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 <span id="projectnumber">v2.00 late beta</span>
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<a href="#pub-types">Public Types</a> |
<a href="#pub-methods">Public Member Functions</a> |
<a href="#pub-static-methods">Static Public Member Functions</a> |
<a href="#pro-static-methods">Static Protected Member Functions</a> |
<a href="#pro-attribs">Protected Attributes</a> |
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<div class="title">llfio_v2_xxx::section_handle Class Reference</div> </div>
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<p>A handle to a source of mapped memory.
<a href="classllfio__v2__xxx_1_1section__handle.html#details">More...</a></p>
<p><code>#include "map_handle.hpp"</code></p>
<div class="dynheader">
Inheritance diagram for llfio_v2_xxx::section_handle:</div>
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<area href="classllfio__v2__xxx_1_1handle.html" title="A native_handle_type which is managed by the lifetime of this object instance." alt="llfio_v2_xxx::handle" shape="rect" coords="0,0,169,24"/>
</map>
</div></div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a91a4e4110fe6ed6358de00de3ae934d1"><td class="memItemLeft" align="right" valign="top"><a id="a91a4e4110fe6ed6358de00de3ae934d1"></a>
using </td><td class="memItemRight" valign="bottom"><b>extent_type</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">handle::extent_type</a></td></tr>
<tr class="separator:a91a4e4110fe6ed6358de00de3ae934d1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad623089ad47d566d5eeaefe202dbf3a0"><td class="memItemLeft" align="right" valign="top"><a id="ad623089ad47d566d5eeaefe202dbf3a0"></a>
using </td><td class="memItemRight" valign="bottom"><b>size_type</b> = <a class="el" href="classllfio__v2__xxx_1_1handle.html#aed9587571c3fb932adadddc1beeeed58">handle::size_type</a></td></tr>
<tr class="separator:ad623089ad47d566d5eeaefe202dbf3a0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa3930273a2d4cabbac309e0b75701dca"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">mode</a> : unsigned char { <br />
  <b>unchanged</b> = 0,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaa334c4a4c42fdb79d7ebc3e73b517e6f8">mode::none</a> = 2,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaa4daf6d1e8da35af49c33bbe9ee91d79">mode::attr_read</a> = 4,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaa9f56aff64cb748e078ab221474132d19">mode::attr_write</a> = 5,
<br />
  <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaecae13117d6f0584c25a9da6c8f8415e">mode::read</a> = 6,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee">mode::write</a> = 7,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dcaa9516dfb15f51c7ee19a4d46b8c0dbe1d">mode::append</a> = 9
<br />
}</td></tr>
<tr class="memdesc:aa3930273a2d4cabbac309e0b75701dca"><td class="mdescLeft"> </td><td class="mdescRight">The behaviour of the handle: does it read, read and write, or atomic append? <a href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">More...</a><br /></td></tr>
<tr class="separator:aa3930273a2d4cabbac309e0b75701dca"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af0b352d0f273ba6fa70c178b2c2fee42"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">creation</a> : unsigned char { <br />
  <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42aa200dcd6176417e93be2405188ae7cc9">creation::open_existing</a> = 0,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42abba3bc579480e6c94ecd81b7b5923255">creation::only_if_not_exist</a>,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42a8f0339e854eb5321306a443ce9199e1d">creation::if_needed</a>,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42abb872caae430ba70f670508aca38feed">creation::truncate_existing</a>,
<br />
  <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42af7cf95e0f43dc8f79e39ae628c85a11d">creation::always_new</a>
<br />
}</td></tr>
<tr class="memdesc:af0b352d0f273ba6fa70c178b2c2fee42"><td class="mdescLeft"> </td><td class="mdescRight">On opening, do we also create a new file or truncate an existing one? <a href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">More...</a><br /></td></tr>
<tr class="separator:af0b352d0f273ba6fa70c178b2c2fee42"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aecd3a7db6cee3aec07d32fe6f99e6852"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> : unsigned char { <br />
  <b>unchanged</b> = 0,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852a334c4a4c42fdb79d7ebc3e73b517e6f8">caching::none</a> = 1,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852ab8a61dd00ce6fc5888706bda8fab2e98">caching::only_metadata</a> = 2,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852a0fb9cf5f04f61bb6f1151da57ceb1ca1">caching::reads</a> = 3,
<br />
  <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852adec4ecca8ae1593f84eea4656599a693">caching::reads_and_metadata</a> = 5,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852aa181a603769c1f98ad927e7367c7aa51">caching::all</a> = 6,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852a9cd65f46f55fb6a4b198fcee6f0a63c1">caching::safety_barriers</a> = 7,
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852ad5197d93c063a2b1e22d1630a39b7aef">caching::temporary</a> = 8
<br />
}</td></tr>
<tr class="memdesc:aecd3a7db6cee3aec07d32fe6f99e6852"><td class="mdescLeft"> </td><td class="mdescRight">What i/o on the handle may complete immediately due to kernel caching. <a href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">More...</a><br /></td></tr>
<tr class="separator:aecd3a7db6cee3aec07d32fe6f99e6852"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a33481bae57d9ccd0c97946416f9682f3"><td class="memItemLeft" align="right" valign="top"><a id="a33481bae57d9ccd0c97946416f9682f3"></a>
using </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a33481bae57d9ccd0c97946416f9682f3">path_type</a> = filesystem::path</td></tr>
<tr class="memdesc:a33481bae57d9ccd0c97946416f9682f3"><td class="mdescLeft"> </td><td class="mdescRight">The path type used by this handle. <br /></td></tr>
<tr class="separator:a33481bae57d9ccd0c97946416f9682f3"><td class="memSeparator" colspan="2"> </td></tr>
</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:a5405985448afbfe281cbf98ab7bbb3ab"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a5405985448afbfe281cbf98ab7bbb3ab">QUICKCPPLIB_BITFIELD_BEGIN</a> (flag)</td></tr>
<tr class="memdesc:a5405985448afbfe281cbf98ab7bbb3ab"><td class="mdescLeft"> </td><td class="mdescRight">The behaviour of the memory section. <a href="classllfio__v2__xxx_1_1section__handle.html#a5405985448afbfe281cbf98ab7bbb3ab">More...</a><br /></td></tr>
<tr class="separator:a5405985448afbfe281cbf98ab7bbb3ab"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad057ca569878e127389457e80e0f393d"><td class="memItemLeft" align="right" valign="top"><a id="ad057ca569878e127389457e80e0f393d"></a>
 </td><td class="memItemRight" valign="bottom"><b>QUICKCPPLIB_BITFIELD_END</b> (flag)</td></tr>
<tr class="separator:ad057ca569878e127389457e80e0f393d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a967031835185e5ba872a4e584d51c40d"><td class="memItemLeft" align="right" valign="top"><a id="a967031835185e5ba872a4e584d51c40d"></a>
virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a967031835185e5ba872a4e584d51c40d">close</a> () noexcept override</td></tr>
<tr class="memdesc:a967031835185e5ba872a4e584d51c40d"><td class="mdescLeft"> </td><td class="mdescRight">Immediately close the native handle type managed by this handle. <br /></td></tr>
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<tr class="memitem:a34f702e58a35c1eee31f5a5d3e5ec73d"><td class="memItemLeft" align="right" valign="top"><a id="a34f702e58a35c1eee31f5a5d3e5ec73d"></a>
constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a34f702e58a35c1eee31f5a5d3e5ec73d">section_handle</a> ()</td></tr>
<tr class="memdesc:a34f702e58a35c1eee31f5a5d3e5ec73d"><td class="mdescLeft"> </td><td class="mdescRight">Default constructor. <br /></td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a0c81fe2dc73021beab897b66379aef9a">section_handle</a> (flag __flag)</td></tr>
