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<p>A handle to a memory mapped region of memory.
<a href="classafio__v2__xxx_1_1map__handle.html#details">More...</a></p>
<p><code>#include "map_handle.hpp"</code></p>
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Inheritance diagram for afio_v2_xxx::map_handle:</div>
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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:a9cde0ddea1310cdec3db32ad69f29527"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a9cde0ddea1310cdec3db32ad69f29527"></a>
using </td><td class="memItemRight" valign="bottom"><b>extent_type</b> = io_handle::extent_type</td></tr>
<tr class="separator:a9cde0ddea1310cdec3db32ad69f29527"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a26d90317426d6a95abb27caff26d1568"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a26d90317426d6a95abb27caff26d1568"></a>
using </td><td class="memItemRight" valign="bottom"><b>size_type</b> = io_handle::size_type</td></tr>
<tr class="separator:a26d90317426d6a95abb27caff26d1568"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4a2fc92b11c3dc6021436261eab13e48"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4a2fc92b11c3dc6021436261eab13e48"></a>
using </td><td class="memItemRight" valign="bottom"><b>mode</b> = <a class="el" href="classafio__v2__xxx_1_1handle.html#a0489b6c1e25cd2bad2ba1ec86e1aaf18">io_handle::mode</a></td></tr>
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<tr class="memitem:a1d6628e75030c5f83dd679ff0a7a6d6b"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1d6628e75030c5f83dd679ff0a7a6d6b"></a>
using </td><td class="memItemRight" valign="bottom"><b>creation</b> = <a class="el" href="classafio__v2__xxx_1_1handle.html#a45ff5c1c5662623d99156870dfeee0a7">io_handle::creation</a></td></tr>
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<tr class="memitem:a8e76ea37b167d23b43b27794282667f4"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a8e76ea37b167d23b43b27794282667f4"></a>
using </td><td class="memItemRight" valign="bottom"><b>caching</b> = <a class="el" href="classafio__v2__xxx_1_1handle.html#a6f7e37c73271968271c2342023f58c9e">io_handle::caching</a></td></tr>
<tr class="separator:a8e76ea37b167d23b43b27794282667f4"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a4ac624b2af8f1cccdf87d80f5542b709"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4ac624b2af8f1cccdf87d80f5542b709"></a>
using </td><td class="memItemRight" valign="bottom"><b>flag</b> = io_handle::flag</td></tr>
<tr class="separator:a4ac624b2af8f1cccdf87d80f5542b709"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a45a37a4b395e125f84cd9a9e1995c504"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a45a37a4b395e125f84cd9a9e1995c504"></a>
using </td><td class="memItemRight" valign="bottom"><b>buffer_type</b> = <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">io_handle::buffer_type</a></td></tr>
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<tr class="memitem:abe6c2e6318b90d83660f47f9a8ec24d1"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="abe6c2e6318b90d83660f47f9a8ec24d1"></a>
using </td><td class="memItemRight" valign="bottom"><b>const_buffer_type</b> = <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1const__buffer__type.html">io_handle::const_buffer_type</a></td></tr>
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<tr class="memitem:a0af15b220ec3cfd1816206a5e795c934"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a0af15b220ec3cfd1816206a5e795c934"></a>
using </td><td class="memItemRight" valign="bottom"><b>buffers_type</b> = <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">io_handle::buffers_type</a></td></tr>
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<tr class="memitem:a272e3e3dd846e5a4ee86e7193403500a"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a272e3e3dd846e5a4ee86e7193403500a"></a>
using </td><td class="memItemRight" valign="bottom"><b>const_buffers_type</b> = <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">io_handle::const_buffers_type</a></td></tr>
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<tr class="memitem:a9051ebc2ea492cdd7c14e01fbb5a3a92"><td class="memTemplParams" colspan="2"><a class="anchor" id="a9051ebc2ea492cdd7c14e01fbb5a3a92"></a>
template<class T > </td></tr>
<tr class="memitem:a9051ebc2ea492cdd7c14e01fbb5a3a92"><td class="memTemplItemLeft" align="right" valign="top">using </td><td class="memTemplItemRight" valign="bottom"><b>io_request</b> = <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_handle::io_request</a>< T ></td></tr>
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<tr class="memitem:a1ea36471bce9cae1604da211a4afa779"><td class="memTemplParams" colspan="2"><a class="anchor" id="a1ea36471bce9cae1604da211a4afa779"></a>
template<class T > </td></tr>
<tr class="memitem:a1ea36471bce9cae1604da211a4afa779"><td class="memTemplItemLeft" align="right" valign="top">using </td><td class="memTemplItemRight" valign="bottom"><b>io_result</b> = <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_handle::io_result</a>< T ></td></tr>
<tr class="separator:a1ea36471bce9cae1604da211a4afa779"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aacabd3633b7c08a422c3e912f6319959"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aacabd3633b7c08a422c3e912f6319959"></a>
using </td><td class="memItemRight" valign="bottom"><b>path_type</b> = <a class="el" href="classafio__v2__xxx_1_1handle.html#a6c4df2242ece6f63ba7ef4e6baafaca6">handle::path_type</a></td></tr>
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<tr class="memitem:a04971d1f6ab4059556caafb3ad0e19a3"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a04971d1f6ab4059556caafb3ad0e19a3"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a04971d1f6ab4059556caafb3ad0e19a3">unique_id_type</a> = QUICKCPPLIB_NAMESPACE::integers128::uint128</td></tr>
<tr class="memdesc:a04971d1f6ab4059556caafb3ad0e19a3"><td class="mdescLeft"> </td><td class="mdescRight">The unique identifier type used by this handle. <br/></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:affbe8e19b49422cd1ec8880638cb6ac9"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="affbe8e19b49422cd1ec8880638cb6ac9"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#affbe8e19b49422cd1ec8880638cb6ac9">map_handle</a> ()</td></tr>
<tr class="memdesc:affbe8e19b49422cd1ec8880638cb6ac9"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <br/></td></tr>
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<tr class="memitem:abae695e1c1d89dce7ca686645a0213ee"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="abae695e1c1d89dce7ca686645a0213ee"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#abae695e1c1d89dce7ca686645a0213ee">map_handle</a> (<a class="el" href="classafio__v2__xxx_1_1map__handle.html">map_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:abae695e1c1d89dce7ca686645a0213ee"><td class="mdescLeft"> </td><td class="mdescRight">Implicit move construction of map_handle permitted. <br/></td></tr>
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<tr class="memitem:aa2de383f07c16362890a8602d6089cef"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa2de383f07c16362890a8602d6089cef"></a>
<a class="el" href="classafio__v2__xxx_1_1map__handle.html">map_handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#aa2de383f07c16362890a8602d6089cef">operator=</a> (<a class="el" href="classafio__v2__xxx_1_1map__handle.html">map_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:aa2de383f07c16362890a8602d6089cef"><td class="mdescLeft"> </td><td class="mdescRight">Move assignment of map_handle permitted. <br/></td></tr>
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<tr class="memitem:a295685127f9dacc561b5f9600d82fad5"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a295685127f9dacc561b5f9600d82fad5"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#a295685127f9dacc561b5f9600d82fad5">swap</a> (<a class="el" href="classafio__v2__xxx_1_1map__handle.html">map_handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a295685127f9dacc561b5f9600d82fad5"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br/></td></tr>
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<tr class="memitem:a1de468f5375b9da6fc14dd3cd76fa998"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1de468f5375b9da6fc14dd3cd76fa998"></a>
virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#a1de468f5375b9da6fc14dd3cd76fa998">close</a> () noexceptoverride</td></tr>
<tr class="memdesc:a1de468f5375b9da6fc14dd3cd76fa998"><td class="mdescLeft"> </td><td class="mdescRight">Unmap the mapped view. <br/></td></tr>
