path we are about to unlink with that of the open handle before unlinking. </p><dl class="section warning"><dt>Warning</dt><dd>This does not prevent races where in between the time of checking the inode and executing the unlink a third party changes the item about to be unlinked. Only operating systems with a true race-free unlink syscall are race free.</dd></dl>
<p>Ask the OS to disable prefetching of data. This can improve random i/o performance.</p>
<p>Ask the OS to maximise prefetching of data, possibly prefetching the entire file into kernel cache. This can improve sequential i/o performance.</p>
<p>< See the documentation for <code>unlink_on_first_close</code></p>
<p>Microsoft Windows NTFS, having been created in the late 1980s, did not originally implement extents-based storage and thus could only represent sparse files via efficient compression of intermediate zeros. With NTFS v3.0 (Microsoft Windows 2000), a proper extents-based on-storage representation was added, thus allowing only 64Kb extent chunks written to be stored irrespective of whatever the maximum file extent was set to.</p>
<p>For various historical reasons, extents-based storage is disabled by default in newly created files on NTFS, unlike in almost every other major filing system. You have to explicitly "opt in" to extents-based storage.</p>
<p>As extents-based storage is nearly cost free on NTFS, LLFIO by default opts in to extents-based storage for any empty file it creates. If you don't want this, you can specify this flag to prevent that happening.</p>
<p>Filesystems tend to be embarrassingly parallel for operations performed to different inodes. Where LLFIO performs i/o to multiple inodes at a time, it will use OpenMP or the Parallelism or Concurrency standard library extensions to usually complete the operation in constant rather than linear time. If you don't want this default, you can disable default using this flag.</p>
<p>Microsoft Windows NTFS has the option, when creating a directory, to set whether leafname lookup will be case sensitive. This is the only way of getting exact POSIX semantics on Windows without resorting to editing the system registry, however it also affects all code doing lookups within that directory, so we must default it to off.</p>
<p>Create the handle in a way where i/o upon it can be multiplexed with other i/o on the same initiating thread of execution i.e. you can perform more than one read concurrently, without using threads. The blocking operations <code>.read()</code> and <code>.write()</code> may have to use a less efficient, but cancellable, blocking implementation for handles created in this way. On Microsoft Windows, this creates handles with <code>OVERLAPPED</code> semantics. On POSIX, this creates handles with nonblocking semantics for non-file handles such as pipes and sockets, however for file, directory and symlink handles it does not set nonblocking, as it is non-portable.</p>
<p>< Using insane POSIX byte range locks</p>
<p>< This is an inode created with no representation on the filing system</p>
<div class="fragment"><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  {</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  none = 0, <span class="comment">//!< No flags</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"></span><span class="comment"> /*! Unlinks the file on handle close. On POSIX, this simply unlinks whatever is pointed</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> to by `path()` upon the call of `close()` if and only if the inode matches. On Windows,</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> if you are on Windows 10 1709 or later, exactly the same thing occurs. If on previous</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> editions of Windows, the file entry does not disappears but becomes unavailable for</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> anyone else to open with an `errc::resource_unavailable_try_again` error return. Because this is confusing, unless the</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> `win_disable_unlink_emulation` flag is also specified, this POSIX behaviour is</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> somewhat emulated by LLFIO on older Windows by renaming the file to a random name on `close()`</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> causing it to appear to have been unlinked immediately.</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  unlink_on_first_close = 1U << 0U,</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"></span> </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> /*! Some kernel caching modes have unhelpfully inconsistent behaviours</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> in getting your data onto storage, so by default unless this flag is</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> specified LLFIO adds extra fsyncs to the following operations for the</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> caching modes specified below:</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * truncation of file length either explicitly or during file open.</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * closing of the handle either explicitly or in the destructor.</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"></span> </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> Additionally on Linux only to prevent loss of file metadata:</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * On the parent directory whenever a file might have been created.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * On the parent directory on file close.