<tr class="memdesc:a0c81fe2dc73021beab897b66379aef9a"><td class="mdescLeft"> </td><td class="mdescRight">Construct a section handle using the given flags. <br /></td></tr>
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<tr class="memitem:a9652c4732314142bd472304f36386ef8"><td class="memItemLeft" align="right" valign="top"><a id="a9652c4732314142bd472304f36386ef8"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a9652c4732314142bd472304f36386ef8">section_handle</a> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> sectionh, <a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> *<a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a680320bd539378d99870d9b2cdedb9c8">backing</a>, <a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> anonymous, flag __flag)</td></tr>
<tr class="memdesc:a9652c4732314142bd472304f36386ef8"><td class="mdescLeft"> </td><td class="mdescRight">Construct a section handle using the given native handle type for the section and the given i/o handle for the backing storage. <br /></td></tr>
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constexpr </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a28bc1b458a57c697b94804fd6c87dcd9">section_handle</a> (<a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:a28bc1b458a57c697b94804fd6c87dcd9"><td class="mdescLeft"> </td><td class="mdescRight">Implicit move construction of section_handle permitted. <br /></td></tr>
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<tr class="memitem:ab3cb03378bf927a2fb6636beb6ca2f20"><td class="memItemLeft" align="right" valign="top"><a id="ab3cb03378bf927a2fb6636beb6ca2f20"></a>
 </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#ab3cb03378bf927a2fb6636beb6ca2f20">section_handle</a> (const <a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> &)=delete</td></tr>
<tr class="memdesc:ab3cb03378bf927a2fb6636beb6ca2f20"><td class="mdescLeft"> </td><td class="mdescRight">No copy construction (use <code>clone()</code>) <br /></td></tr>
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<tr class="memitem:a55daf2f49cf0f182e18e139f6c35668a"><td class="memItemLeft" align="right" valign="top"><a id="a55daf2f49cf0f182e18e139f6c35668a"></a>
<a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a55daf2f49cf0f182e18e139f6c35668a">operator=</a> (<a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> &&o) noexcept</td></tr>
<tr class="memdesc:a55daf2f49cf0f182e18e139f6c35668a"><td class="mdescLeft"> </td><td class="mdescRight">Move assignment of section_handle permitted. <br /></td></tr>
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<tr class="memitem:a5435021920a220ef8d1e244036c8219b"><td class="memItemLeft" align="right" valign="top"><a id="a5435021920a220ef8d1e244036c8219b"></a>
<a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a5435021920a220ef8d1e244036c8219b">operator=</a> (const <a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> &)=delete</td></tr>
<tr class="memdesc:a5435021920a220ef8d1e244036c8219b"><td class="mdescLeft"> </td><td class="mdescRight">No copy assignment. <br /></td></tr>
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<tr class="memitem:a2bad3e9b5baf82d9ee7f791f4c3b4733"><td class="memItemLeft" align="right" valign="top"><a id="a2bad3e9b5baf82d9ee7f791f4c3b4733"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a2bad3e9b5baf82d9ee7f791f4c3b4733">swap</a> (<a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a2bad3e9b5baf82d9ee7f791f4c3b4733"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br /></td></tr>
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<tr class="memitem:a99bb38a023cb0cb486e6210485cc1ca4"><td class="memItemLeft" align="right" valign="top"><a id="a99bb38a023cb0cb486e6210485cc1ca4"></a>
flag </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a99bb38a023cb0cb486e6210485cc1ca4">section_flags</a> () const noexcept</td></tr>
<tr class="memdesc:a99bb38a023cb0cb486e6210485cc1ca4"><td class="mdescLeft"> </td><td class="mdescRight">Returns the memory section's flags. <br /></td></tr>
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<tr class="memitem:a3b82e2db8c45ecc45a860fac912f6c82"><td class="memItemLeft" align="right" valign="top"><a id="a3b82e2db8c45ecc45a860fac912f6c82"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a3b82e2db8c45ecc45a860fac912f6c82">is_nvram</a> () const noexcept</td></tr>
<tr class="memdesc:a3b82e2db8c45ecc45a860fac912f6c82"><td class="mdescLeft"> </td><td class="mdescRight">True if the section reflects non-volatile RAM. <br /></td></tr>
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<tr class="memitem:a680320bd539378d99870d9b2cdedb9c8"><td class="memItemLeft" align="right" valign="top"><a id="a680320bd539378d99870d9b2cdedb9c8"></a>
<a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a680320bd539378d99870d9b2cdedb9c8">backing</a> () const noexcept</td></tr>
<tr class="memdesc:a680320bd539378d99870d9b2cdedb9c8"><td class="mdescLeft"> </td><td class="mdescRight">Returns the borrowed handle backing this section, if any. <br /></td></tr>
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void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a85635c700f2778280481598393c24c00">set_backing</a> (<a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> *fh) noexcept</td></tr>
<tr class="memdesc:a85635c700f2778280481598393c24c00"><td class="mdescLeft"> </td><td class="mdescRight">Sets the borrowed handle backing this section, if any. <br /></td></tr>
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<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#aea14a4f834500e412db39efd998f438a">backing_native_handle</a> () const noexcept</td></tr>
<tr class="memdesc:aea14a4f834500e412db39efd998f438a"><td class="mdescLeft"> </td><td class="mdescRight">Returns the borrowed native handle backing this section. <br /></td></tr>
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result< <a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a137acb9e2bbec111072ef357236e9441">length</a> () const noexcept</td></tr>
<tr class="memdesc:a137acb9e2bbec111072ef357236e9441"><td class="mdescLeft"> </td><td class="mdescRight">Return the current length of the memory section. <br /></td></tr>
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<tr class="memitem:aa4d0beac304a5ae9d29441819a829b80"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#aa4d0beac304a5ae9d29441819a829b80">truncate</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> newsize=0) noexcept</td></tr>
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<tr class="memitem:a4716696b8700953889006251e0678aa4"><td class="memItemLeft" align="right" valign="top"><a id="a4716696b8700953889006251e0678aa4"></a>
void </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4716696b8700953889006251e0678aa4">swap</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> &o) noexcept</td></tr>
<tr class="memdesc:a4716696b8700953889006251e0678aa4"><td class="mdescLeft"> </td><td class="mdescRight">Swap with another instance. <br /></td></tr>
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<tr class="memitem:a00a85eec5a41f7edb2c574d40cf04535"><td class="memItemLeft" align="right" valign="top">virtual result< <a class="el" href="classllfio__v2__xxx_1_1handle.html#a33481bae57d9ccd0c97946416f9682f3">path_type</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a00a85eec5a41f7edb2c574d40cf04535">current_path</a> () const noexcept</td></tr>
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<tr class="memitem:aeea4389189021b94dde6d8f2c3ccc5b3"><td class="memItemLeft" align="right" valign="top">result< <a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#aeea4389189021b94dde6d8f2c3ccc5b3">clone</a> () const noexcept</td></tr>
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<tr class="memitem:a1d273e38c061eb11f5012f624e9a202e"><td class="memItemLeft" align="right" valign="top"><a id="a1d273e38c061eb11f5012f624e9a202e"></a>
virtual <a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a1d273e38c061eb11f5012f624e9a202e">release</a> () noexcept</td></tr>
<tr class="memdesc:a1d273e38c061eb11f5012f624e9a202e"><td class="mdescLeft"> </td><td class="mdescRight">Release the native handle type managed by this handle. <br /></td></tr>
