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<div class="navpath"><a class="el" href="a00214.html">ucc</a>::<a class="el" href="a00078.html">MappedMemory</a>
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<h1>ucc::MappedMemory Class Reference</h1><!-- doxytag: class="ucc::MappedMemory" -->
<p>Construct or access a named section of memory.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="a00196_source.html">mapped.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for ucc::MappedMemory:</div>
<div class="dynsection">
<div class="center"><img src="a00435.png" border="0" usemap="#ucc_1_1_mapped_memory_inherit__map" alt="Inheritance graph"/></div>
<map name="ucc_1_1_mapped_memory_inherit__map" id="ucc_1_1_mapped_memory_inherit__map">
<area shape="rect" id="node3" href="a00075.html" title="Template class to map typed vector into shared memory." alt="" coords="5,83,187,112"/><area shape="rect" id="node5" href="a00077.html" title="Class to access a named mapped segment published from another process." alt="" coords="211,83,387,112"/><area shape="rect" id="node7" href="a00079.html" title="Map a reusable allocator over a named shared memory segment." alt="" coords="411,83,552,112"/><area shape="rect" id="node9" href="a00076.html" title="Template class to map typed resusble objects into shared memory heap." alt="" coords="389,160,573,189"/></map>
<center><span class="legend">[<a target="top" href="graph_legend.html">legend</a>]</span></center></div>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">caddr_t </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#a7d017a8edb1ad0909ecc1f521e185006">getStart</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get starting address of mapped segment. <a href="#a7d017a8edb1ad0909ecc1f521e185006"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#a1750c47e0aff47bfd3e68bc550e1409f">len</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get size of mapped segment. <a href="#a1750c47e0aff47bfd3e68bc550e1409f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#a3fbbb797bfdb751878a5b27876483c6d">MappedMemory</a> (const char *name)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Provide read-only mapped access to an existing named shared memory segment. <a href="#a3fbbb797bfdb751878a5b27876483c6d"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#a51fa1984557ea74e963b97aa8cf2e38f">MappedMemory</a> (const char *name, size_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Construct a read/write access mapped shared segment of memory of a known size. <a href="#a51fa1984557ea74e963b97aa8cf2e38f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#a46af8e434926308daf1c3e08f7d5ad60">offset</a> (size_t offset) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get memory from a specific offset within the mapped memory segment. <a href="#a46af8e434926308daf1c3e08f7d5ad60"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#a75f74b77dbe138bef90e253a339328ef">operator bool</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Test if map active. <a href="#a75f74b77dbe138bef90e253a339328ef"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#a27b3986e3831ff3c9c1672f6c3299349">operator!</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Test if map is inactive. <a href="#a27b3986e3831ff3c9c1672f6c3299349"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="adfa52fb2c08ea8f87d4a948159f09730"></a><!-- doxytag: member="ucc::MappedMemory::release" ref="adfa52fb2c08ea8f87d4a948159f09730" args="(void)" -->
void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#adfa52fb2c08ea8f87d4a948159f09730">release</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Unmap memory segment. <br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#aff5d59ddecd57c87ab38ab6a0b6dd62c">sbrk</a> (size_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Extend size of managed heap on shared memory segment. <a href="#aff5d59ddecd57c87ab38ab6a0b6dd62c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ac73aaae80b12708009248df2a0423c0d"></a><!-- doxytag: member="ucc::MappedMemory::~MappedMemory" ref="ac73aaae80b12708009248df2a0423c0d" args="()" -->
virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#ac73aaae80b12708009248df2a0423c0d">~MappedMemory</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Unmap memory segment. <br/></td></tr>
<tr><td colspan="2"><h2>Static Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#aadcccf7f466ff564729d6611a3f15a68">disable</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">An API that allows "disabling" of publishing shared memory maps. <a href="#aadcccf7f466ff564729d6611a3f15a68"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#af32b948b3ca50a8bb439ea9bef4b8930">remove</a> (const char *name)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destroy a previously existing memory segment under the specified name. <a href="#af32b948b3ca50a8bb439ea9bef4b8930"></a><br/></td></tr>
<tr><td colspan="2"><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#a6d853e3912451fd0217547f72fd5a244">create</a> (const char *name, size_t size=(size_t) 0)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Supporting function to construct a new or access an existing shared memory segment. <a href="#a6d853e3912451fd0217547f72fd5a244"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ad95c3b9526fdcf6f8ba4aa8de0d2d7d8"></a><!-- doxytag: member="ucc::MappedMemory::fault" ref="ad95c3b9526fdcf6f8ba4aa8de0d2d7d8" args="(void) const " -->