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<tr class="memitem:afb8db753542d228ed96ce3fb4cb26b97"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="afb8db753542d228ed96ce3fb4cb26b97"></a>
virtual <a class="el" href="structafio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#afb8db753542d228ed96ce3fb4cb26b97">release</a> () noexceptoverride</td></tr>
<tr class="memdesc:afb8db753542d228ed96ce3fb4cb26b97"><td class="mdescLeft"> </td><td class="mdescRight">Releases the mapped view, but does NOT release the native handle. <br/></td></tr>
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<tr class="memitem:af1f02d7f4c5a61ad9d0a09d2a501f97e"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af1f02d7f4c5a61ad9d0a09d2a501f97e"></a>
virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><br class="typebreak"/>
< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > </td><td class="memItemRight" valign="bottom"><b>barrier</b> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > reqs=<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> >(), bool wait_for_device=false, bool and_metadata=false, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexceptoverride</td></tr>
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<tr class="memitem:ab8a43a5388161f629fef5ee7256dbbc8"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ab8a43a5388161f629fef5ee7256dbbc8"></a>
<a class="el" href="classafio__v2__xxx_1_1section__handle.html">section_handle</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#ab8a43a5388161f629fef5ee7256dbbc8">section</a> () const noexcept</td></tr>
<tr class="memdesc:ab8a43a5388161f629fef5ee7256dbbc8"><td class="mdescLeft"> </td><td class="mdescRight">The memory section this handle is using. <br/></td></tr>
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<tr class="memitem:a1e9273d0c6aca7da6480437f6cf6638a"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1e9273d0c6aca7da6480437f6cf6638a"></a>
char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#a1e9273d0c6aca7da6480437f6cf6638a">address</a> () const noexcept</td></tr>
<tr class="memdesc:a1e9273d0c6aca7da6480437f6cf6638a"><td class="mdescLeft"> </td><td class="mdescRight">The address in memory where this mapped view resides. <br/></td></tr>
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<tr class="memitem:ac049430769b0fa1d06c93160cef5a2f9"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac049430769b0fa1d06c93160cef5a2f9"></a>
<a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#ac049430769b0fa1d06c93160cef5a2f9">offset</a> () const noexcept</td></tr>
<tr class="memdesc:ac049430769b0fa1d06c93160cef5a2f9"><td class="mdescLeft"> </td><td class="mdescRight">The offset of the memory map. <br/></td></tr>
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<tr class="memitem:aba6ebe9afaccfaf59a92c5b85c72e7d2"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aba6ebe9afaccfaf59a92c5b85c72e7d2"></a>
<a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#aba6ebe9afaccfaf59a92c5b85c72e7d2">length</a> () const noexcept</td></tr>
<tr class="memdesc:aba6ebe9afaccfaf59a92c5b85c72e7d2"><td class="mdescLeft"> </td><td class="mdescRight">The size of the memory map. <br/></td></tr>
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<tr class="memitem:a9e2e22376e63670584421cd055c1b6ff"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a9e2e22376e63670584421cd055c1b6ff"></a>
result< <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#a9e2e22376e63670584421cd055c1b6ff">commit</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> region, section_handle::flag _flag=section_handle::flag::read|section_handle::flag::write) noexcept</td></tr>
<tr class="memdesc:a9e2e22376e63670584421cd055c1b6ff"><td class="mdescLeft"> </td><td class="mdescRight">Ask the system to commit the system resources to make the memory represented by the buffer available with the given permissions. addr and length should be page aligned (see utils::page_sizes()), if not the returned buffer is the region actually committed. <br/></td></tr>
<tr class="separator:a9e2e22376e63670584421cd055c1b6ff"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a5b69e8faa8a9e47dec1b1a123c722a3e"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5b69e8faa8a9e47dec1b1a123c722a3e"></a>
result< <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#a5b69e8faa8a9e47dec1b1a123c722a3e">decommit</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> region) noexcept</td></tr>
<tr class="memdesc:a5b69e8faa8a9e47dec1b1a123c722a3e"><td class="mdescLeft"> </td><td class="mdescRight">Ask the system to make the memory represented by the buffer unavailable and to decommit the system resources representing them. addr and length should be page aligned (see utils::page_sizes()), if not the returned buffer is the region actually decommitted. <br/></td></tr>
<tr class="separator:a5b69e8faa8a9e47dec1b1a123c722a3e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ac35a85e8a6cca721640ddc6b5008e145"><td class="memItemLeft" align="right" valign="top">result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#ac35a85e8a6cca721640ddc6b5008e145">zero_memory</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> region) noexcept</td></tr>
<tr class="separator:ac35a85e8a6cca721640ddc6b5008e145"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa25715985351f79e034bb1ef37f74824"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#aa25715985351f79e034bb1ef37f74824">do_not_store</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> region) noexcept</td></tr>
<tr class="separator:aa25715985351f79e034bb1ef37f74824"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad50026d4eca2ddd77b5f9877666857b8"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#ad50026d4eca2ddd77b5f9877666857b8">read</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a> > reqs, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexceptoverride</td></tr>
<tr class="memdesc:ad50026d4eca2ddd77b5f9877666857b8"><td class="mdescLeft"> </td><td class="mdescRight">Read data from the mapped view. <a href="#ad50026d4eca2ddd77b5f9877666857b8">More...</a><br/></td></tr>
<tr class="separator:ad50026d4eca2ddd77b5f9877666857b8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a162d844e3dfcfcfad698a404bd55ef04"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><br class="typebreak"/>
< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#a162d844e3dfcfcfad698a404bd55ef04">write</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > reqs, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexceptoverride</td></tr>
<tr class="memdesc:a162d844e3dfcfcfad698a404bd55ef04"><td class="mdescLeft"> </td><td class="mdescRight">Write data to the mapped view. <a href="#a162d844e3dfcfcfad698a404bd55ef04">More...</a><br/></td></tr>
<tr class="separator:a162d844e3dfcfcfad698a404bd55ef04"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a71d7636f40607829cacc2c974c4a2a28"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#a71d7636f40607829cacc2c974c4a2a28">read</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a> > reqs, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:a71d7636f40607829cacc2c974c4a2a28"><td class="mdescLeft"> </td><td class="mdescRight">Read data from the open handle. <a href="#a71d7636f40607829cacc2c974c4a2a28">More...</a><br/></td></tr>
<tr class="separator:a71d7636f40607829cacc2c974c4a2a28"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8af6c6dc1502d40f6aaccc83e49d5342"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a>< <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#a8af6c6dc1502d40f6aaccc83e49d5342">read</a> (<a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> <a class="el" href="classafio__v2__xxx_1_1map__handle.html#ac049430769b0fa1d06c93160cef5a2f9">offset</a>, char *data, <a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> bytes, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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<tr class="memitem:aefac4710e5617264347f437b04732c01"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><br class="typebreak"/>
< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#aefac4710e5617264347f437b04732c01">write</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > reqs, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:aefac4710e5617264347f437b04732c01"><td class="mdescLeft"> </td><td class="mdescRight">Write data to the open handle. <a href="#aefac4710e5617264347f437b04732c01">More...</a><br/></td></tr>