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<tr class="memitem:a5c7f6a0a8ffdea22763c75a9319ba0c2"><td class="memItemLeft" align="right" valign="top"><a id="a5c7f6a0a8ffdea22763c75a9319ba0c2"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a5c7f6a0a8ffdea22763c75a9319ba0c2">is_valid</a> () const noexcept</td></tr>
<tr class="memdesc:a5c7f6a0a8ffdea22763c75a9319ba0c2"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is valid (and usually open) <br /></td></tr>
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<tr class="memitem:a97e0884c27147b4929be98961b8e9254"><td class="memItemLeft" align="right" valign="top"><a id="a97e0884c27147b4929be98961b8e9254"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a97e0884c27147b4929be98961b8e9254">is_readable</a> () const noexcept</td></tr>
<tr class="memdesc:a97e0884c27147b4929be98961b8e9254"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is readable. <br /></td></tr>
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<tr class="memitem:a211fee447a47bdeb5424a2a5ae1de852"><td class="memItemLeft" align="right" valign="top"><a id="a211fee447a47bdeb5424a2a5ae1de852"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a211fee447a47bdeb5424a2a5ae1de852">is_writable</a> () const noexcept</td></tr>
<tr class="memdesc:a211fee447a47bdeb5424a2a5ae1de852"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is writable. <br /></td></tr>
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<tr class="memitem:ac3aa3dc009822c0e437f317864534feb"><td class="memItemLeft" align="right" valign="top"><a id="ac3aa3dc009822c0e437f317864534feb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac3aa3dc009822c0e437f317864534feb">is_append_only</a> () const noexcept</td></tr>
<tr class="memdesc:ac3aa3dc009822c0e437f317864534feb"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle is append only. <br /></td></tr>
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<tr class="memitem:a101620e9fff0c0e8c346af0e9de58b6a"><td class="memItemLeft" align="right" valign="top">virtual result< void > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a101620e9fff0c0e8c346af0e9de58b6a">set_append_only</a> (bool enable) noexcept</td></tr>
<tr class="memdesc:a101620e9fff0c0e8c346af0e9de58b6a"><td class="mdescLeft"> </td><td class="mdescRight">EXTENSION: Changes whether this handle is append only or not. <a href="classllfio__v2__xxx_1_1handle.html#a101620e9fff0c0e8c346af0e9de58b6a">More...</a><br /></td></tr>
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<tr class="memitem:ade2416b9154d1e56937c99cd514324f8"><td class="memItemLeft" align="right" valign="top"><a id="ade2416b9154d1e56937c99cd514324f8"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ade2416b9154d1e56937c99cd514324f8">is_multiplexable</a> () const noexcept</td></tr>
<tr class="memdesc:ade2416b9154d1e56937c99cd514324f8"><td class="mdescLeft"> </td><td class="mdescRight">True if multiplexable. <br /></td></tr>
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<tr class="memitem:a501aa723172f6852e82738b0969278ae"><td class="memItemLeft" align="right" valign="top"><a id="a501aa723172f6852e82738b0969278ae"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a501aa723172f6852e82738b0969278ae">is_nonblocking</a> () const noexcept</td></tr>
<tr class="memdesc:a501aa723172f6852e82738b0969278ae"><td class="mdescLeft"> </td><td class="mdescRight">True if nonblocking. <br /></td></tr>
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<tr class="memitem:a695ce0ed1606d540cfa452790ea71632"><td class="memItemLeft" align="right" valign="top"><a id="a695ce0ed1606d540cfa452790ea71632"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a695ce0ed1606d540cfa452790ea71632">is_seekable</a> () const noexcept</td></tr>
<tr class="memdesc:a695ce0ed1606d540cfa452790ea71632"><td class="mdescLeft"> </td><td class="mdescRight">True if seekable. <br /></td></tr>
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<tr class="memitem:a751e912d8dab755ea969a418c1d544eb"><td class="memItemLeft" align="right" valign="top"><a id="a751e912d8dab755ea969a418c1d544eb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a751e912d8dab755ea969a418c1d544eb">requires_aligned_io</a> () const noexcept</td></tr>
<tr class="memdesc:a751e912d8dab755ea969a418c1d544eb"><td class="mdescLeft"> </td><td class="mdescRight">True if requires aligned i/o. <br /></td></tr>
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<tr class="memitem:a7751fbb4b1aff527f469412ea33116ed"><td class="memItemLeft" align="right" valign="top"><a id="a7751fbb4b1aff527f469412ea33116ed"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a7751fbb4b1aff527f469412ea33116ed">is_regular</a> () const noexcept</td></tr>
<tr class="memdesc:a7751fbb4b1aff527f469412ea33116ed"><td class="mdescLeft"> </td><td class="mdescRight">True if a regular file or device. <br /></td></tr>
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<tr class="memitem:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="memItemLeft" align="right" valign="top"><a id="a4ca48bdcd6d6bf8b41d0cebb304fe9ce"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ca48bdcd6d6bf8b41d0cebb304fe9ce">is_directory</a> () const noexcept</td></tr>
<tr class="memdesc:a4ca48bdcd6d6bf8b41d0cebb304fe9ce"><td class="mdescLeft"> </td><td class="mdescRight">True if a directory. <br /></td></tr>
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<tr class="memitem:ae0d5de068f71628e9491c5669f89dca0"><td class="memItemLeft" align="right" valign="top"><a id="ae0d5de068f71628e9491c5669f89dca0"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ae0d5de068f71628e9491c5669f89dca0">is_symlink</a> () const noexcept</td></tr>
<tr class="memdesc:ae0d5de068f71628e9491c5669f89dca0"><td class="mdescLeft"> </td><td class="mdescRight">True if a symlink. <br /></td></tr>
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<tr class="memitem:ac52242425f6e71c3fddcb6cdbe2c3b4e"><td class="memItemLeft" align="right" valign="top"><a id="ac52242425f6e71c3fddcb6cdbe2c3b4e"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac52242425f6e71c3fddcb6cdbe2c3b4e">is_pipe</a> () const noexcept</td></tr>
<tr class="memdesc:ac52242425f6e71c3fddcb6cdbe2c3b4e"><td class="mdescLeft"> </td><td class="mdescRight">True if a pipe. <br /></td></tr>
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<tr class="memitem:ac9280ab1e6f2a65bc73ee0cba5a8deea"><td class="memItemLeft" align="right" valign="top"><a id="ac9280ab1e6f2a65bc73ee0cba5a8deea"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ac9280ab1e6f2a65bc73ee0cba5a8deea">is_socket</a> () const noexcept</td></tr>
<tr class="memdesc:ac9280ab1e6f2a65bc73ee0cba5a8deea"><td class="mdescLeft"> </td><td class="mdescRight">True if a socket. <br /></td></tr>
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<tr class="memitem:a018de0f7c177e3cff239016d14582e9a"><td class="memItemLeft" align="right" valign="top"><a id="a018de0f7c177e3cff239016d14582e9a"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a018de0f7c177e3cff239016d14582e9a">is_multiplexer</a> () const noexcept</td></tr>
<tr class="memdesc:a018de0f7c177e3cff239016d14582e9a"><td class="mdescLeft"> </td><td class="mdescRight">True if a multiplexer like BSD kqueues, Linux epoll or Windows IOCP. <br /></td></tr>
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<tr class="memitem:ade0d0e05b844e77f425669da87bf48bb"><td class="memItemLeft" align="right" valign="top"><a id="ade0d0e05b844e77f425669da87bf48bb"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#ade0d0e05b844e77f425669da87bf48bb">is_process</a> () const noexcept</td></tr>
<tr class="memdesc:ade0d0e05b844e77f425669da87bf48bb"><td class="mdescLeft"> </td><td class="mdescRight">True if a process. <br /></td></tr>
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<tr class="memitem:a354c9168af7759f7151a071c1e1b7b19"><td class="memItemLeft" align="right" valign="top"><a id="a354c9168af7759f7151a071c1e1b7b19"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a354c9168af7759f7151a071c1e1b7b19">is_section</a> () const noexcept</td></tr>
<tr class="memdesc:a354c9168af7759f7151a071c1e1b7b19"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory section. <br /></td></tr>