virtual void </td><td class="memItemRight" valign="bottom"><a class="el" href="a00078.html#ad95c3b9526fdcf6f8ba4aa8de0d2d7d8">fault</a> (void) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Handler to invoke in derived class when accessing outside the shared memory segment boundry. <br/></td></tr>
<tr><td colspan="2"><h2>Protected Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="a3c30daa3727b8d2a1b6fcc0fe5757274"></a><!-- doxytag: member="ucc::MappedMemory::erase" ref="a3c30daa3727b8d2a1b6fcc0fe5757274" args="" -->
bool </td><td class="memItemRight" valign="bottom"><b>erase</b></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af05cdcf98138f9a0ff55e6c44bdb6678"></a><!-- doxytag: member="ucc::MappedMemory::idname" ref="af05cdcf98138f9a0ff55e6c44bdb6678" args="[65]" -->
char </td><td class="memItemRight" valign="bottom"><b>idname</b> [65]</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="adaaceecde71470903008de5f8a4d02d1"></a><!-- doxytag: member="ucc::MappedMemory::size" ref="adaaceecde71470903008de5f8a4d02d1" args="" -->
size_t </td><td class="memItemRight" valign="bottom"><b>size</b></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="af17a282619fb11c797e3789e65ab2fd8"></a><!-- doxytag: member="ucc::MappedMemory::used" ref="af17a282619fb11c797e3789e65ab2fd8" args="" -->
size_t </td><td class="memItemRight" valign="bottom"><b>used</b></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>Construct or access a named section of memory. </p>
<p>A logical name is used which might map to something that is invoked from a call like shm_open or a named w32 mapped swap segment. This is meant to support mapping a vector onto shared memory and is often used as a supporting class for our shared memory access templates. </p>
<dl class="author"><dt><b>Author:</b></dt><dd>David Sugar <<a href="mailto:dyfet@gnutelephony.org">dyfet@gnutelephony.org</a>> </dd></dl>
<p>Definition at line <a class="el" href="a00196_source.html#l00058">58</a> of file <a class="el" href="a00196_source.html">mapped.h</a>.</p>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="a51fa1984557ea74e963b97aa8cf2e38f"></a><!-- doxytag: member="ucc::MappedMemory::MappedMemory" ref="a51fa1984557ea74e963b97aa8cf2e38f" args="(const char *name, size_t size)" -->
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<td class="memname">ucc::MappedMemory::MappedMemory </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>name</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
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<td class="paramtype">size_t </td>
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<p>Construct a read/write access mapped shared segment of memory of a known size. </p>
<p>This constructs a new memory segment. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>of segment. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>size</em> </td><td>of segment. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a3fbbb797bfdb751878a5b27876483c6d"></a><!-- doxytag: member="ucc::MappedMemory::MappedMemory" ref="a3fbbb797bfdb751878a5b27876483c6d" args="(const char *name)" -->
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<td class="memname">ucc::MappedMemory::MappedMemory </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>name</em></td>
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<p>Provide read-only mapped access to an existing named shared memory segment. </p>
<p>The size of the map is found by the size of the already existing segment. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>of existing segment. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a6d853e3912451fd0217547f72fd5a244"></a><!-- doxytag: member="ucc::MappedMemory::create" ref="a6d853e3912451fd0217547f72fd5a244" args="(const char *name, size_t size=(size_t) 0)" -->
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<td class="memname">void ucc::MappedMemory::create </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>name</em>, </td>
</tr>
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<td class="paramkey"></td>
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<td class="paramtype">size_t </td>
<td class="paramname"> <em>size</em> = <code>(size_t) 0</code></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [protected]</code></td>
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<p>Supporting function to construct a new or access an existing shared memory segment. </p>
<p>Used by primary constructors. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>of segment to create or access. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>size</em> </td><td>of segment if creating new. Use 0 for read-only access. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="aadcccf7f466ff564729d6611a3f15a68"></a><!-- doxytag: member="ucc::MappedMemory::disable" ref="aadcccf7f466ff564729d6611a3f15a68" args="(void)" -->
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<td class="memname">static void ucc::MappedMemory::disable </td>
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<td> ) </td>
<td><code> [static]</code></td>
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<p>An API that allows "disabling" of publishing shared memory maps. </p>
<p>This may be useful when an app doesn't want to use shared memory as a runtime or build option, but does not want to have to be "recoded" exclicity for non-shared memory either. Basically it substitutes a dummy map running on the local heap. </p>
</div>