</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"></span> </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> This only occurs for these kernel caching modes:</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> * caching::none</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"> * caching::reads</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> * caching::reads_and_metadata</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> * caching::safety_barriers</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  disable_safety_barriers = 1U << 2U,<span class="comment"></span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> /*! `file_handle::unlink()` could accidentally delete the wrong file if someone has</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> renamed the open file handle since the time it was opened. To prevent this occuring,</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> where the OS doesn't provide race free unlink-by-open-handle we compare the inode of</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> the path we are about to unlink with that of the open handle before unlinking.</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> \warning This does not prevent races where in between the time of checking the inode</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> and executing the unlink a third party changes the item about to be unlinked. Only</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> operating systems with a true race-free unlink syscall are race free.</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  disable_safety_unlinks = 1U << 3U,<span class="comment"></span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> /*! Ask the OS to disable prefetching of data. This can improve random</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> i/o performance.</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  disable_prefetching = 1U << 4U,<span class="comment"></span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> /*! Ask the OS to maximise prefetching of data, possibly prefetching the entire file</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> into kernel cache. This can improve sequential i/o performance.</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  maximum_prefetching = 1U << 5U,</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  win_disable_unlink_emulation = 1U << 24U, <span class="comment">//!< See the documentation for `unlink_on_first_close`</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"></span><span class="comment"> /*! Microsoft Windows NTFS, having been created in the late 1980s, did not originally</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> implement extents-based storage and thus could only represent sparse files via</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"> efficient compression of intermediate zeros. With NTFS v3.0 (Microsoft Windows 2000),</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> a proper extents-based on-storage representation was added, thus allowing only 64Kb</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"> extent chunks written to be stored irrespective of whatever the maximum file extent</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> was set to.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"></span> </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> For various historical reasons, extents-based storage is disabled by default in newly</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> created files on NTFS, unlike in almost every other major filing system. You have to</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"> explicitly "opt in" to extents-based storage.</span></div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"></span> </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment"> As extents-based storage is nearly cost free on NTFS, LLFIO by default opts in to</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> extents-based storage for any empty file it creates. If you don't want this, you</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"> can specify this flag to prevent that happening.</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  win_disable_sparse_file_creation = 1U << 25U,<span class="comment"></span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> /*! Filesystems tend to be embarrassingly parallel for operations performed to different</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"> inodes. Where LLFIO performs i/o to multiple inodes at a time, it will use OpenMP or</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span> <span class="comment"> the Parallelism or Concurrency standard library extensions to usually complete the</span></div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="comment"> operation in constant rather than linear time. If you don't want this default, you can</span></div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> <span class="comment"> disable default using this flag.</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  disable_parallelism = 1U << 26U,<span class="comment"></span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="comment"> /*! Microsoft Windows NTFS has the option, when creating a directory, to set whether</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment"> leafname lookup will be case sensitive. This is the only way of getting exact POSIX</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> semantics on Windows without resorting to editing the system registry, however it also</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"> affects all code doing lookups within that directory, so we must default it to off.