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<tr class="memitem:ab26a3c5a18cdcc67a506533dbe55e2b3"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a>< <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1const__buffer__type.html">const_buffer_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#ab26a3c5a18cdcc67a506533dbe55e2b3">write</a> (<a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> <a class="el" href="classafio__v2__xxx_1_1map__handle.html#ac049430769b0fa1d06c93160cef5a2f9">offset</a>, const char *data, <a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> bytes, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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<tr class="memitem:a243156928e89b8988a1412f211b3b603"><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><br class="typebreak"/>
< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#a243156928e89b8988a1412f211b3b603">barrier</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > reqs=<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> >(), bool wait_for_device=false, bool and_metadata=false, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept=0</td></tr>
<tr class="memdesc:a243156928e89b8988a1412f211b3b603"><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. <a href="#a243156928e89b8988a1412f211b3b603">More...</a><br/></td></tr>
<tr class="separator:a243156928e89b8988a1412f211b3b603"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a88689b15e6e8b6ce1f945737dee4369e"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="classafio__v2__xxx_1_1io__handle_1_1extent__guard.html">extent_guard</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#a88689b15e6e8b6ce1f945737dee4369e">lock</a> (<a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> <a class="el" href="classafio__v2__xxx_1_1map__handle.html#ac049430769b0fa1d06c93160cef5a2f9">offset</a>, <a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> bytes, bool exclusive=true, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
<tr class="memdesc:a88689b15e6e8b6ce1f945737dee4369e"><td class="mdescLeft"> </td><td class="mdescRight">Tries to lock the range of bytes specified for shared or exclusive access. Be aware this passes through the same semantics as the underlying OS call, including any POSIX insanity present on your platform. <a href="#a88689b15e6e8b6ce1f945737dee4369e">More...</a><br/></td></tr>
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<tr class="memitem:ad44dcd9c7ca9e7a094dd1bc7c8aa4897"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classafio__v2__xxx_1_1io__handle_1_1extent__guard.html">extent_guard</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#ad44dcd9c7ca9e7a094dd1bc7c8aa4897">lock</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a> > reqs, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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<tr class="memitem:aeabd245b6edcfb57779b29c6f2ea9737"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classafio__v2__xxx_1_1io__handle_1_1extent__guard.html">extent_guard</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#aeabd245b6edcfb57779b29c6f2ea9737">lock</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > reqs, <a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> d=<a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()) noexcept</td></tr>
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<tr class="memitem:a0a1c4773b9fa7bbd04fee0756075d319"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classafio__v2__xxx_1_1io__handle_1_1extent__guard.html">extent_guard</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#a0a1c4773b9fa7bbd04fee0756075d319">try_lock</a> (<a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> <a class="el" href="classafio__v2__xxx_1_1map__handle.html#ac049430769b0fa1d06c93160cef5a2f9">offset</a>, <a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> bytes, bool exclusive=true) noexcept</td></tr>
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<tr class="memitem:a96b9da71ee7791fbaaa2470c936ec763"><td class="memItemLeft" align="right" valign="top">virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1io__handle.html#a96b9da71ee7791fbaaa2470c936ec763">unlock</a> (<a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> <a class="el" href="classafio__v2__xxx_1_1map__handle.html#ac049430769b0fa1d06c93160cef5a2f9">offset</a>, <a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> bytes) noexcept</td></tr>
<tr class="memdesc:a96b9da71ee7791fbaaa2470c936ec763"><td class="mdescLeft"> </td><td class="mdescRight">Unlocks a byte range previously locked. <a href="#a96b9da71ee7791fbaaa2470c936ec763">More...</a><br/></td></tr>
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<tr class="memitem:a657c12a309cf02bf2351bfcc7f41463b"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a657c12a309cf02bf2351bfcc7f41463b"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a657c12a309cf02bf2351bfcc7f41463b">swap</a> (<a class="el" href="classafio__v2__xxx_1_1handle.html">handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a657c12a309cf02bf2351bfcc7f41463b"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br/></td></tr>
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<tr class="memitem:a1d633fb0752e739e057503fbf5dc6e80"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a1d633fb0752e739e057503fbf5dc6e80"></a>
virtual <a class="el" href="classafio__v2__xxx_1_1handle.html#a04971d1f6ab4059556caafb3ad0e19a3">unique_id_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a1d633fb0752e739e057503fbf5dc6e80">unique_id</a> () const noexcept</td></tr>
<tr class="memdesc:a1d633fb0752e739e057503fbf5dc6e80"><td class="mdescLeft"> </td><td class="mdescRight">A unique identifier for this handle in this process (native handle). Subclasses like <code>file_handle</code> make this a unique identifier across the entire system. <br/></td></tr>
<tr class="separator:a1d633fb0752e739e057503fbf5dc6e80"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a616a67222676af5ec5b3aa94d7c02428"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="classafio__v2__xxx_1_1handle.html#a6c4df2242ece6f63ba7ef4e6baafaca6">path_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a616a67222676af5ec5b3aa94d7c02428">current_path</a> () const noexcept</td></tr>
<tr class="separator:a616a67222676af5ec5b3aa94d7c02428"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a54790e954f57372b87b095451cc79c38"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classafio__v2__xxx_1_1handle.html">handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a54790e954f57372b87b095451cc79c38">clone</a> () const noexcept</td></tr>
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<tr class="memitem:a4194a05dd9694d2c47d5a45f925db1d7"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a4194a05dd9694d2c47d5a45f925db1d7"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a4194a05dd9694d2c47d5a45f925db1d7">is_valid</a> () const noexcept</td></tr>
<tr class="memdesc:a4194a05dd9694d2c47d5a45f925db1d7"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is valid (and usually open) <br/></td></tr>
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<tr class="memitem:a349e001cbe359d4e7a8f066c69e9361e"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a349e001cbe359d4e7a8f066c69e9361e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a349e001cbe359d4e7a8f066c69e9361e">is_readable</a> () const noexcept</td></tr>
<tr class="memdesc:a349e001cbe359d4e7a8f066c69e9361e"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is readable. <br/></td></tr>
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<tr class="memitem:a5be9a526bc5c1be758b0cfc36a262f6e"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5be9a526bc5c1be758b0cfc36a262f6e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a5be9a526bc5c1be758b0cfc36a262f6e">is_writable</a> () const noexcept</td></tr>
<tr class="memdesc:a5be9a526bc5c1be758b0cfc36a262f6e"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is writable. <br/></td></tr>
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<tr class="memitem:ae33d4d0faa1377cd371bd6a0ae0769ae"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ae33d4d0faa1377cd371bd6a0ae0769ae"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#ae33d4d0faa1377cd371bd6a0ae0769ae">is_append_only</a> () const noexcept</td></tr>
<tr class="memdesc:ae33d4d0faa1377cd371bd6a0ae0769ae"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is append only. <br/></td></tr>
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<tr class="memitem:af1610ec7fb0a41f039e3e17e0dc467ab"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#af1610ec7fb0a41f039e3e17e0dc467ab">set_append_only</a> (bool enable) noexcept</td></tr>