</div>
<a class="anchor" id="a7d017a8edb1ad0909ecc1f521e185006"></a><!-- doxytag: member="ucc::MappedMemory::getStart" ref="a7d017a8edb1ad0909ecc1f521e185006" args="(void)" -->
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<td class="memname">caddr_t ucc::MappedMemory::getStart </td>
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<td class="paramtype">void </td>
<td class="paramname"></td>
<td> ) </td>
<td><code> [inline]</code></td>
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<p>Get starting address of mapped segment. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>starting address of mapped segment. </dd></dl>
<p>Definition at line <a class="el" href="a00196_source.html#l00162">162</a> of file <a class="el" href="a00196_source.html">mapped.h</a>.</p>
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<a class="anchor" id="a1750c47e0aff47bfd3e68bc550e1409f"></a><!-- doxytag: member="ucc::MappedMemory::len" ref="a1750c47e0aff47bfd3e68bc550e1409f" args="(void)" -->
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<td class="memname">size_t ucc::MappedMemory::len </td>
<td>(</td>
<td class="paramtype">void </td>
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<td> ) </td>
<td><code> [inline]</code></td>
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<p>Get size of mapped segment. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>size of mapped segment. </dd></dl>
<p>Definition at line <a class="el" href="a00196_source.html#l00155">155</a> of file <a class="el" href="a00196_source.html">mapped.h</a>.</p>
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<a class="anchor" id="a46af8e434926308daf1c3e08f7d5ad60"></a><!-- doxytag: member="ucc::MappedMemory::offset" ref="a46af8e434926308daf1c3e08f7d5ad60" args="(size_t offset) const " -->
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<td class="memname">void* ucc::MappedMemory::offset </td>
<td>(</td>
<td class="paramtype">size_t </td>
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<p>Get memory from a specific offset within the mapped memory segment. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>offset</em> </td><td>from start of segment. Will fault if past end. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>address of offset. </dd></dl>
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<a class="anchor" id="a75f74b77dbe138bef90e253a339328ef"></a><!-- doxytag: member="ucc::MappedMemory::operator bool" ref="a75f74b77dbe138bef90e253a339328ef" args="() const " -->
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<p>Test if map active. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>true if active map. </dd></dl>
<p>Reimplemented in <a class="el" href="a00076.html#a0f97fd1654b110132c5d7b88fd3d1475">ucc::mapped_reuse< T ></a>.</p>
<p>Definition at line <a class="el" href="a00196_source.html#l00125">125</a> of file <a class="el" href="a00196_source.html">mapped.h</a>.</p>
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<p>Test if map is inactive. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>true if map inactive. </dd></dl>
<p>Reimplemented in <a class="el" href="a00076.html#a718e2aaca553791a031fbe9acb72050f">ucc::mapped_reuse< T ></a>.</p>
<p>Definition at line <a class="el" href="a00196_source.html#l00132">132</a> of file <a class="el" href="a00196_source.html">mapped.h</a>.</p>
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<a class="anchor" id="af32b948b3ca50a8bb439ea9bef4b8930"></a><!-- doxytag: member="ucc::MappedMemory::remove" ref="af32b948b3ca50a8bb439ea9bef4b8930" args="(const char *name)" -->
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<td class="memname">static void ucc::MappedMemory::remove </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>name</em></td>
<td> ) </td>
<td><code> [static]</code></td>
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<p>Destroy a previously existing memory segment under the specified name. </p>
<p>This is used both before creating a new one, and after a publishing process unmaps the segment it created. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>name</em> </td><td>of segment to remove. </td></tr>
</table>
</dd>
</dl>
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</div>
<a class="anchor" id="aff5d59ddecd57c87ab38ab6a0b6dd62c"></a><!-- doxytag: member="ucc::MappedMemory::sbrk" ref="aff5d59ddecd57c87ab38ab6a0b6dd62c" args="(size_t size)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void* ucc::MappedMemory::sbrk </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>size</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
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<div class="memdoc">
<p>Extend size of managed heap on shared memory segment. </p>
<p>This does not change the size of the mapped segment in any way, only that of any heap space that is being allocated and used from the mapped segment. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>start of space from map. </dd></dl>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>size</em> </td><td>of space requested. Will fault if past end of segment. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li>ucommon/<a class="el" href="a00196_source.html">mapped.h</a></li>
</ul>
</div>
<hr class="footer"/><address style="text-align: right;"><small>Generated on Tue Jul 6 08:22:34 2010 for UCommon by
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.3 </small></address>
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