</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  win_create_case_sensitive_directory = 1U << 27U,</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment"></span> </div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> /*! Create the handle in a way where i/o upon it can be multiplexed with other i/o</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment"> on the same initiating thread of execution i.e. you can perform more than one read</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span> <span class="comment"> concurrently, without using threads. The blocking operations `.read()` and `.write()`</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment"> may have to use a less efficient, but cancellable, blocking implementation for handles created</span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> in this way. On Microsoft Windows, this creates handles with `OVERLAPPED` semantics.</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="comment"> On POSIX, this creates handles with nonblocking semantics for non-file handles such</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"> as pipes and sockets, however for file, directory and symlink handles it does not set</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> nonblocking, as it is non-portable.</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  multiplexable = 1U << 28U,</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  </div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  </div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  byte_lock_insanity = 1U << 29U, <span class="comment">//!< Using insane POSIX byte range locks</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"></span> anonymous_inode = 1U << 30U <span class="comment">//!< This is an inode created with no representation on the filing system</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"></span> } QUICKCPPLIB_BITFIELD_END(flag);</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ae04ada27942187f03b59044cd1328f49">◆ </a></span>read()</h2>
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<td class="memname"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a><buffers_type> llfio_v2_xxx::io_handle::read </td>
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<td class="paramname"><em>reqs</em>, </td>
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<td class="paramname"><em>d</em> = <code><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<p>Read data from the open handle, preferentially using any i/o multiplexer set over the virtually overridable per-class implementation. </p>
<dl class="section warning"><dt>Warning</dt><dd>Depending on the implementation backend, <b>very</b> different buffers may be returned than you supplied. You should <b>always</b> use the buffers returned and assume that they point to different memory and that each buffer's size will have changed.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The buffers read, which may not be the buffers input. The size of each scatter-gather buffer returned is updated with the number of bytes of that buffer transferred, and the pointer to the data may be <em>completely</em> different to what was submitted (e.g. it may point into a memory map). </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">reqs</td><td>A scatter-gather and offset request. </td></tr>
<tr><td class="paramname">d</td><td>An optional deadline by which the i/o must complete, else it is cancelled. Note function may return significantly after this deadline if the i/o takes long to cancel. </td></tr>
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</dd>
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<dl class="section user"><dt>Errors returnable\n Any of the values POSIX read() can return, errc::timed_out, errc::operation_canceled. errc::not_supported may be</dt><dd>returned if deadline i/o is not possible with this particular handle configuration (e.g. reading from regular files on POSIX or reading from a non-overlapped HANDLE on Windows). </dd></dl>
<dl class="section user"><dt>Memory Allocations\n The default synchronous implementation in file_handle performs no memory allocation.</dt><dd></dd></dl>
<div class="fragment"><div class="line"><a name="l00283"></a><span class="lineno"> 283</span> { <span class="keywordflow">return</span> (_ctx == <span class="keyword">nullptr</span>) ? <a class="code" href="classllfio__v2__xxx_1_1io__handle.html#a4379e3f84b913f606bb2ec6a194d4380">_do_read</a>(reqs, d) : _do_multiplexer_read({}, reqs, d); }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a101620e9fff0c0e8c346af0e9de58b6a">◆ </a></span>set_append_only()</h2>
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<td class="memname">virtual result<void> llfio_v2_xxx::handle::set_append_only </td>
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<p>EXTENSION: Changes whether this handle is append only or not. </p>
<dl class="section warning"><dt>Warning</dt><dd>On Windows this is implemented as a bit of a hack to make it fast like on POSIX, so make sure you open the handle for read/write originally. Note unlike on POSIX the append_only disposition will be the only one toggled, seekable and readable will remain turned on.</dd></dl>
<dl class="section user"><dt>Errors returnable\n Whatever POSIX fcntl() returns. On Windows nothing is changed on the handle.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n No memory allocation.</dt><dd></dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1process__handle.html#ab64c9fc14fc555b5ec8571863458bf83">llfio_v2_xxx::process_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a281467f83f70f2e12aaedf5847fd818c">◆ </a></span>set_multiplexer()</h2>