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<tr class="memitem:af42904dd49b5517a303e7cb256eae939"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af42904dd49b5517a303e7cb256eae939"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#af42904dd49b5517a303e7cb256eae939">is_overlapped</a> () const noexcept</td></tr>
<tr class="memdesc:af42904dd49b5517a303e7cb256eae939"><td class="mdescLeft"> </td><td class="mdescRight">True if overlapped. <br/></td></tr>
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<tr class="memitem:aac62f621c42be6eeb8d9a5700da367f9"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aac62f621c42be6eeb8d9a5700da367f9"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#aac62f621c42be6eeb8d9a5700da367f9">is_seekable</a> () const noexcept</td></tr>
<tr class="memdesc:aac62f621c42be6eeb8d9a5700da367f9"><td class="mdescLeft"> </td><td class="mdescRight">True if seekable. <br/></td></tr>
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<tr class="memitem:affb10caeeca67b804695b7378be29e23"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="affb10caeeca67b804695b7378be29e23"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#affb10caeeca67b804695b7378be29e23">requires_aligned_io</a> () const noexcept</td></tr>
<tr class="memdesc:affb10caeeca67b804695b7378be29e23"><td class="mdescLeft"> </td><td class="mdescRight">True if requires aligned i/o. <br/></td></tr>
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<tr class="memitem:a526c300d421155ccc071b04db4bca65d"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a526c300d421155ccc071b04db4bca65d"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a526c300d421155ccc071b04db4bca65d">is_regular</a> () const noexcept</td></tr>
<tr class="memdesc:a526c300d421155ccc071b04db4bca65d"><td class="mdescLeft"> </td><td class="mdescRight">True if a regular file or device. <br/></td></tr>
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<tr class="memitem:aa53d88105df8c6be01be649829a65b14"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="aa53d88105df8c6be01be649829a65b14"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#aa53d88105df8c6be01be649829a65b14">is_directory</a> () const noexcept</td></tr>
<tr class="memdesc:aa53d88105df8c6be01be649829a65b14"><td class="mdescLeft"> </td><td class="mdescRight">True if a directory. <br/></td></tr>
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<tr class="memitem:a3c777f045dc2b0248b891d6e7811d152"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3c777f045dc2b0248b891d6e7811d152"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a3c777f045dc2b0248b891d6e7811d152">is_symlink</a> () const noexcept</td></tr>
<tr class="memdesc:a3c777f045dc2b0248b891d6e7811d152"><td class="mdescLeft"> </td><td class="mdescRight">True if a symlink. <br/></td></tr>
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<tr class="memitem:ab790af4654f5455d8c5e1f1d397543ca"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ab790af4654f5455d8c5e1f1d397543ca"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#ab790af4654f5455d8c5e1f1d397543ca">is_multiplexer</a> () const noexcept</td></tr>
<tr class="memdesc:ab790af4654f5455d8c5e1f1d397543ca"><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:ad02958278a0d92e4ec4fb864ba1eb35b"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad02958278a0d92e4ec4fb864ba1eb35b"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#ad02958278a0d92e4ec4fb864ba1eb35b">is_process</a> () const noexcept</td></tr>
<tr class="memdesc:ad02958278a0d92e4ec4fb864ba1eb35b"><td class="mdescLeft"> </td><td class="mdescRight">True if a process. <br/></td></tr>
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<tr class="memitem:ac5b2859fabe04dbfc37020daed618257"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac5b2859fabe04dbfc37020daed618257"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#ac5b2859fabe04dbfc37020daed618257">is_section</a> () const noexcept</td></tr>
<tr class="memdesc:ac5b2859fabe04dbfc37020daed618257"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory section. <br/></td></tr>
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<tr class="memitem:a00f42a44de714feb3ed86dd0a175e69c"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a00f42a44de714feb3ed86dd0a175e69c"></a>
<a class="el" href="classafio__v2__xxx_1_1handle.html#a6f7e37c73271968271c2342023f58c9e">caching</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a00f42a44de714feb3ed86dd0a175e69c">kernel_caching</a> () const noexcept</td></tr>
<tr class="memdesc:a00f42a44de714feb3ed86dd0a175e69c"><td class="mdescLeft"> </td><td class="mdescRight">Kernel cache strategy used by this handle. <br/></td></tr>
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<tr class="memitem:a71137cb82edd9a1bcb24f64886b5826d"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a71137cb82edd9a1bcb24f64886b5826d"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a71137cb82edd9a1bcb24f64886b5826d">are_reads_from_cache</a> () const noexcept</td></tr>
<tr class="memdesc:a71137cb82edd9a1bcb24f64886b5826d"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle uses the kernel page cache for reads. <br/></td></tr>
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<tr class="memitem:a97ffbbf53f51549549efef0b49e125dc"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a97ffbbf53f51549549efef0b49e125dc"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a97ffbbf53f51549549efef0b49e125dc">are_writes_durable</a> () const noexcept</td></tr>
<tr class="memdesc:a97ffbbf53f51549549efef0b49e125dc"><td class="mdescLeft"> </td><td class="mdescRight">True if writes are safely on storage on completion. <br/></td></tr>
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<tr class="memitem:a3fc7db93fac699f5ecad453642ed314e"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3fc7db93fac699f5ecad453642ed314e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a3fc7db93fac699f5ecad453642ed314e">are_safety_fsyncs_issued</a> () const noexcept</td></tr>
<tr class="memdesc:a3fc7db93fac699f5ecad453642ed314e"><td class="mdescLeft"> </td><td class="mdescRight">True if issuing safety fsyncs is on. <br/></td></tr>
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<tr class="memitem:ad90f8264470763069256ae9eeda45e69"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#ad90f8264470763069256ae9eeda45e69">set_kernel_caching</a> (<a class="el" href="classafio__v2__xxx_1_1handle.html#a6f7e37c73271968271c2342023f58c9e">caching</a> <a class="el" href="classafio__v2__xxx_1_1handle.html#a6f7e37c73271968271c2342023f58c9e">caching</a>) noexcept</td></tr>
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<tr class="memitem:ab3d876f5996605158fd6a0582adadad6"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ab3d876f5996605158fd6a0582adadad6"></a>
flag </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#ab3d876f5996605158fd6a0582adadad6">flags</a> () const noexcept</td></tr>
<tr class="memdesc:ab3d876f5996605158fd6a0582adadad6"><td class="mdescLeft"> </td><td class="mdescRight">The flags this handle was opened with. <br/></td></tr>
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<tr class="memitem:a875440f1b368472f1840c70c266f3a48"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a875440f1b368472f1840c70c266f3a48"></a>
<a class="el" href="structafio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1handle.html#a875440f1b368472f1840c70c266f3a48">native_handle</a> () const noexcept</td></tr>
<tr class="memdesc:a875440f1b368472f1840c70c266f3a48"><td class="mdescLeft"> </td><td class="mdescRight">The native handle used by this handle. <br/></td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:af5f18eca79c68d7db2923c2817d1c6fb"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classafio__v2__xxx_1_1map__handle.html">map_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#af5f18eca79c68d7db2923c2817d1c6fb">map</a> (<a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> bytes, section_handle::flag _flag=section_handle::flag::read|section_handle::flag::write) noexcept</td></tr>
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<tr class="memitem:a820a00dbe33ffa034e1c4fe15aa89193"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classafio__v2__xxx_1_1map__handle.html">map_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#a820a00dbe33ffa034e1c4fe15aa89193">map</a> (<a class="el" href="classafio__v2__xxx_1_1section__handle.html">section_handle</a> &<a class="el" href="classafio__v2__xxx_1_1map__handle.html#ab8a43a5388161f629fef5ee7256dbbc8">section</a>, <a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> bytes=0, <a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> <a class="el" href="classafio__v2__xxx_1_1map__handle.html#ac049430769b0fa1d06c93160cef5a2f9">offset</a>=0, section_handle::flag _flag=section_handle::flag::read|section_handle::flag::write) noexcept</td></tr>