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<tr class="memitem:a028fbead3b3c4d4eed2da7fa51c75036"><td class="memItemLeft" align="right" valign="top"><a id="a028fbead3b3c4d4eed2da7fa51c75036"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a028fbead3b3c4d4eed2da7fa51c75036">is_allocation</a> () const noexcept</td></tr>
<tr class="memdesc:a028fbead3b3c4d4eed2da7fa51c75036"><td class="mdescLeft"> </td><td class="mdescRight">True if a memory allocation. <br /></td></tr>
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<tr class="memitem:a90bf8668df002dac5a7d9397486b2946"><td class="memItemLeft" align="right" valign="top"><a id="a90bf8668df002dac5a7d9397486b2946"></a>
<a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a90bf8668df002dac5a7d9397486b2946">kernel_caching</a> () const noexcept</td></tr>
<tr class="memdesc:a90bf8668df002dac5a7d9397486b2946"><td class="mdescLeft"> </td><td class="mdescRight">Kernel cache strategy used by this handle. <br /></td></tr>
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<tr class="memitem:a7126a726b2a06e4c1eca1a94c41163ff"><td class="memItemLeft" align="right" valign="top"><a id="a7126a726b2a06e4c1eca1a94c41163ff"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a7126a726b2a06e4c1eca1a94c41163ff">are_reads_from_cache</a> () const noexcept</td></tr>
<tr class="memdesc:a7126a726b2a06e4c1eca1a94c41163ff"><td class="mdescLeft"> </td><td class="mdescRight">True if the handle uses the kernel page cache for reads. <br /></td></tr>
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<tr class="memitem:a8036792f332459064172d7b0cfaee3cf"><td class="memItemLeft" align="right" valign="top"><a id="a8036792f332459064172d7b0cfaee3cf"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a8036792f332459064172d7b0cfaee3cf">are_writes_durable</a> () const noexcept</td></tr>
<tr class="memdesc:a8036792f332459064172d7b0cfaee3cf"><td class="mdescLeft"> </td><td class="mdescRight">True if writes are safely on storage on completion. <br /></td></tr>
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<tr class="memitem:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="memItemLeft" align="right" valign="top"><a id="a0a2a5896f5e373fa032cdae1c1fff2c1"></a>
bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a0a2a5896f5e373fa032cdae1c1fff2c1">are_safety_barriers_issued</a> () const noexcept</td></tr>
<tr class="memdesc:a0a2a5896f5e373fa032cdae1c1fff2c1"><td class="mdescLeft"> </td><td class="mdescRight">True if issuing safety fsyncs is on. <br /></td></tr>
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<tr class="memitem:a013936bc1254b1a47567fe29698d1b1c"><td class="memItemLeft" align="right" valign="top"><a id="a013936bc1254b1a47567fe29698d1b1c"></a>
flag </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a013936bc1254b1a47567fe29698d1b1c">flags</a> () const noexcept</td></tr>
<tr class="memdesc:a013936bc1254b1a47567fe29698d1b1c"><td class="mdescLeft"> </td><td class="mdescRight">The flags this handle was opened with. <br /></td></tr>
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<tr class="memitem:a942b0d276c9f20fe41baab679b88fe72"><td class="memItemLeft" align="right" valign="top"><a id="a942b0d276c9f20fe41baab679b88fe72"></a>
<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a942b0d276c9f20fe41baab679b88fe72">native_handle</a> () const noexcept</td></tr>
<tr class="memdesc:a942b0d276c9f20fe41baab679b88fe72"><td class="mdescLeft"> </td><td class="mdescRight">The native handle used by this handle. <br /></td></tr>
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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:a00db3d1bbffbdb4237401568c441da21"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a00db3d1bbffbdb4237401568c441da21">section</a> (<a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> &<a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a680320bd539378d99870d9b2cdedb9c8">backing</a>, <a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> maximum_size, flag _flag) noexcept</td></tr>
<tr class="memdesc:a00db3d1bbffbdb4237401568c441da21"><td class="mdescLeft"> </td><td class="mdescRight">Create a memory section backed by a file. <a href="classllfio__v2__xxx_1_1section__handle.html#a00db3d1bbffbdb4237401568c441da21">More...</a><br /></td></tr>
<tr class="separator:a00db3d1bbffbdb4237401568c441da21"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa9922be0637718ae8c84d4a3c06a9eaf"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#aa9922be0637718ae8c84d4a3c06a9eaf">section</a> (<a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> &<a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a680320bd539378d99870d9b2cdedb9c8">backing</a>, <a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> bytes=0) noexcept</td></tr>
<tr class="memdesc:aa9922be0637718ae8c84d4a3c06a9eaf"><td class="mdescLeft"> </td><td class="mdescRight">Create a memory section backed by a file. <a href="classllfio__v2__xxx_1_1section__handle.html#aa9922be0637718ae8c84d4a3c06a9eaf">More...</a><br /></td></tr>
<tr class="separator:aa9922be0637718ae8c84d4a3c06a9eaf"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8f36f6c6684010c729c78a34645ba3aa"><td class="memItemLeft" align="right" valign="top">static result< <a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classllfio__v2__xxx_1_1section__handle.html#a8f36f6c6684010c729c78a34645ba3aa">section</a> (<a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> bytes, const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> &dirh=<a class="el" href="namespacellfio__v2__xxx_1_1path__discovery.html#a2dd74ea752f3f511d58ccccdcac7f4fd">path_discovery::storage_backed_temporary_files_directory</a>(), flag _flag=flag::read|flag::write) noexcept</td></tr>
<tr class="memdesc:a8f36f6c6684010c729c78a34645ba3aa"><td class="mdescLeft"> </td><td class="mdescRight">Create a memory section backed by an anonymous, managed file. <a href="classllfio__v2__xxx_1_1section__handle.html#a8f36f6c6684010c729c78a34645ba3aa">More...</a><br /></td></tr>
<tr class="separator:a8f36f6c6684010c729c78a34645ba3aa"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-static-methods"></a>
Static Protected Member Functions</h2></td></tr>
<tr class="memitem:a1dd1abc0bd1fa1f10782301dddf802b7"><td class="memItemLeft" align="right" valign="top"><a id="a1dd1abc0bd1fa1f10782301dddf802b7"></a>
static constexpr void </td><td class="memItemRight" valign="bottom"><b>_set_caching</b> (<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> &nativeh, <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a> <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">caching</a>) noexcept</td></tr>
<tr class="separator:a1dd1abc0bd1fa1f10782301dddf802b7"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pro-attribs"></a>
Protected Attributes</h2></td></tr>
<tr class="memitem:a5b3323b6f5554b863c7f104de9519c86"><td class="memItemLeft" align="right" valign="top"><a id="a5b3323b6f5554b863c7f104de9519c86"></a>
<a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> * </td><td class="memItemRight" valign="bottom"><b>_backing</b> {nullptr}</td></tr>
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<tr class="memitem:a508cd333b972b87a6e0dd63c4d05d30b"><td class="memItemLeft" align="right" valign="top"><a id="a508cd333b972b87a6e0dd63c4d05d30b"></a>
<a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> </td><td class="memItemRight" valign="bottom"><b>_anonymous</b></td></tr>
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<tr class="memitem:aff579de98516b809327d4443ad8eb84a"><td class="memItemLeft" align="right" valign="top"><a id="aff579de98516b809327d4443ad8eb84a"></a>
flag </td><td class="memItemRight" valign="bottom"><b>_flag</b> {flag::none}</td></tr>
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<tr class="memitem:a1d6911771ac743fd9d64063c12429deb"><td class="memItemLeft" align="right" valign="top"><a id="a1d6911771ac743fd9d64063c12429deb"></a>
<a class="el" href="structllfio__v2__xxx_1_1native__handle__type.html">native_handle_type</a> </td><td class="memItemRight" valign="bottom"><b>_v</b></td></tr>