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<td class="memname">result< void > llfio_v2_xxx::io_handle::set_multiplexer </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1io__multiplexer.html">io_multiplexer</a> * </td>
<td class="paramname"><em>c</em> = <code><a class="el" href="namespacellfio__v2__xxx_1_1this__thread.html#afd6a1f179a8f8027f6c051badadf2707">this_thread::multiplexer</a>()</code></td><td>)</td>
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<p>Sets the i/o multiplexer this handle will use to implement <code>read()</code>, <code>write()</code> and <code>barrier()</code>. </p>
<p>Note that this call deregisters this handle from any existing i/o multiplexer, and registers it with the new i/o multiplexer. You must therefore not call it if any i/o is currently outstanding on this handle. You should also be aware that multiple dynamic memory allocations and deallocations may occur, as well as multiple syscalls (i.e. this is an expensive call, try to do it from cold code).</p>
<p>If the handle was not created as multiplexable, this call always fails.</p>
<dl class="section user"><dt>Memory Allocations\n Multiple dynamic memory allocations and deallocations.</dt><dd></dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1mapped__file__handle.html#ac9a87793288b496940bdae0ff07cae0c">llfio_v2_xxx::mapped_file_handle</a>.</p>
<div class="fragment"><div class="line"><a name="l00473"></a><span class="lineno"> 473</span> {</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  <span class="keywordflow">if</span>(!<a class="code" href="classllfio__v2__xxx_1_1handle.html#ade2416b9154d1e56937c99cd514324f8">is_multiplexable</a>())</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  {</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  <span class="keywordflow">return</span> errc::operation_not_supported;</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  }</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  <span class="keywordflow">if</span>(c == _ctx)</div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  {</div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  <span class="keywordflow">return</span> success();</div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  }</div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  <span class="keywordflow">if</span>(_ctx != <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  {</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  OUTCOME_TRY(_ctx-><a class="code" href="classllfio__v2__xxx_1_1io__multiplexer.html#a7c9d163a9e1ca06acbce1f135cfef087">do_io_handle_deregister</a>(<span class="keyword">this</span>));</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  _ctx = <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  }</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  <span class="keywordflow">if</span>(c != <span class="keyword">nullptr</span>)</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  {</div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  OUTCOME_TRY(<span class="keyword">auto</span> &&state, c->do_io_handle_register(<span class="keyword">this</span>));</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  _v.behaviour = (_v.behaviour & ~(native_handle_type::disposition::_multiplexer_state_bit0 | native_handle_type::disposition::_multiplexer_state_bit1));</div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span>  <span class="keywordflow">if</span>((state & 1) != 0)</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  {</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  _v.behaviour |= native_handle_type::disposition::_multiplexer_state_bit0;</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  }</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <span class="keywordflow">if</span>((state & 2) != 0)</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  {</div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  _v.behaviour |= native_handle_type::disposition::_multiplexer_state_bit1;</div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  }</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  }</div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  _ctx = c;</div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  <span class="keywordflow">return</span> success();</div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span> }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a6e6a25ad5d9efd45e69d22e70a754a9e">◆ </a></span>try_lock_file()</h2>
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<td class="memname">virtual bool llfio_v2_xxx::lockable_io_handle::try_lock_file </td>
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<p>Tries to lock the inode referred to by the open handle for exclusive access, returning <code>false</code> if lock is currently unavailable. </p>
<p>Note that this may, or may not, interact with the byte range lock extensions. See <code>unique_file_lock</code> for a RAII locker. </p><dl class="section user"><dt>Errors returnable\n Any of the values POSIX flock() can return.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n The default synchronous implementation in file_handle performs no memory allocation.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ad8e3d809cb954d99e228ee756bac1c64">◆ </a></span>try_lock_file_shared()</h2>
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<p>Tries to lock the inode referred to by the open handle for shared access, returning <code>false</code> if lock is currently unavailable. </p>