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static result< span<br class="typebreak"/>
< <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> > > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#ae16cb0af9b96f90f87f42318f7d35e65">prefetch</a> (span< <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> > regions) noexcept</td></tr>
<tr class="memdesc:ae16cb0af9b96f90f87f42318f7d35e65"><td class="mdescLeft"> </td><td class="mdescRight">Ask the system to begin to asynchronously prefetch the span of memory regions given, returning the regions actually prefetched. Note that on Windows 7 or earlier the system call to implement this was not available, and so you will see an empty span returned. <br/></td></tr>
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<tr class="memitem:ab569da5c3ffa64200f8b10dbe683bbc8"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classafio__v2__xxx_1_1map__handle.html#ab569da5c3ffa64200f8b10dbe683bbc8">prefetch</a> (<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> region) noexcept</td></tr>
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</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
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 </td><td class="memItemRight" valign="bottom"><b>map_handle</b> (<a class="el" href="classafio__v2__xxx_1_1section__handle.html">section_handle</a> *<a class="el" href="classafio__v2__xxx_1_1map__handle.html#ab8a43a5388161f629fef5ee7256dbbc8">section</a>)</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>
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<a class="el" href="classafio__v2__xxx_1_1section__handle.html">section_handle</a> * </td><td class="memItemRight" valign="bottom"><b>_section</b></td></tr>
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char * </td><td class="memItemRight" valign="bottom"><b>_addr</b></td></tr>
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<tr class="memitem:a5b7bae1f24ec1ae96822fb865bfd0ea5"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a5b7bae1f24ec1ae96822fb865bfd0ea5"></a>
<a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td><td class="memItemRight" valign="bottom"><b>_offset</b></td></tr>
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<tr class="memitem:adffdff916ccf13d88a02ddb6b6a421c8"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="adffdff916ccf13d88a02ddb6b6a421c8"></a>
<a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> </td><td class="memItemRight" valign="bottom"><b>_length</b></td></tr>
<tr class="separator:adffdff916ccf13d88a02ddb6b6a421c8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af024e3d92d9a01ac367734e9cdc517fb"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af024e3d92d9a01ac367734e9cdc517fb"></a>
<a class="el" href="classafio__v2__xxx_1_1handle.html#a6f7e37c73271968271c2342023f58c9e">caching</a> </td><td class="memItemRight" valign="bottom"><b>_caching</b></td></tr>
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<tr class="memitem:ac46e0a296c31fcd0a996a79d78647fb6"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac46e0a296c31fcd0a996a79d78647fb6"></a>
flag </td><td class="memItemRight" valign="bottom"><b>_flags</b></td></tr>
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<tr class="memitem:a771ef2bf39ad784eb6265dde077792ad"><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a771ef2bf39ad784eb6265dde077792ad"></a>
<a class="el" href="structafio__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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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A handle to a memory mapped region of memory. </p>
<dl class="section note"><dt>Note</dt><dd>The native handle returned by this map handle is always that of the backing storage, but closing this handle does not close that of the backing storage, nor does releasing this handle release that of the backing storage. Locking byte ranges of this handle is therefore equal to locking byte ranges in the original backing storage. </dd></dl>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><<a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a>> afio_v2_xxx::io_handle::barrier </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > </td>
<td class="paramname"><em>reqs</em> = <code><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> >()</code>, </td>
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<td class="paramtype">bool </td>
<td class="paramname"><em>wait_for_device</em> = <code>false</code>, </td>
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<td class="paramtype">bool </td>
<td class="paramname"><em>and_metadata</em> = <code>false</code>, </td>
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<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<td>)</td>
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<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">pure virtual</span><span class="mlabel">noexcept</span><span class="mlabel">inherited</span></span> </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. </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. It may be ignored entirely.</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>
<table class="params">
<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">wait_for_device</td><td>True if you want the call to wait until data reaches storage and that storage has acknowledged the data is physically written. Slow. </td></tr>
<tr><td class="paramname">and_metadata</td><td>True if you want the call to sync the metadata for retrieving the writes before the barrier after a sudden power loss event. Slow. </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>
</dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX fdatasync() or Windows NtFlushBuffersFileEx() can return. </dd></dl>
<dl class="section user"><dt>Memory Allocations</dt><dd>None. </dd></dl>
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<td class="memname">result<<a class="el" href="classafio__v2__xxx_1_1handle.html">handle</a>> afio_v2_xxx::handle::clone </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</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>Clone this handle (copy constructor is disabled to avoid accidental copying)</p>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX dup() or DuplicateHandle() can return. </dd></dl>
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<td class="memname">virtual result<<a class="el" href="classafio__v2__xxx_1_1handle.html#a6c4df2242ece6f63ba7ef4e6baafaca6">path_type</a>> afio_v2_xxx::handle::current_path </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
<td> const</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, many operating systems will return some different path which still reaches the same inode via some other route e.g. hardlinks, dereferenced symbolic links, etc.</p>
<p>If AFIO was not able to determine the current path for this open handle e.g. the inode has been unlinked, it returns an empty path. Some operating systems e.g. FreeBSD also only can fetch the current path for directory inodes, not file inodes.</p>
<dl class="section warning"><dt>Warning</dt><dd>This call is expensive, it always asks the kernel for the current path, and if <code>disable_safety_unlinks</code> is off (the default) it checks the path returned to ensure it does actually point at the correct inode. 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>
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<td class="memname">result<<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a>> afio_v2_xxx::map_handle::do_not_store </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> </td>
<td class="paramname"><em>region</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">noexcept</span></span> </td>
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<p>Ask the system to unset the dirty flag for the memory represented by the buffer. This will prevent any changes not yet sent to the backing storage from being sent in the future, also if the system kicks out this page and reloads it you may see some edition of the underlying storage instead of what was here. addr and length should be page aligned (see utils::page_sizes()), if not the returned buffer is the region actually undirtied.</p>
<dl class="section warning"><dt>Warning</dt><dd>This function destroys the contents of unwritten pages in the region in a totally unpredictable fashion. Only use it if you don't care how much of the region reaches physical storage or not. Note that the region is not necessarily zeroed, and may be randomly zeroed.</dd></dl>