<tr class="separator:a1d6911771ac743fd9d64063c12429deb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad758cf1eb2e0b4c63583eab05e7f6820"><td class="memItemLeft" align="right" valign="top"><a id="ad758cf1eb2e0b4c63583eab05e7f6820"></a>
flag </td><td class="memItemRight" valign="bottom"><b>_flags</b> {flag::none}</td></tr>
<tr class="separator:ad758cf1eb2e0b4c63583eab05e7f6820"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>A handle to a source of mapped memory. </p>
<p>There are two configurations of section handle, one where the user supplies the file backing for the section, and the other where an internal file descriptor to an unnamed inode in a tmpfs or ramfs based temporary directory is kept and managed. The latter is merely a convenience for creating an anonymous source of memory which can be resized whilst preserving contents: see <code>algorithm::trivial_vector<T></code>.</p>
<p>On Windows the native handle of this handle is that of the NT kernel section object. On POSIX it is a cloned file descriptor of the backing storage if there is backing storage, else it will be the aforementioned file descriptor to an unnamed inode. </p>
</div><h2 class="groupheader">Member Enumeration Documentation</h2>
<a id="aecd3a7db6cee3aec07d32fe6f99e6852"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aecd3a7db6cee3aec07d32fe6f99e6852">◆ </a></span>caching</h2>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
<tr>
<td class="mlabels-left">
<table class="memname">
<tr>
<td class="memname">enum <a class="el" href="classllfio__v2__xxx_1_1handle.html#aecd3a7db6cee3aec07d32fe6f99e6852">llfio_v2_xxx::handle::caching</a> : unsigned char</td>
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</td>
<td class="mlabels-right">
<span class="mlabels"><span class="mlabel">strong</span><span class="mlabel">inherited</span></span> </td>
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</div><div class="memdoc">
<p>What i/o on the handle may complete immediately due to kernel caching. </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852a334c4a4c42fdb79d7ebc3e73b517e6f8"></a>none </td><td class="fielddoc"><p>No caching whatsoever, all reads and writes come from storage (i.e. <code>O_DIRECT|O_SYNC</code>). Align all i/o to 4Kb boundaries for this to work. <code>disable_safety_barriers</code> can be used here. </p>
</td></tr>
<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852ab8a61dd00ce6fc5888706bda8fab2e98"></a>only_metadata </td><td class="fielddoc"><p>Cache reads and writes of metadata but avoid caching data (<code>O_DIRECT</code>), thus i/o here does not affect other cached data for other handles. Align all i/o to 4Kb boundaries for this to work. </p>
</td></tr>
<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852a0fb9cf5f04f61bb6f1151da57ceb1ca1"></a>reads </td><td class="fielddoc"><p>Cache reads only. Writes of data and metadata do not complete until reaching storage (<code>O_SYNC</code>). <code>disable_safety_barriers</code> can be used here. </p>
</td></tr>
<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852adec4ecca8ae1593f84eea4656599a693"></a>reads_and_metadata </td><td class="fielddoc"><p>Cache reads and writes of metadata, but writes of data do not complete until reaching storage (<code>O_DSYNC</code>). <code>disable_safety_barriers</code> can be used here. </p>
</td></tr>
<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852aa181a603769c1f98ad927e7367c7aa51"></a>all </td><td class="fielddoc"><p>Cache reads and writes of data and metadata so they complete immediately, sending writes to storage at some point when the kernel decides (this is the default file system caching on a system). </p>
</td></tr>
<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852a9cd65f46f55fb6a4b198fcee6f0a63c1"></a>safety_barriers </td><td class="fielddoc"><p>Cache reads and writes of data and metadata so they complete immediately, but issue safety barriers at certain points. See documentation for <code>disable_safety_barriers</code>. </p>
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<tr><td class="fieldname"><a id="aecd3a7db6cee3aec07d32fe6f99e6852ad5197d93c063a2b1e22d1630a39b7aef"></a>temporary </td><td class="fielddoc"><p>Cache reads and writes of data and metadata so they complete immediately, only sending any updates to storage on last handle close in the system or if memory becomes tight as this file is expected to be temporary (Windows and FreeBSD only). </p>
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<div class="fragment"><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  : <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <span class="comment">// bit 0 set means safety barriers enabled</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  unchanged = 0,</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  none = 1, <span class="comment">//!< No caching whatsoever, all reads and writes come from storage (i.e. <tt>O_DIRECT|O_SYNC</tt>). Align all i/o to 4Kb boundaries for this to work. <tt>disable_safety_barriers</tt> can be used here.</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"></span> only_metadata = 2, <span class="comment">//!< Cache reads and writes of metadata but avoid caching data (<tt>O_DIRECT</tt>), thus i/o here does not affect other cached data for other handles. Align all i/o to 4Kb boundaries for this to work.</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"></span> reads = 3, <span class="comment">//!< Cache reads only. Writes of data and metadata do not complete until reaching storage (<tt>O_SYNC</tt>). <tt>disable_safety_barriers</tt> can be used here.</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"></span> reads_and_metadata = 5, <span class="comment">//!< Cache reads and writes of metadata, but writes of data do not complete until reaching storage (<tt>O_DSYNC</tt>). <tt>disable_safety_barriers</tt> can be used here.</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"></span> all = 6, <span class="comment">//!< Cache reads and writes of data and metadata so they complete immediately, sending writes to storage at some point when the kernel decides (this is the default file system caching on a system).</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"></span> safety_barriers = 7, <span class="comment">//!< Cache reads and writes of data and metadata so they complete immediately, but issue safety barriers at certain points. See documentation for <tt>disable_safety_barriers</tt>.</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"></span> temporary = 8 <span class="comment">//!< Cache reads and writes of data and metadata so they complete immediately, only sending any updates to storage on last handle close in the system or if memory becomes tight as this file is expected to be temporary (Windows and FreeBSD only).</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"></span> <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  };</div>
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<td class="memname">enum <a class="el" href="classllfio__v2__xxx_1_1handle.html#af0b352d0f273ba6fa70c178b2c2fee42">llfio_v2_xxx::handle::creation</a> : unsigned char</td>
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<p>On opening, do we also create a new file or truncate an existing one? </p>
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<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42aa200dcd6176417e93be2405188ae7cc9"></a>open_existing </td><td class="fielddoc"><p>Filesystem entry must already exist. </p>
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<tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42abba3bc579480e6c94ecd81b7b5923255"></a>only_if_not_exist </td><td class="fielddoc"><p>Filesystem entry must NOT exist, and is atomically created by the success of this operation. </p>
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<tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42a8f0339e854eb5321306a443ce9199e1d"></a>if_needed </td><td class="fielddoc"><p>If filesystem entry exists that is used, else one is created. </p>
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<tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42abb872caae430ba70f670508aca38feed"></a>truncate_existing </td><td class="fielddoc"><p>Filesystem entry must already exist. It is atomically truncated on open, leaving creation date and unique identifier unmodified. </p>
