doc/html/boost/interprocess/xsi_shared_memory.html

   1 <html>
   2 <head>
   3 <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
   4 <title>Class xsi_shared_memory</title>
   5 <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css">
   6 <meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
   7 <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
   8 <link rel="up" href="../../interprocess/indexes_reference.html#header.boost.interprocess.xsi_shared_memory_hpp" title="Header &lt;boost/interprocess/xsi_shared_memory.hpp&gt;">
   9 <link rel="prev" href="xsi_key.html" title="Class xsi_key">
  10 <link rel="next" href="../../intrusive.html" title="Chapter&#160;15.&#160;Boost.Intrusive">
  11 </head>
  12 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
  13 <table cellpadding="2" width="100%"><tr>
  14 <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td>
  15 <td align="center"><a href="../../../../index.html">Home</a></td>
  16 <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td>
  17 <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
  18 <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
  19 <td align="center"><a href="../../../../more/index.htm">More</a></td>
  20 </tr></table>
  21 <hr>
  22 <div class="spirit-nav">
  23 <a accesskey="p" href="xsi_key.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../interprocess/indexes_reference.html#header.boost.interprocess.xsi_shared_memory_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../../intrusive.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
  24 </div>
  25 <div class="refentry">
  26 <a name="boost.interprocess.xsi_shared_memory"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Class xsi_shared_memory</span></h2>
  29 <p>boost::interprocess::xsi_shared_memory</p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../interprocess/indexes_reference.html#header.boost.interprocess.xsi_shared_memory_hpp" title="Header &lt;boost/interprocess/xsi_shared_memory.hpp&gt;">boost/interprocess/xsi_shared_memory.hpp</a>&gt;
  33
  34 </span>
  35 <span class="keyword">class</span> <a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">{</span>
  36 <span class="keyword">public</span><span class="special">:</span>
  37   <span class="comment">// <a class="link" href="xsi_shared_memory.html#boost.interprocess.xsi_shared_memoryconstruct-copy-destruct">construct/copy/destruct</a></span>
  38   <a class="link" href="xsi_shared_memory.html#idp67408752-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  39   <a class="link" href="xsi_shared_memory.html#idp67410224-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
  40   <a class="link" href="xsi_shared_memory.html#idp67412576-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="create_only_t.html" title="Struct create_only_t">create_only_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span>
  41                     <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
  42   <a class="link" href="xsi_shared_memory.html#idp67418048-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="open_or_create_t.html" title="Struct open_or_create_t">open_or_create_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span>
  43                     <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span>
  44   <a class="link" href="xsi_shared_memory.html#idp67423536-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  45   <a class="link" href="xsi_shared_memory.html#idp67426304-bb"><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  46   <a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;</span> <a class="link" href="xsi_shared_memory.html#idp67428112-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;&amp;</span><span class="special">)</span><span class="special">;</span>
  47   <a class="link" href="xsi_shared_memory.html#idp67430480-bb"><span class="special">~</span><span class="identifier">xsi_shared_memory</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  48
  49   <span class="comment">// <a class="link" href="xsi_shared_memory.html#idp67402736-bb">public member functions</a></span>
  50   <span class="keyword">void</span> <a class="link" href="xsi_shared_memory.html#idp67403296-bb"><span class="identifier">swap</span></a><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  51   <span class="keyword">int</span> <a class="link" href="xsi_shared_memory.html#idp67405440-bb"><span class="identifier">get_shmid</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  52   <span class="identifier">mapping_handle_t</span> <a class="link" href="xsi_shared_memory.html#idp67407024-bb"><span class="identifier">get_mapping_handle</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  53
  54   <span class="comment">// <a class="link" href="xsi_shared_memory.html#idp67431296-bb">public static functions</a></span>
  55   <span class="keyword">static</span> <span class="keyword">bool</span> <a class="link" href="xsi_shared_memory.html#idp67431856-bb"><span class="identifier">remove</span></a><span class="special">(</span><span class="keyword">int</span><span class="special">)</span><span class="special">;</span>
  56 <span class="special">}</span><span class="special">;</span></pre></div>
  57 <div class="refsect1">
  58 <a name="idp252652896"></a><h2>Description</h2>
  59 <p>A class that wraps XSI (System V) shared memory. Unlike <a class="link" href="shared_memory_object.html" title="Class shared_memory_object">shared_memory_object</a>, <a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> needs a valid <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> to identify a shared memory object.</p>
  60 <p>Warning: XSI shared memory and interprocess portable shared memory (<a class="link" href="shared_memory_object.html" title="Class shared_memory_object">boost::interprocess::shared_memory_object</a>) can't communicate between them. </p>
  61 <div class="refsect2">
  62 <a name="idp252657472"></a><h3>
  63 <a name="boost.interprocess.xsi_shared_memoryconstruct-copy-destruct"></a><code class="computeroutput">xsi_shared_memory</code>
  64         public
  65        construct/copy/destruct</h3>
  66 <div class="orderedlist"><ol class="orderedlist" type="1">
  67 <li class="listitem">
  68 <pre class="literallayout"><a name="idp67408752-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  69 <p>Default constructor. Represents an empty <code class="computeroutput"><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a></code>. </p>
  70 </li>
  71 <li class="listitem">