<dl class="section note"><dt>Note</dt><dd>Microsoft Windows does not support unsetting the dirty flag on file backed maps, so on Windows this call does nothing. </dd></dl>
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<td class="memname">virtual result<<a class="el" href="classafio__v2__xxx_1_1io__handle_1_1extent__guard.html">extent_guard</a>> afio_v2_xxx::io_handle::lock </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>offset</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>bytes</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>exclusive</em> = <code>true</code>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span><span class="mlabel">noexcept</span><span class="mlabel">inherited</span></span> </td>
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<p>Tries to lock the range of bytes specified for shared or exclusive access. Be aware this passes through the same semantics as the underlying OS call, including any POSIX insanity present on your platform. </p>
<dl class="section warning"><dt>Warning</dt><dd>On older Linuxes and POSIX, this uses <code>fcntl()</code> with the well known insane POSIX semantics that closing ANY handle to this file releases all bytes range locks on it. 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.</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>
<table class="params">
<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. Zero means lock the entire file using any more efficient alternative algorithm where available on your platform (specifically, on BSD and OS X use flock() for non-insane semantics). </td></tr>
<tr><td class="paramname">exclusive</td><td>Whether the lock is to be 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>
</table>
</dd>
</dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX fcntl() can return, <code>errc::timed_out</code>, <code>errc::not_supported</code> may be 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</dt><dd>The default synchronous implementation in file_handle performs no memory allocation. The asynchronous implementation in async_file_handle performs one calloc and one free. </dd></dl>
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<td class="memname">result<<a class="el" href="classafio__v2__xxx_1_1io__handle_1_1extent__guard.html">extent_guard</a>> afio_v2_xxx::io_handle::lock </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a> > </td>
<td class="paramname"><em>reqs</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<td></td>
<td>)</td>
<td></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>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
<div class="fragment"><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  {</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <span class="keywordtype">size_t</span> bytes = 0;</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  <span class="keywordflow">for</span>(<span class="keyword">auto</span> &i : reqs.buffers)</div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  {</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <span class="keywordflow">if</span>(bytes + i.len < bytes)</div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <span class="keywordflow">return</span> std::errc::value_too_large;</div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  bytes += i.len;</div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  }</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="keywordflow">return</span> <a class="code" href="classafio__v2__xxx_1_1io__handle.html#a88689b15e6e8b6ce1f945737dee4369e">lock</a>(reqs.offset, bytes, <span class="keyword">false</span>, std::move(d));</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  }</div>
<div class="ttc" id="classafio__v2__xxx_1_1io__handle_html_a88689b15e6e8b6ce1f945737dee4369e"><div class="ttname"><a href="classafio__v2__xxx_1_1io__handle.html#a88689b15e6e8b6ce1f945737dee4369e">afio_v2_xxx::io_handle::lock</a></div><div class="ttdeci">virtual result< extent_guard > lock(extent_type offset, extent_type bytes, bool exclusive=true, deadline d=deadline()) noexcept</div><div class="ttdoc">Tries to lock the range of bytes specified for shared or exclusive access. Be aware this passes throu...</div></div>
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<td class="memname">result<<a class="el" href="classafio__v2__xxx_1_1io__handle_1_1extent__guard.html">extent_guard</a>> afio_v2_xxx::io_handle::lock </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > </td>
<td class="paramname"><em>reqs</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<td></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>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
<div class="fragment"><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  {</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="keywordtype">size_t</span> bytes = 0;</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  <span class="keywordflow">for</span>(<span class="keyword">auto</span> &i : reqs.buffers)</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  {</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  <span class="keywordflow">if</span>(bytes + i.len < bytes)</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="keywordflow">return</span> std::errc::value_too_large;</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  bytes += i.len;</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  }</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="keywordflow">return</span> <a class="code" href="classafio__v2__xxx_1_1io__handle.html#a88689b15e6e8b6ce1f945737dee4369e">lock</a>(reqs.offset, bytes, <span class="keyword">true</span>, std::move(d));</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  }</div>
<div class="ttc" id="classafio__v2__xxx_1_1io__handle_html_a88689b15e6e8b6ce1f945737dee4369e"><div class="ttname"><a href="classafio__v2__xxx_1_1io__handle.html#a88689b15e6e8b6ce1f945737dee4369e">afio_v2_xxx::io_handle::lock</a></div><div class="ttdeci">virtual result< extent_guard > lock(extent_type offset, extent_type bytes, bool exclusive=true, deadline d=deadline()) noexcept</div><div class="ttdoc">Tries to lock the range of bytes specified for shared or exclusive access. Be aware this passes throu...</div></div>
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<td class="memname">static result<<a class="el" href="classafio__v2__xxx_1_1map__handle.html">map_handle</a>> afio_v2_xxx::map_handle::map </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> </td>
<td class="paramname"><em>bytes</em>, </td>
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<td></td>
<td class="paramtype">section_handle::flag </td>
<td class="paramname"><em>_flag</em> = <code>section_handle::flag::read|section_handle::flag::write</code> </td>
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<td>)</td>
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<p>Create new memory and map it into view. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">bytes</td><td>How many bytes to create and map. Typically will be rounded to a multiple of the page size (see utils::page_sizes()). </td></tr>
<tr><td class="paramname">_flag</td><td>The permissions with which to map the view which are constrained by the permissions of the memory section. <code>flag::none</code> can be useful for reserving virtual address space without committing system resources, use commit() to later change availability of memory.</td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>On Microsoft Windows this constructor uses the faster VirtualAlloc() which creates less versatile page backed memory. If you want anonymous memory allocated from a paging file backed section instead, create a page file backed section and then a mapped view from that using the other constructor. This makes available all those very useful VM tricks Windows can do with section mapped memory which VirtualAlloc() memory cannot do.</dd></dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX mmap() or NtMapViewOfSection() can return. </dd></dl>
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<td class="memname">static result<<a class="el" href="classafio__v2__xxx_1_1map__handle.html">map_handle</a>> afio_v2_xxx::map_handle::map </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1section__handle.html">section_handle</a> & </td>
<td class="paramname"><em>section</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> </td>
<td class="paramname"><em>bytes</em> = <code>0</code>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>offset</em> = <code>0</code>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">section_handle::flag </td>