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<tr><td class="fieldname"><a id="af0b352d0f273ba6fa70c178b2c2fee42af7cf95e0f43dc8f79e39ae628c85a11d"></a>always_new </td><td class="fielddoc"><p>If filesystem entry exists, it is atomically replaced with a new inode, else a new entry is created. </p>
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<div class="fragment"><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  : <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  {</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  open_existing = 0, <span class="comment">//!< Filesystem entry must already exist</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"></span> only_if_not_exist, <span class="comment">//!< Filesystem entry must NOT exist, and is atomically created by the success of this operation</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"></span> if_needed, <span class="comment">//!< If filesystem entry exists that is used, else one is created</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"></span> truncate_existing, <span class="comment">//!< Filesystem entry must already exist. It is atomically truncated on open, leaving creation date and unique identifier unmodified.</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"></span> always_new <span class="comment">//!< If filesystem entry exists, it is atomically replaced with a new inode, else a new entry is created.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"></span> <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  };</div>
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<td class="memname">enum <a class="el" href="classllfio__v2__xxx_1_1handle.html#aa3930273a2d4cabbac309e0b75701dca">llfio_v2_xxx::handle::mode</a> : unsigned char</td>
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<p>The behaviour of the handle: does it read, read and write, or atomic append? </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaa334c4a4c42fdb79d7ebc3e73b517e6f8"></a>none </td><td class="fielddoc"><p>No ability to read or write anything, but can synchronise (SYNCHRONIZE or 0) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaaa4daf6d1e8da35af49c33bbe9ee91d79"></a>attr_read </td><td class="fielddoc"><p>Ability to read attributes (FILE_READ_ATTRIBUTES|SYNCHRONIZE or O_RDONLY) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaa9f56aff64cb748e078ab221474132d19"></a>attr_write </td><td class="fielddoc"><p>Ability to read and write attributes (FILE_READ_ATTRIBUTES|FILE_WRITE_ATTRIBUTES|SYNCHRONIZE or O_RDONLY) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaaecae13117d6f0584c25a9da6c8f8415e"></a>read </td><td class="fielddoc"><p>Ability to read (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|SYNCHRONISE or O_RDONLY) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaaefb2a684e4afb7d55e6147fbe5a332ee"></a>write </td><td class="fielddoc"><p>Ability to read and write (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|FILE_WRITE_DATA|FILE_WRITE_ATTRIBUTES|FILE_WRITE_EA|FILE_APPEND_DATA|SYNCHRONISE or O_RDWR) </p>
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<tr><td class="fieldname"><a id="aa3930273a2d4cabbac309e0b75701dcaa9516dfb15f51c7ee19a4d46b8c0dbe1d"></a>append </td><td class="fielddoc"><p>All mainstream OSs and CIFS guarantee this is atomic with respect to all other appenders (FILE_APPEND_DATA|SYNCHRONISE or O_APPEND) </p>
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<div class="fragment"><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  : <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <span class="comment">// bit 0 set means writable</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  unchanged = 0,</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  none = 2, <span class="comment">//!< No ability to read or write anything, but can synchronise (SYNCHRONIZE or 0)</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"></span> attr_read = 4, <span class="comment">//!< Ability to read attributes (FILE_READ_ATTRIBUTES|SYNCHRONIZE or O_RDONLY)</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"></span> attr_write = 5, <span class="comment">//!< Ability to read and write attributes (FILE_READ_ATTRIBUTES|FILE_WRITE_ATTRIBUTES|SYNCHRONIZE or O_RDONLY)</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"></span> <a class="code" href="namespacellfio__v2__xxx.html#af678f58d20e1f0962ff0744150342683">read</a> = 6, <span class="comment">//!< Ability to read (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|SYNCHRONISE or O_RDONLY)</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"></span> <a class="code" href="namespacellfio__v2__xxx.html#a5a8908704c9988bbecc69c2359e6fd4a">write</a> = 7, <span class="comment">//!< Ability to read and write (READ_CONTROL|FILE_READ_DATA|FILE_READ_ATTRIBUTES|FILE_READ_EA|FILE_WRITE_DATA|FILE_WRITE_ATTRIBUTES|FILE_WRITE_EA|FILE_APPEND_DATA|SYNCHRONISE or O_RDWR)</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"></span> append = 9 <span class="comment">//!< All mainstream OSs and CIFS guarantee this is atomic with respect to all other appenders (FILE_APPEND_DATA|SYNCHRONISE or O_APPEND)</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"></span> <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  };</div>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#aeea4389189021b94dde6d8f2c3ccc5b3">◆ </a></span>clone()</h2>
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<td class="memname">result<<a class="el" href="classllfio__v2__xxx_1_1handle.html">handle</a>> llfio_v2_xxx::handle::clone </td>
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<p>Clone this handle (copy constructor is disabled to avoid accidental copying)</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup() or DuplicateHandle() can return.</dt><dd></dd></dl>
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<td class="memname">virtual result<<a class="el" href="classllfio__v2__xxx_1_1handle.html#a33481bae57d9ccd0c97946416f9682f3">path_type</a>> llfio_v2_xxx::handle::current_path </td>
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<p>Returns the current path of the open handle as said by the operating system. Note that you are NOT guaranteed that any path refreshed bears any resemblance to the original, some operating systems will return some different path which still reaches the same inode via some other route e.g. hardlinks, dereferenced symbolic links, etc. Windows and Linux correctly track changes to the specific path the handle was opened with, not getting confused by other hard links. MacOS nearly gets it right, but under some circumstances e.g. renaming may switch to a different hard link's path which is almost certainly a bug.</p>
<p>If LLFIO was not able to determine the current path for this open handle e.g. the inode has been unlinked, it returns an empty path. Be aware that FreeBSD can return an empty (deleted) path for file inodes no longer cached by the kernel path cache, LLFIO cannot detect the difference. FreeBSD will also return any path leading to the inode if it is hard linked. FreeBSD does implement path retrieval for directory inodes correctly however, and see <code>algorithm::cached_parent_handle_adapter<T></code> for a handle adapter which makes use of that.</p>
<p>On Linux if <code>/proc</code> is not mounted, this call fails with an error. All APIs in LLFIO which require the use of <code>current_path()</code> can be told to not use it e.g. <code>flag::disable_safety_unlinks</code>. It is up to you to detect if <code>current_path()</code> is not working, and to change how you call LLFIO appropriately.</p>
<p>On Windows, you will almost certainly get back a path of the form <code>\!!\Device\HarddiskVolume10\Users\ned\...</code>. See <code>path_view</code> for what all the path prefix sequences mean, but to summarise the <code>\!!\</code> prefix is LLFIO-only and will not be accepted by other Windows APIs. Pass LLFIO derived paths through the function <code>to_win32_path()</code> to Win32-ise them. This function is also available on Linux where it does nothing, so you can use it in portable code.</p>