  72 <pre class="literallayout"><a name="idp67410224-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">int</span> shmid<span class="special">)</span><span class="special">;</span></pre>
  73 <p>Initializes *this with a shmid previously obtained (possibly from another process) This lower-level initializer allows shared memory mapping without having a key. </p>
  74 </li>
  75 <li class="listitem">
  76 <pre class="literallayout"><a name="idp67412576-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="create_only_t.html" title="Struct create_only_t">create_only_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span> key<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> size<span class="special">,</span>
  77                   <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> perm <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre>
  78 <p>Creates a new XSI shared memory from 'key', with size "size" and permissions "perm". If the shared memory previously exists, throws an error. </p>
  79 </li>
  80 <li class="listitem">
  81 <pre class="literallayout"><a name="idp67418048-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="open_or_create_t.html" title="Struct open_or_create_t">open_or_create_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span> key<span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> size<span class="special">,</span>
  82                   <span class="keyword">const</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a> <span class="special">&amp;</span> perm <span class="special">=</span> <a class="link" href="permissions.html" title="Class permissions">permissions</a><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre>
  83 <p>Opens an existing shared memory with identifier 'key' or creates a new XSI shared memory from identifier 'key', with size "size" and permissions "perm". </p>
  84 </li>
  85 <li class="listitem">
  86 <pre class="literallayout"><a name="idp67423536-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="open_only_t.html" title="Struct open_only_t">open_only_t</a><span class="special">,</span> <span class="keyword">const</span> <a class="link" href="xsi_key.html" title="Class xsi_key">xsi_key</a> <span class="special">&amp;</span> key<span class="special">)</span><span class="special">;</span></pre>
  87 <p>Tries to open a XSI shared memory with identifier 'key' If the shared memory does not previously exist, it throws an error. </p>
  88 </li>
  89 <li class="listitem">
  90 <pre class="literallayout"><a name="idp67426304-bb"></a><span class="identifier">xsi_shared_memory</span><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;&amp;</span> moved<span class="special">)</span><span class="special">;</span></pre>
  91 <p>Moves the ownership of "moved"'s shared memory object to *this. After the call, "moved" does not represent any shared memory object. Does not throw </p>
  92 </li>
  93 <li class="listitem">
  94 <pre class="literallayout"><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;</span> <a name="idp67428112-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;&amp;</span> moved<span class="special">)</span><span class="special">;</span></pre>
  95 <p>Moves the ownership of "moved"'s shared memory to *this. After the call, "moved" does not represent any shared memory. Does not throw </p>
  96 </li>
  97 <li class="listitem">
  98 <pre class="literallayout"><a name="idp67430480-bb"></a><span class="special">~</span><span class="identifier">xsi_shared_memory</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
  99 <p>Destroys *this. The shared memory won't be destroyed, just this connection to it. Use remove() to destroy the shared memory. </p>
 100 </li>
 101 </ol></div>
 102 </div>
 103 <div class="refsect2">
 104 <a name="idp252727136"></a><h3>
 105 <a name="idp67402736-bb"></a><code class="computeroutput">xsi_shared_memory</code> public member functions</h3>
 106 <div class="orderedlist"><ol class="orderedlist" type="1">
 107 <li class="listitem">
 108 <pre class="literallayout"><span class="keyword">void</span> <a name="idp67403296-bb"></a><span class="identifier">swap</span><span class="special">(</span><a class="link" href="xsi_shared_memory.html" title="Class xsi_shared_memory">xsi_shared_memory</a> <span class="special">&amp;</span> other<span class="special">)</span><span class="special">;</span></pre>Swaps two xsi_shared_memorys. Does not throw. </li>
 109 <li class="listitem">
 110 <pre class="literallayout"><span class="keyword">int</span> <a name="idp67405440-bb"></a><span class="identifier">get_shmid</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 111 <p>Returns the shared memory ID that identifies the shared memory </p>
 112 </li>
 113 <li class="listitem">
 114 <pre class="literallayout"><span class="identifier">mapping_handle_t</span> <a name="idp67407024-bb"></a><span class="identifier">get_mapping_handle</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 115 <p>Returns the mapping handle. Never throws </p>
 116 </li>
 117 </ol></div>
 118 </div>
 119 <div class="refsect2">
 120 <a name="idp252745792"></a><h3>
 121 <a name="idp67431296-bb"></a><code class="computeroutput">xsi_shared_memory</code> public static functions</h3>
 122 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
 123 <pre class="literallayout"><span class="keyword">static</span> <span class="keyword">bool</span> <a name="idp67431856-bb"></a><span class="identifier">remove</span><span class="special">(</span><span class="keyword">int</span> shmid<span class="special">)</span><span class="special">;</span></pre>
 124 <p>Erases the XSI shared memory object identified by shmid from the system. Returns false on error. Never throws </p>
 125 </li></ol></div>
 126 </div>
 127 </div>
 128 </div>
 129 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 130 <td align="left"></td>
 131 <td align="right"><div class="copyright-footer">Copyright &#169; 2005-2012 Ion Gaztanaga<p>
 132         Distributed under the Boost Software License, Version 1.0. (See accompanying
 133         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
 134       </p>
 135 </div></td>
 136 </tr></table>
 137 <hr>
 138 <div class="spirit-nav">
 139 <a accesskey="p" href="xsi_key.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../interprocess/indexes_reference.html#header.boost.interprocess.xsi_shared_memory_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../../intrusive.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
 140 </div>
 141 </body>
 142 </html>