<td class="paramname"><em>_flag</em> = <code>section_handle::flag::read|section_handle::flag::write</code> </td>
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<p>Create a memory mapped view of a backing storage. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">section</td><td>A memory section handle specifying the backing storage to use. </td></tr>
<tr><td class="paramname">bytes</td><td>How many bytes to map (0 = the size of the memory section). Typically will be rounded to a multiple of the page size (see utils::page_sizes()). </td></tr>
<tr><td class="paramname">offset</td><td>The offset into the backing storage to map from. Typically needs to be at least a multiple of the page size (see utils::page_sizes()), on Windows it needs to be a multiple of the kernel memory allocation granularity (typically 64Kb). </td></tr>
<tr><td class="paramname">_flag</td><td>The permissions with which to map the view which are constrained by the permissions of the memory section. <code>flag::none</code> can be useful for reserving virtual address space without committing system resources, use commit() to later change availability of memory.</td></tr>
</table>
</dd>
</dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX mmap() or NtMapViewOfSection() can return. </dd></dl>
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<td class="memname">static result<<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a>> afio_v2_xxx::map_handle::prefetch </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a> </td>
<td class="paramname"><em>region</em></td><td>)</td>
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<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
<div class="fragment"><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  {</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  OUTCOME_TRY(ret, <a class="code" href="classafio__v2__xxx_1_1map__handle.html#ae16cb0af9b96f90f87f42318f7d35e65">prefetch</a>(span<buffer_type>(&region, 1)));</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="keywordflow">return</span> *ret.data();</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  }</div>
<div class="ttc" id="classafio__v2__xxx_1_1map__handle_html_ae16cb0af9b96f90f87f42318f7d35e65"><div class="ttname"><a href="classafio__v2__xxx_1_1map__handle.html#ae16cb0af9b96f90f87f42318f7d35e65">afio_v2_xxx::map_handle::prefetch</a></div><div class="ttdeci">static result< span< buffer_type > > prefetch(span< buffer_type > regions) noexcept</div><div class="ttdoc">Ask the system to begin to asynchronously prefetch the span of memory regions given, returning the regions actually prefetched. Note that on Windows 7 or earlier the system call to implement this was not available, and so you will see an empty span returned. </div></div>
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<td class="memname">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><<a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a>> afio_v2_xxx::io_handle::read </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a> > </td>
<td class="paramname"><em>reqs</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span><span class="mlabel">noexcept</span><span class="mlabel">inherited</span></span> </td>
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<p>Read data from the open handle. </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 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>
</table>
</dd>
</dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX read() can return, <code>errc::timed_out</code>, <code>errc::operation_canceled</code>. <code>errc::not_supported</code> may be 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</dt><dd>The default synchronous implementation in file_handle performs no memory allocation. The asynchronous implementation in async_file_handle performs one calloc and one free. </dd></dl>
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<td class="memname"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1buffer__type.html">buffer_type</a>> afio_v2_xxx::io_handle::read </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>offset</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">char * </td>
<td class="paramname"><em>data</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> </td>
<td class="paramname"><em>bytes</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<td>)</td>
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<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
<div class="fragment"><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  {</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  buffer_type _reqs[1] = {{data, bytes}};</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  io_request<buffers_type> reqs(<a class="code" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a>(_reqs), offset);</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  OUTCOME_TRY(v, <a class="code" href="classafio__v2__xxx_1_1io__handle.html#a71d7636f40607829cacc2c974c4a2a28">read</a>(reqs, d));</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordflow">return</span> *v.data();</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  }</div>
<div class="ttc" id="classafio__v2__xxx_1_1io__handle_html_a70a3c5e6f62efc95db81f831f3b90a2c"><div class="ttname"><a href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">afio_v2_xxx::io_handle::buffers_type</a></div><div class="ttdeci">span< buffer_type > buffers_type</div><div class="ttdoc">The scatter buffers type used by this handle. Guaranteed to be TrivialType apart from construction...</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:76</div></div>
<div class="ttc" id="classafio__v2__xxx_1_1io__handle_html_a71d7636f40607829cacc2c974c4a2a28"><div class="ttname"><a href="classafio__v2__xxx_1_1io__handle.html#a71d7636f40607829cacc2c974c4a2a28">afio_v2_xxx::io_handle::read</a></div><div class="ttdeci">virtual io_result< buffers_type > read(io_request< buffers_type > reqs, deadline d=deadline()) noexcept</div><div class="ttdoc">Read data from the open handle. </div></div>
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<td class="memname">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><<a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a>> afio_v2_xxx::map_handle::read </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a70a3c5e6f62efc95db81f831f3b90a2c">buffers_type</a> > </td>
<td class="paramname"><em>reqs</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<p>Read data from the mapped view. </p>
<dl class="section note"><dt>Note</dt><dd>Because this implementation never copies memory, you can pass in buffers with a null address.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>The buffers read, which will never be the buffers input because they will point into the mapped view. The size of each scatter-gather buffer 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>Ignored. </td></tr>
</table>
</dd>
</dl>
<dl class="section user"><dt>Errors returnable</dt><dd>None, though the various signals and structured exception throws common to using memory maps may occur. </dd></dl>
<dl class="section user"><dt>Memory Allocations</dt><dd>None. </dd></dl>
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<td class="memname">virtual result<void> afio_v2_xxx::handle::set_append_only </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"><em>enable</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span><span class="mlabel">noexcept</span><span class="mlabel">inherited</span></span> </td>
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<p>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</dt><dd>Whatever POSIX fcntl() returns. On Windows nothing is changed on the handle. </dd></dl>
<dl class="section user"><dt>Memory Allocations</dt><dd>No memory allocation. </dd></dl>
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<td class="memname">virtual result<void> afio_v2_xxx::handle::set_kernel_caching </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a6f7e37c73271968271c2342023f58c9e">caching</a> </td>
<td class="paramname"><em>caching</em></td><td>)</td>
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<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span><span class="mlabel">noexcept</span><span class="mlabel">inherited</span></span> </td>
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<p>Changes the kernel cache strategy used by this handle. Note most OSs impose severe restrictions on what can be changed and will error out, it may be easier to simply create a new handle.</p>