<p>Note that this may, or may not, interact with the byte range lock extensions. See <code>unique_file_lock</code> for a RAII locker. </p><dl class="section user"><dt>Errors returnable\n Any of the values POSIX flock() can return.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n The default synchronous implementation in file_handle performs no memory allocation.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a5572735777dfdd3f7c5c1f6dc8260287">◆ </a></span>unlock_file_range()</h2>
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<td class="memname">virtual void llfio_v2_xxx::lockable_io_handle::unlock_file_range </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> </td>
<td class="paramname"><em>offset</em>, </td>
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<td class="paramname"><em>bytes</em> </td>
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<p>EXTENSION: Unlocks a byte range previously locked. </p>
<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">offset</td><td>The offset to unlock. This should be an offset previously locked. </td></tr>
<tr><td class="paramname">bytes</td><td>The number of bytes to unlock. This should be a byte extent previously locked. </td></tr>
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<dl class="section user"><dt>Errors returnable\n Any of the values POSIX fcntl() can return.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n None.</dt><dd></dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1fast__random__file__handle.html#a7830dff75463d4e0bf8d871bdc75055d">llfio_v2_xxx::fast_random_file_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a7848ef15e774eacec7e4446a8c365a3d">◆ </a></span>write()</h2>
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<td class="memname"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__result.html">io_result</a><const_buffers_type> llfio_v2_xxx::io_handle::write </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1io__multiplexer_1_1io__request.html">io_request</a>< const_buffers_type > </td>
<td class="paramname"><em>reqs</em>, </td>
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<td class="paramtype"><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structllfio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">noexcept</span><span class="mlabel">inherited</span></span> </td>
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<p>Write data to the open handle, preferentially using any i/o multiplexer set over the virtually overridable per-class implementation. </p>
<dl class="section warning"><dt>Warning</dt><dd>Depending on the implementation backend, not all of the buffers input may be written. For example, with a zeroed deadline, some backends may only consume as many buffers as the system has available write slots for, thus for those backends this call is "non-blocking" in the sense that it will return immediately even if it could not schedule a single buffer write. Another example is that some implementations will not auto-extend the length of a file when a write exceeds the maximum extent, you will need to issue a <code>truncate(newsize)</code> first.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The buffers written, which may not be the buffers input. The size of each scatter-gather buffer returned is updated with the number of bytes of that buffer transferred. </dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">reqs</td><td>A scatter-gather and offset request. </td></tr>
<tr><td class="paramname">d</td><td>An optional deadline by which the i/o must complete, else it is cancelled. Note function may return significantly after this deadline if the i/o takes long to cancel. </td></tr>
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<dl class="section user"><dt>Errors returnable\n Any of the values POSIX write() can return, errc::timed_out, errc::operation_canceled. errc::not_supported may be</dt><dd>returned if deadline i/o is not possible with this particular handle configuration (e.g. writing to regular files on POSIX or writing to a non-overlapped HANDLE on Windows). </dd></dl>
<dl class="section user"><dt>Memory Allocations\n The default synchronous implementation in file_handle performs no memory allocation.</dt><dd></dd></dl>
<div class="fragment"><div class="line"><a name="l00325"></a><span class="lineno"> 325</span> { <span class="keywordflow">return</span> (_ctx == <span class="keyword">nullptr</span>) ? <a class="code" href="classllfio__v2__xxx_1_1io__handle.html#a2102f73a4872e8fd8bbe1c71ef82c97f">_do_write</a>(reqs, d) : _do_multiplexer_write({}, std::move(reqs), d); }</div>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/llfio/v2.0/<a class="el" href="lockable__io__handle_8hpp.html">lockable_io_handle.hpp</a></li>
</ul>
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<div class="ttc" id="aclassllfio__v2__xxx_1_1io__handle_html_a7848ef15e774eacec7e4446a8c365a3d"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__handle.html#a7848ef15e774eacec7e4446a8c365a3d">llfio_v2_xxx::io_handle::write</a></div><div class="ttdeci">io_result< const_buffers_type > write(io_request< const_buffers_type > reqs, deadline d=deadline()) noexcept</div><div class="ttdoc">Write data to the open handle, preferentially using any i/o multiplexer set over the virtually overri...</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:325</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__handle_html_a6a1044eeb6ab16939e4669bbeb071b32"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__handle.html#a6a1044eeb6ab16939e4669bbeb071b32">llfio_v2_xxx::io_handle::barrier</a></div><div class="ttdeci">virtual io_result< const_buffers_type > barrier(io_request< const_buffers_type > reqs=io_request< const_buffers_type >(), barrier_kind kind=barrier_kind::nowait_data_only, deadline d=deadline()) noexcept</div><div class="ttdoc">Issue a write reordering barrier such that writes preceding the barrier will reach storage before wri...