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<div class="header">
  <div class="summary">
<a href="structmdesc-members.html">List of all members</a> &#124;
<a href="#pub-attribs">Public Attributes</a>  </div>
  <div class="headertitle">
<div class="title">mdesc Struct Reference</div>  </div>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Descriptor of a mmalloc area. </p>
<p>Internal structure that defines the format of the malloc-descriptor. This gets written to the base address of the region that mmalloc is managing, and thus also becomes the file header for the mapped file, if such a file exists. </p>
</div>
<p><code>#include &lt;mmprivate.h&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
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<tr class="memdesc:a13dc53e0d6cd59a96fba2b9c1d4469ab"><td class="mdescLeft">&#160;</td><td class="mdescRight">Mutex locking the access to the heap.  <a href="#a13dc53e0d6cd59a96fba2b9c1d4469ab">More...</a><br /></td></tr>
<tr class="separator:a13dc53e0d6cd59a96fba2b9c1d4469ab"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:afef5e94673c88de258db0df9563564d8"><td class="memItemLeft" align="right" valign="top">unsigned int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmdesc.html#afef5e94673c88de258db0df9563564d8">refcount</a></td></tr>
<tr class="memdesc:afef5e94673c88de258db0df9563564d8"><td class="mdescLeft">&#160;</td><td class="mdescRight">Number of processes that attached the heap.  <a href="#afef5e94673c88de258db0df9563564d8">More...</a><br /></td></tr>
<tr class="separator:afef5e94673c88de258db0df9563564d8"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:adf935a33953e319f161205bb6ab627e9"><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="structmdesc.html">mdesc</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmdesc.html#adf935a33953e319f161205bb6ab627e9">next_mdesc</a></td></tr>
<tr class="memdesc:adf935a33953e319f161205bb6ab627e9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Chained lists of mdescs.  <a href="#adf935a33953e319f161205bb6ab627e9">More...</a><br /></td></tr>
<tr class="separator:adf935a33953e319f161205bb6ab627e9"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="separator:a0966989a3653fd1830593fdce72a487c"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="separator:af339c55746da3c27435a5778fb0a79ba"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="separator:a2c21e9954b2450bc0dcdf9de57c4b6cb"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="separator:a215680eddd361471aff151cae4d70fcc"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="separator:afff6d1a4bc377e01a6c76f03097f396e"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="separator:acbbafaf54ce1b0c4bf7e1a5b8bcd7697"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="memdesc:a60821fb201d9c9dc94473e218d33d92b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Limit of valid info table indices.  <a href="#a60821fb201d9c9dc94473e218d33d92b">More...</a><br /></td></tr>
<tr class="separator:a60821fb201d9c9dc94473e218d33d92b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ad36ab422078986edd518be58c4ccd5cc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structmalloc__info.html">malloc_info</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmdesc.html#ad36ab422078986edd518be58c4ccd5cc">heapinfo</a></td></tr>
<tr class="memdesc:ad36ab422078986edd518be58c4ccd5cc"><td class="mdescLeft">&#160;</td><td class="mdescRight">Block information table.  <a href="#ad36ab422078986edd518be58c4ccd5cc">More...</a><br /></td></tr>
<tr class="separator:ad36ab422078986edd518be58c4ccd5cc"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ae91ccba010694a420bcfb85a84d047f2"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__XBT__swag__type.html#ga475e697f7fb2a1d075bc73c23d22bb3f">s_xbt_swag_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmdesc.html#ae91ccba010694a420bcfb85a84d047f2">fraghead</a> [<a class="el" href="mmprivate_8h.html#a101c64c596fd16bf6212ee958a9fa9db">BLOCKLOG</a>]</td></tr>
<tr class="separator:ae91ccba010694a420bcfb85a84d047f2"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="separator:a111c4e49603e263348fdfc9c6e2acec5"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2e21a566a5e11afbf7378bef43468091"><td class="memItemLeft" align="right" valign="top"><a class="el" href="smpi__mpi_8cpp.html#ac9c84fa68bbad002983e35ce3663c686">void</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmdesc.html#a2e21a566a5e11afbf7378bef43468091">breakval</a></td></tr>
<tr class="memdesc:a2e21a566a5e11afbf7378bef43468091"><td class="mdescLeft">&#160;</td><td class="mdescRight">End of memory in use.  <a href="#a2e21a566a5e11afbf7378bef43468091">More...</a><br /></td></tr>
<tr class="separator:a2e21a566a5e11afbf7378bef43468091"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac1c5bbaabf043d854ad09aab3ec6fd5b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="smpi__mpi_8cpp.html#ac9c84fa68bbad002983e35ce3663c686">void</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmdesc.html#ac1c5bbaabf043d854ad09aab3ec6fd5b">top</a></td></tr>
<tr class="memdesc:ac1c5bbaabf043d854ad09aab3ec6fd5b"><td class="mdescLeft">&#160;</td><td class="mdescRight">End of the current memory region for this malloc heap.  <a href="#ac1c5bbaabf043d854ad09aab3ec6fd5b">More...</a><br /></td></tr>
<tr class="separator:ac1c5bbaabf043d854ad09aab3ec6fd5b"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2bb01d5ecb4430578f0aad408e24f969"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmdesc.html#a2bb01d5ecb4430578f0aad408e24f969">fd</a></td></tr>
<tr class="memdesc:a2bb01d5ecb4430578f0aad408e24f969"><td class="mdescLeft">&#160;</td><td class="mdescRight">Open file descriptor for the file to which this malloc heap is mapped.  <a href="#a2bb01d5ecb4430578f0aad408e24f969">More...</a><br /></td></tr>
<tr class="separator:a2bb01d5ecb4430578f0aad408e24f969"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8512e0a335101a792b9f1f1d61d14648"><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="structmstats.html">mstats</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structmdesc.html#a8512e0a335101a792b9f1f1d61d14648">heapstats</a></td></tr>
<tr class="separator:a8512e0a335101a792b9f1f1d61d14648"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<h2 class="groupheader">Member Data Documentation</h2>
<a id="a13dc53e0d6cd59a96fba2b9c1d4469ab"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a13dc53e0d6cd59a96fba2b9c1d4469ab">&#9670;&nbsp;</a></span>mutex</h2>