<dl class="section warning"><dt>Warning</dt><dd>On Windows this reopens the file, it is no slower than opening the file fresh but equally it is vastly slower than on POSIX.</dd></dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Whatever POSIX fcntl() or ReOpenFile() returns. </dd></dl>
<dl class="section user"><dt>Memory Allocations</dt><dd>No memory allocation. </dd></dl>
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<td class="memname">result<<a class="el" href="classafio__v2__xxx_1_1io__handle_1_1extent__guard.html">extent_guard</a>> afio_v2_xxx::io_handle::try_lock </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>offset</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>bytes</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>exclusive</em> = <code>true</code> </td>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
<div class="fragment"><div class="line"><a name="l00379"></a><span class="lineno"> 379</span> { <span class="keywordflow">return</span> <a class="code" href="classafio__v2__xxx_1_1io__handle.html#a88689b15e6e8b6ce1f945737dee4369e">lock</a>(offset, bytes, exclusive, deadline(std::chrono::seconds(0))); }</div>
<div class="ttc" id="classafio__v2__xxx_1_1io__handle_html_a88689b15e6e8b6ce1f945737dee4369e"><div class="ttname"><a href="classafio__v2__xxx_1_1io__handle.html#a88689b15e6e8b6ce1f945737dee4369e">afio_v2_xxx::io_handle::lock</a></div><div class="ttdeci">virtual result< extent_guard > lock(extent_type offset, extent_type bytes, bool exclusive=true, deadline d=deadline()) noexcept</div><div class="ttdoc">Tries to lock the range of bytes specified for shared or exclusive access. Be aware this passes throu...</div></div>
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<td class="memname">virtual void afio_v2_xxx::io_handle::unlock </td>
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<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>offset</em>, </td>
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<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>bytes</em> </td>
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<p>Unlocks a byte range previously locked. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<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>
</table>
</dd>
</dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX fcntl() can return. </dd></dl>
<dl class="section user"><dt>Memory Allocations</dt><dd>None. </dd></dl>
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<td class="memname">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><<a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a>> afio_v2_xxx::io_handle::write </td>
<td>(</td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__request.html">io_request</a>< <a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a> > </td>
<td class="paramname"><em>reqs</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<td>)</td>
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<p>Write data to the open handle. </p>
<dl class="section warning"><dt>Warning</dt><dd>Depending on the implementation backend, not all of the buffers input may be written and the some buffers at the end of the returned buffers may return with zero bytes 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.</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 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>
</table>
</dd>
</dl>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the values POSIX write() can return, <code>errc::timed_out</code>, <code>errc::operation_canceled</code>. <code>errc::not_supported</code> may be 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</dt><dd>The default synchronous implementation in file_handle performs no memory allocation. The asynchronous implementation in async_file_handle performs one calloc and one free. </dd></dl>
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<td class="memname"><a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><<a class="el" href="structafio__v2__xxx_1_1io__handle_1_1const__buffer__type.html">const_buffer_type</a>> afio_v2_xxx::io_handle::write </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a818fff07c92eaab72532092d1c2a14f9">extent_type</a> </td>
<td class="paramname"><em>offset</em>, </td>
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<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"><em>data</em>, </td>
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<td></td>
<td class="paramtype"><a class="el" href="classafio__v2__xxx_1_1handle.html#a0adf7fa00e23ed561328f473986e9ccc">size_type</a> </td>
<td class="paramname"><em>bytes</em>, </td>
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<td></td>
<td class="paramtype"><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a> </td>
<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<td></td>
<td>)</td>
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<p>This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. </p>
<div class="fragment"><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  {</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  const_buffer_type _reqs[1] = {{data, bytes}};</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  io_request<const_buffers_type> reqs(<a class="code" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a>(_reqs), offset);</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  OUTCOME_TRY(v, <a class="code" href="classafio__v2__xxx_1_1io__handle.html#aefac4710e5617264347f437b04732c01">write</a>(reqs, d));</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">return</span> *v.data();</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  }</div>
<div class="ttc" id="classafio__v2__xxx_1_1io__handle_html_a639b8760b1b98df95e4956f6cc56f6b5"><div class="ttname"><a href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">afio_v2_xxx::io_handle::const_buffers_type</a></div><div class="ttdeci">span< const_buffer_type > const_buffers_type</div><div class="ttdoc">The gather buffers type used by this handle. Guaranteed to be TrivialType apart from construction...</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:78</div></div>
<div class="ttc" id="classafio__v2__xxx_1_1io__handle_html_aefac4710e5617264347f437b04732c01"><div class="ttname"><a href="classafio__v2__xxx_1_1io__handle.html#aefac4710e5617264347f437b04732c01">afio_v2_xxx::io_handle::write</a></div><div class="ttdeci">virtual 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. </div></div>
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<td class="memname">virtual <a class="el" href="structafio__v2__xxx_1_1io__handle_1_1io__result.html">io_result</a><<a class="el" href="classafio__v2__xxx_1_1io__handle.html#a639b8760b1b98df95e4956f6cc56f6b5">const_buffers_type</a>> afio_v2_xxx::map_handle::write </td>
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<td class="paramname"><em>d</em> = <code><a class="el" href="structafio__v2__xxx_1_1deadline.html">deadline</a>()</code> </td>
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<p>Write data to the mapped view. </p>
<dl class="section return"><dt>Returns</dt><dd>The buffers written, which will never be the buffers input because they will point at where the data was copied into the mapped view. The size of each scatter-gather buffer is updated with the number of bytes of that buffer transferred. </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. </td></tr>
<tr><td class="paramname">d</td><td>Ignored. </td></tr>
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<dl class="section user"><dt>Errors returnable</dt><dd>None, though the various signals and structured exception throws common to using memory maps may occur. </dd></dl>
<dl class="section user"><dt>Memory Allocations</dt><dd>None. </dd></dl>
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<td class="memname">result<void> afio_v2_xxx::map_handle::zero_memory </td>
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<p>Zero the memory represented by the buffer. Differs from zero() because it acts on mapped memory, but may call zero() internally.</p>
<p>On Linux, Windows and FreeBSD any full 4Kb pages will be deallocated from the system entirely, including the extents for them in any backing storage. On newer Linux kernels the kernel can additionally swap whole 4Kb pages for freshly zeroed ones making this a very efficient way of zeroing large ranges of memory. </p>
<dl class="section user"><dt>Errors returnable</dt><dd>Any of the errors returnable by madvise() or DiscardVirtualMemory or the zero() function. </dd></dl>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/afio/v2.0/<a class="el" href="map__handle_8hpp.html">map_handle.hpp</a></li>
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