<dl class="section warning"><dt>Warning</dt><dd>This call is expensive, it always asks the kernel for the current path, and no checking is done to ensure what the kernel returns is accurate or even sensible. Be aware that despite these precautions, paths are unstable and <b>can change randomly at any moment</b>. Most code written to use absolute file systems paths is <b>racy</b>, so don't do it, use <code>path_handle</code> to fix a base location on the file system and work from that anchor instead!</dd></dl>
<dl class="section user"><dt>Memory Allocations\n At least one malloc for the path_type, likely several more.</dt><dd></dd></dl>
<dl class="section see"><dt>See also</dt><dd><code>algorithm::cached_parent_handle_adapter<T></code> which overrides this with an implementation based on retrieving the current path of a cached handle to the parent directory. On platforms with instability or failure to retrieve the correct current path for regular files, the cached parent handle adapter works around the problem by taking advantage of directory inodes not having the same instability problems on any platform. </dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1symlink__handle.html#aea44ed050acfd8e4f9dec59ff194c746">llfio_v2_xxx::symlink_handle</a>, and <a class="el" href="classllfio__v2__xxx_1_1process__handle.html#a8ed1f5dda9dcf9d59710acc9c91df943">llfio_v2_xxx::process_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a5405985448afbfe281cbf98ab7bbb3ab">◆ </a></span>QUICKCPPLIB_BITFIELD_BEGIN()</h2>
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<p>The behaviour of the memory section. </p>
<p>< No flags</p>
<p>< Memory views can be read</p>
<p>< Memory views can be written</p>
<p>< Memory views can be copy on written</p>
<p>< Memory views can execute code</p>
<p>< Don't allocate space for this memory in the system immediately</p>
<p>< Prefault, as if by reading every page, any views of memory upon creation.</p>
<p>< The backing storage is in fact an executable program binary.</p>
<p>< A single instance of this section is to be shared by all processes using the same backing file.</p>
<p>< Maps of this section, if writable, issue a <code>barrier()</code> when destructed blocking until data (not metadata) reaches physical storage.</p>
<p>< This section is of non-volatile RAM.</p>
<p>< For file backed maps, <code>map_handle::write()</code> is implemented as a <code>write()</code> syscall to the file descriptor. This causes the map to be mapped read-only.</p>
<p>< Use <code>utils::page_sizes()[1]</code> sized pages, or fail.</p>
<p>< Use <code>utils::page_sizes()[2]</code> sized pages, or fail.</p>
<p>< Use <code>utils::page_sizes()[3]</code> sized pages, or fail.</p>
<div class="fragment"><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  {none = 0U, <span class="comment">//!< No flags</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"></span> <a class="code" href="namespacellfio__v2__xxx.html#af678f58d20e1f0962ff0744150342683">read</a> = 1U << 0U, <span class="comment">//!< Memory views can be read</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"></span> <a class="code" href="namespacellfio__v2__xxx.html#a5a8908704c9988bbecc69c2359e6fd4a">write</a> = 1U << 1U, <span class="comment">//!< Memory views can be written</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"></span> cow = 1U << 2U, <span class="comment">//!< Memory views can be copy on written</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"></span> execute = 1U << 3U, <span class="comment">//!< Memory views can execute code</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"></span> </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  nocommit = 1U << 8U, <span class="comment">//!< Don't allocate space for this memory in the system immediately</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"></span> prefault = 1U << 9U, <span class="comment">//!< Prefault, as if by reading every page, any views of memory upon creation.</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"></span> executable = 1U << 10U, <span class="comment">//!< The backing storage is in fact an executable program binary.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"></span> singleton = 1U << 11U, <span class="comment">//!< A single instance of this section is to be shared by all processes using the same backing file.</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"></span> </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  barrier_on_close = 1U << 16U, <span class="comment">//!< Maps of this section, if writable, issue a `barrier()` when destructed blocking until data (not metadata) reaches physical storage.</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"></span> nvram = 1U << 17U, <span class="comment">//!< This section is of non-volatile RAM.</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"></span> write_via_syscall = 1U << 18U, <span class="comment">//!< For file backed maps, `map_handle::write()` is implemented as a `write()` syscall to the file descriptor. This causes the map to be mapped read-only.</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"></span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  page_sizes_1 = 1U << 24U, <span class="comment">//!< Use `utils::page_sizes()[1]` sized pages, or fail.</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"></span> page_sizes_2 = 2U << 24U, <span class="comment">//!< Use `utils::page_sizes()[2]` sized pages, or fail.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"></span> page_sizes_3 = 3U << 24U, <span class="comment">//!< Use `utils::page_sizes()[3]` sized pages, or fail.</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"></span> </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// NOTE: IF UPDATING THIS UPDATE THE std::ostream PRINTER BELOW!!!</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  readwrite = (<a class="code" href="namespacellfio__v2__xxx.html#af678f58d20e1f0962ff0744150342683">read</a> | <a class="code" href="namespacellfio__v2__xxx.html#a5a8908704c9988bbecc69c2359e6fd4a">write</a>)};</div>
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<td class="memname">static result<<a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a>> llfio_v2_xxx::section_handle::section </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> </td>
<td class="paramname"><em>bytes</em>, </td>
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<td class="paramtype">const <a class="el" href="classllfio__v2__xxx_1_1path__handle.html">path_handle</a> & </td>
<td class="paramname"><em>dirh</em> = <code><a class="el" href="namespacellfio__v2__xxx_1_1path__discovery.html#a2dd74ea752f3f511d58ccccdcac7f4fd">path_discovery::storage_backed_temporary_files_directory</a>()</code>, </td>
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<td class="paramname"><em>_flag</em> = <code>flag::read|flag::write</code> </td>
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<p>Create a memory section backed by an anonymous, managed file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">bytes</td><td>The initial size of this section. Cannot be zero. </td></tr>
<tr><td class="paramname">dirh</td><td>Where to create the anonymous, managed file. </td></tr>
<tr><td class="paramname">_flag</td><td>How to create the section.</td></tr>
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</dd>
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<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup(), open() or NtCreateSection() can return.</dt><dd></dd></dl>
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<td class="memname">static result<<a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a>> llfio_v2_xxx::section_handle::section </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> & </td>
<td class="paramname"><em>backing</em>, </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> </td>
<td class="paramname"><em>bytes</em> = <code>0</code> </td>
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<p>Create a memory section backed by a file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">backing</td><td>The handle to use as backing storage. </td></tr>