</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:376</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__handle_html_ad17b8879c355d86174187f198b70baaa"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__handle.html#ad17b8879c355d86174187f198b70baaa">llfio_v2_xxx::io_handle::_do_allocate_registered_buffer</a></div><div class="ttdeci">virtual result< registered_buffer_type > _do_allocate_registered_buffer(size_t &bytes) noexcept</div><div class="ttdoc">The virtualised implementation of allocate_registered_buffer() used if no multiplexer has been set.</div><div class="ttdef"><b>Definition:</b> map_handle.hpp:881</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__handle_html_a4379e3f84b913f606bb2ec6a194d4380"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__handle.html#a4379e3f84b913f606bb2ec6a194d4380">llfio_v2_xxx::io_handle::_do_read</a></div><div class="ttdeci">virtual io_result< buffers_type > _do_read(io_request< buffers_type > reqs, deadline d) noexcept</div><div class="ttdoc">The virtualised implementation of read() used if no multiplexer has been set.</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__multiplexer_html_a00bf4ea26d854a7e8c9734f357d417f3"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__multiplexer.html#a00bf4ea26d854a7e8c9734f357d417f3">llfio_v2_xxx::io_multiplexer::construct</a></div><div class="ttdeci">virtual io_operation_state * construct(span< byte > storage, io_handle *_h, io_operation_state_visitor *_visitor, registered_buffer_type &&b, deadline d, io_request< buffers_type > reqs) noexcept=0</div><div class="ttdoc">Constructs either a unsynchronised_io_operation_state or a synchronised_io_operation_state for a read...</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__multiplexer_html_a1cc4f56ad15d1bed49d68c56a278ad0c"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__multiplexer.html#a1cc4f56ad15d1bed49d68c56a278ad0c">llfio_v2_xxx::io_multiplexer::do_io_handle_max_buffers</a></div><div class="ttdeci">virtual size_t do_io_handle_max_buffers(const io_handle *h) const noexcept</div><div class="ttdoc">Implements io_handle::max_buffers()</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:504</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__multiplexer_html_a3e79fd19de80e77c274b93d0d01b2f10"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__multiplexer.html#a3e79fd19de80e77c274b93d0d01b2f10">llfio_v2_xxx::io_multiplexer::do_io_handle_allocate_registered_buffer</a></div><div class="ttdeci">virtual result< registered_buffer_type > do_io_handle_allocate_registered_buffer(io_handle *h, size_t &bytes) noexcept</div><div class="ttdoc">Implements io_handle::allocate_registered_buffer()</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:508</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__multiplexer_html_a7c9d163a9e1ca06acbce1f135cfef087"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__multiplexer.html#a7c9d163a9e1ca06acbce1f135cfef087">llfio_v2_xxx::io_multiplexer::do_io_handle_deregister</a></div><div class="ttdeci">virtual result< void > do_io_handle_deregister(io_handle *) noexcept</div><div class="ttdoc">Implements io_handle deregistration.</div><div class="ttdef"><b>Definition:</b> io_multiplexer.hpp:476</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__handle_html_ae04ada27942187f03b59044cd1328f49"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__handle.html#ae04ada27942187f03b59044cd1328f49">llfio_v2_xxx::io_handle::read</a></div><div class="ttdeci">io_result< buffers_type > read(io_request< buffers_type > reqs, deadline d=deadline()) noexcept</div><div class="ttdoc">Read data from the open handle, preferentially using any i/o multiplexer set over the virtually overr...</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:283</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__handle_html_ae5ec845b3e2c2e31c2dc3de1d276a7e3"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__handle.html#ae5ec845b3e2c2e31c2dc3de1d276a7e3">llfio_v2_xxx::io_handle::_do_max_buffers</a></div><div class="ttdeci">virtual size_t _do_max_buffers() const noexcept</div><div class="ttdoc">The virtualised implementation of max_buffers() used if no multiplexer has been set.</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1handle_html_ade2416b9154d1e56937c99cd514324f8"><div class="ttname"><a href="classllfio__v2__xxx_1_1handle.html#ade2416b9154d1e56937c99cd514324f8">llfio_v2_xxx::handle::is_multiplexable</a></div><div class="ttdeci">bool is_multiplexable() const noexcept</div><div class="ttdoc">True if multiplexable.</div><div class="ttdef"><b>Definition:</b> handle.hpp:358</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__handle_html_a0f1d67fa1ad7f0d0b1256b6138929d60"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__handle.html#a0f1d67fa1ad7f0d0b1256b6138929d60">llfio_v2_xxx::io_handle::_do_barrier</a></div><div class="ttdeci">virtual io_result< const_buffers_type > _do_barrier(io_request< const_buffers_type > reqs, barrier_kind kind, deadline d) noexcept</div><div class="ttdoc">The virtualised implementation of barrier() used if no multiplexer has been set.</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1io__handle_html_a2102f73a4872e8fd8bbe1c71ef82c97f"><div class="ttname"><a href="classllfio__v2__xxx_1_1io__handle.html#a2102f73a4872e8fd8bbe1c71ef82c97f">llfio_v2_xxx::io_handle::_do_write</a></div><div class="ttdeci">virtual io_result< const_buffers_type > _do_write(io_request< const_buffers_type > reqs, deadline d) noexcept</div><div class="ttdoc">The virtualised implementation of write() used if no multiplexer has been set.</div></div>
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