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          <td class="memname">pthread_mutex_t mdesc::mutex</td>
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<p>Mutex locking the access to the heap. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#afef5e94673c88de258db0df9563564d8">&#9670;&nbsp;</a></span>refcount</h2>

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<p>Number of processes that attached the heap. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#adf935a33953e319f161205bb6ab627e9">&#9670;&nbsp;</a></span>next_mdesc</h2>

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<p>Chained lists of mdescs. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a0966989a3653fd1830593fdce72a487c">&#9670;&nbsp;</a></span>magic</h2>

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          <td class="memname">char mdesc::magic[<a class="el" href="mmprivate_8h.html#a0eb4beb2784539ebb67bbf8e36c351c0">MMALLOC_MAGIC_SIZE</a>]</td>
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<p>The "magic number" for an mmalloc file. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#af339c55746da3c27435a5778fb0a79ba">&#9670;&nbsp;</a></span>headersize</h2>

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<p>The size in bytes of this structure. </p>
<p>Used as a sanity check when reusing a previously created mapped file. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ab0dce026d630e807b48e616ad778f776">&#9670;&nbsp;</a></span>version</h2>

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<p>Version number of the mmalloc package that created this file. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a309aa952afa857de9cc9bc2024a49784">&#9670;&nbsp;</a></span>options</h2>

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<h2 class="memtitle"><span class="permalink"><a href="#a2c21e9954b2450bc0dcdf9de57c4b6cb">&#9670;&nbsp;</a></span>flags</h2>

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<p>Some flag bits to keep track of various internal things. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a215680eddd361471aff151cae4d70fcc">&#9670;&nbsp;</a></span>heapsize</h2>

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<p>Number of info entries. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#afff6d1a4bc377e01a6c76f03097f396e">&#9670;&nbsp;</a></span>heapbase</h2>

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          <td class="memname"><a class="el" href="smpi__mpi_8cpp.html#ac9c84fa68bbad002983e35ce3663c686">void</a>* mdesc::heapbase</td>
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<p>Pointer to first block of the heap (base of the first block). </p>

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<h2 class="memtitle"><span class="permalink"><a href="#acbbafaf54ce1b0c4bf7e1a5b8bcd7697">&#9670;&nbsp;</a></span>heapindex</h2>

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<p>Current search index for the heap table. </p>
<p>Search index in the info table. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a60821fb201d9c9dc94473e218d33d92b">&#9670;&nbsp;</a></span>heaplimit</h2>

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<p>Limit of valid info table indices. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ad36ab422078986edd518be58c4ccd5cc">&#9670;&nbsp;</a></span>heapinfo</h2>

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          <td class="memname"><a class="el" href="structmalloc__info.html">malloc_info</a>* mdesc::heapinfo</td>
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<p>Block information table. </p>
<p>Table indexed by block number giving per-block information. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#ae91ccba010694a420bcfb85a84d047f2">&#9670;&nbsp;</a></span>fraghead</h2>

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          <td class="memname"><a class="el" href="group__XBT__swag__type.html#ga475e697f7fb2a1d075bc73c23d22bb3f">s_xbt_swag_t</a> mdesc::fraghead[<a class="el" href="mmprivate_8h.html#a101c64c596fd16bf6212ee958a9fa9db">BLOCKLOG</a>]</td>
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<h2 class="memtitle"><span class="permalink"><a href="#a111c4e49603e263348fdfc9c6e2acec5">&#9670;&nbsp;</a></span>base</h2>

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          <td class="memname"><a class="el" href="smpi__mpi_8cpp.html#ac9c84fa68bbad002983e35ce3663c686">void</a>* mdesc::base</td>
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<h2 class="memtitle"><span class="permalink"><a href="#a2e21a566a5e11afbf7378bef43468091">&#9670;&nbsp;</a></span>breakval</h2>

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          <td class="memname"><a class="el" href="smpi__mpi_8cpp.html#ac9c84fa68bbad002983e35ce3663c686">void</a>* mdesc::breakval</td>
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<p>End of memory in use. </p>
<p>Some memory might be already mapped by the OS but not used by the heap. </p>

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<a id="ac1c5bbaabf043d854ad09aab3ec6fd5b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac1c5bbaabf043d854ad09aab3ec6fd5b">&#9670;&nbsp;</a></span>top</h2>

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          <td class="memname"><a class="el" href="smpi__mpi_8cpp.html#ac9c84fa68bbad002983e35ce3663c686">void</a>* mdesc::top</td>
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<p>End of the current memory region for this malloc heap. </p>
<p>This is the first location past the end of mapped memory.</p>
<p>Compared to breakval, this value is rounded to the next memory page. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a2bb01d5ecb4430578f0aad408e24f969">&#9670;&nbsp;</a></span>fd</h2>

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<p>Open file descriptor for the file to which this malloc heap is mapped. </p>
<p>If this value is negative, MAP_ANONYMOUS memory is used.</p>
<p>Also note that it may change each time the region is mapped and unmapped. </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a8512e0a335101a792b9f1f1d61d14648">&#9670;&nbsp;</a></span>heapstats</h2>

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<hr/>The documentation for this struct was generated from the following file:<ul>
<li>src/xbt/mmalloc/<a class="el" href="mmprivate_8h.html">mmprivate.h</a></li>
</ul>
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