<tr><td class="paramname">bytes</td><td>The initial size of this section, which cannot be larger than any backing file. Zero means to use <code>backing.maximum_extent()</code>.</td></tr>
</table>
</dd>
</dl>
<p>This convenience overload create a writable section if the backing file is writable, otherwise a read-only section.</p>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup(), open() or NtCreateSection() can return.</dt><dd></dd></dl>
<div class="fragment"><div class="line"><a name="l00157"></a><span class="lineno"> 157</span> { <span class="keywordflow">return</span> <a class="code" href="classllfio__v2__xxx_1_1section__handle.html#a00db3d1bbffbdb4237401568c441da21">section</a>(<a class="code" href="classllfio__v2__xxx_1_1section__handle.html#a680320bd539378d99870d9b2cdedb9c8">backing</a>, bytes, <a class="code" href="classllfio__v2__xxx_1_1section__handle.html#a680320bd539378d99870d9b2cdedb9c8">backing</a>.<a class="code" href="classllfio__v2__xxx_1_1handle.html#a211fee447a47bdeb5424a2a5ae1de852">is_writable</a>() ? (flag::readwrite) : (<a class="code" href="namespacellfio__v2__xxx.html#ab993693c98cdb52e2d611f8f9e24e4e2">flag::read</a>)); }</div>
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<td class="memname">static result<<a class="el" href="classllfio__v2__xxx_1_1section__handle.html">section_handle</a>> llfio_v2_xxx::section_handle::section </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1file__handle.html">file_handle</a> & </td>
<td class="paramname"><em>backing</em>, </td>
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<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> </td>
<td class="paramname"><em>maximum_size</em>, </td>
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<td class="paramtype">flag </td>
<td class="paramname"><em>_flag</em> </td>
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<td>)</td>
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<p>Create a memory section backed by a file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">backing</td><td>The handle to use as backing storage. </td></tr>
<tr><td class="paramname">maximum_size</td><td>The initial size of this section, which cannot be larger than any backing file. Zero means to use <code>backing.maximum_extent()</code>. </td></tr>
<tr><td class="paramname">_flag</td><td>How to create the section.</td></tr>
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</dl>
<dl class="section user"><dt>Errors returnable\n Any of the values POSIX dup(), open() or NtCreateSection() can return.</dt><dd></dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a101620e9fff0c0e8c346af0e9de58b6a">◆ </a></span>set_append_only()</h2>
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<td class="memname">virtual result<void> llfio_v2_xxx::handle::set_append_only </td>
<td>(</td>
<td class="paramtype">bool </td>
<td class="paramname"><em>enable</em></td><td>)</td>
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<p>EXTENSION: Changes whether this handle is append only or not. </p>
<dl class="section warning"><dt>Warning</dt><dd>On Windows this is implemented as a bit of a hack to make it fast like on POSIX, so make sure you open the handle for read/write originally. Note unlike on POSIX the append_only disposition will be the only one toggled, seekable and readable will remain turned on.</dd></dl>
<dl class="section user"><dt>Errors returnable\n Whatever POSIX fcntl() returns. On Windows nothing is changed on the handle.</dt><dd></dd></dl>
<dl class="section user"><dt>Memory Allocations\n No memory allocation.</dt><dd></dd></dl>
<p>Reimplemented in <a class="el" href="classllfio__v2__xxx_1_1process__handle.html#ab64c9fc14fc555b5ec8571863458bf83">llfio_v2_xxx::process_handle</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#aa4d0beac304a5ae9d29441819a829b80">◆ </a></span>truncate()</h2>
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<td class="memname">result<<a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a>> llfio_v2_xxx::section_handle::truncate </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classllfio__v2__xxx_1_1handle.html#a4ee58f1b6a24af5e64d850d1e3eed07f">extent_type</a> </td>
<td class="paramname"><em>newsize</em> = <code>0</code></td><td>)</td>
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<p>Resize the current maximum permitted extent of the memory section to the given extent. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">newsize</td><td>The new size of the memory section, which cannot be zero. Specify zero to use <code>backing.maximum_extent()</code>. This cannot exceed the size of any backing file used if that file is not writable.</td></tr>
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<dl class="section user"><dt>Errors returnable\n Any of the values NtExtendSection() or ftruncate() can return.</dt><dd></dd></dl>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>include/llfio/v2.0/<a class="el" href="map__handle_8hpp.html">map_handle.hpp</a></li>
</ul>
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<div class="ttc" id="aclassllfio__v2__xxx_1_1section__handle_html_a00db3d1bbffbdb4237401568c441da21"><div class="ttname"><a href="classllfio__v2__xxx_1_1section__handle.html#a00db3d1bbffbdb4237401568c441da21">llfio_v2_xxx::section_handle::section</a></div><div class="ttdeci">static result< section_handle > section(file_handle &backing, extent_type maximum_size, flag _flag) noexcept</div><div class="ttdoc">Create a memory section backed by a file.</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1handle_html_a211fee447a47bdeb5424a2a5ae1de852"><div class="ttname"><a href="classllfio__v2__xxx_1_1handle.html#a211fee447a47bdeb5424a2a5ae1de852">llfio_v2_xxx::handle::is_writable</a></div><div class="ttdeci">bool is_writable() const noexcept</div><div class="ttdoc">True if the handle is writable.</div><div class="ttdef"><b>Definition:</b> handle.hpp:342</div></div>
<div class="ttc" id="anamespacellfio__v2__xxx_html_a5a8908704c9988bbecc69c2359e6fd4a"><div class="ttname"><a href="namespacellfio__v2__xxx.html#a5a8908704c9988bbecc69c2359e6fd4a">llfio_v2_xxx::write</a></div><div class="ttdeci">io_handle::io_result< io_handle::const_buffers_type > write(io_handle &self, io_handle::io_request< io_handle::const_buffers_type > reqs, deadline d=deadline()) noexcept</div><div class="ttdoc">Write data to the open handle.</div><div class="ttdef"><b>Definition:</b> io_handle.hpp:596</div></div>
<div class="ttc" id="aclassllfio__v2__xxx_1_1section__handle_html_a680320bd539378d99870d9b2cdedb9c8"><div class="ttname"><a href="classllfio__v2__xxx_1_1section__handle.html#a680320bd539378d99870d9b2cdedb9c8">llfio_v2_xxx::section_handle::backing</a></div><div class="ttdeci">file_handle * backing() const noexcept</div><div class="ttdoc">Returns the borrowed handle backing this section, if any.</div><div class="ttdef"><b>Definition:</b> map_handle.hpp:173</div></div>
<div class="ttc" id="anamespacellfio__v2__xxx_html_af678f58d20e1f0962ff0744150342683"><div class="ttname"><a href="namespacellfio__v2__xxx.html#af678f58d20e1f0962ff0744150342683">llfio_v2_xxx::read</a></div><div class="ttdeci">file_handle::io_result< file_handle::size_type > read(file_handle &self, file_handle::extent_type offset, std::initializer_list< file_handle::buffer_type > lst, deadline d=deadline()) noexcept</div><div class="ttdoc">This is an overloaded member function, provided for convenience. It differs from the above function o...</div><div class="ttdef"><b>Definition:</b> file_handle.hpp:479</div></div>
<div class="ttc" id="anamespacellfio__v2__xxx_html_ab993693c98cdb52e2d611f8f9e24e4e2"><div class="ttname"><a href="namespacellfio__v2__xxx.html#ab993693c98cdb52e2d611f8f9e24e4e2">llfio_v2_xxx::read</a></div><div class="ttdeci">map_handle::io_result< map_handle::buffers_type > read(map_handle &self, map_handle::io_request< map_handle::buffers_type > reqs, deadline d=deadline()) noexcept</div><div class="ttdoc">Read data from the mapped view.</div><div class="ttdef"><b>Definition:</b> map_handle.hpp:1027</div></div>
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