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<h1>ost::MemPager Class Reference</h1><!-- doxytag: class="ost::MemPager" -->
<p>The memory pager is used to allocate cumulative memory pages for storing object specific "persistant" data that is presumed to persist during the life of a given derived object.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="misc_8h_source.html">misc.h</a>></code></p>
<div class="dynheader">
Inheritance diagram for ost::MemPager:</div>
<div class="dynsection">
<div class="center">
<img src="classost_1_1_mem_pager.png" usemap="#ost::MemPager_map" alt=""/>
<map id="ost::MemPager_map" name="ost::MemPager_map">
<area href="classost_1_1_keydata.html" alt="ost::Keydata" shape="rect" coords="0,56,136,80"/>
<area href="classost_1_1_shared_mem_pager.html" alt="ost::SharedMemPager" shape="rect" coords="146,56,282,80"/>
<area href="classost_1_1_stack_pager.html" alt="ost::StackPager" shape="rect" coords="292,56,428,80"/>
</map>
</div>
</div>
<p><a href="classost_1_1_mem_pager-members.html">List of all members.</a></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Classes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">struct </td><td class="memItemRight" valign="bottom"><b>_page</b></td></tr>
<tr><td colspan="2"><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a320897ecfca3e92378c45ec70aee58ba">getPages</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the total number of pages that have been allocated for this memory pool. <a href="#a320897ecfca3e92378c45ec70aee58ba"></a><br/></td></tr>
<tr><td colspan="2"><h2>Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void * </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a2c82ac4c97fcba81c643966973e78d84">first</a> (size_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate first workspace from paged memory. <a href="#a2c82ac4c97fcba81c643966973e78d84"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual void * </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a3a03cb50bd4084ddbf6314ec0339d176">alloc</a> (size_t size)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate memory from either the currently active page, or allocate a new page for the object. <a href="#a3a03cb50bd4084ddbf6314ec0339d176"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a7ea4e6f82bffa66c994fcd10ebdee594">first</a> (char *str)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate a string from the memory pager pool and copy the string into it's new memory area. <a href="#a7ea4e6f82bffa66c994fcd10ebdee594"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">char * </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a245b6c4181ccccbabc52f1c3451f2fb6">alloc</a> (const char *str)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate a string from the memory pager pool and copy the string inti it's new memory area. <a href="#a245b6c4181ccccbabc52f1c3451f2fb6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a5dc37c26af34d6f4c26e125eded3e2be">MemPager</a> (size_t pagesize=4096)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create a paged memory pool for cumulative storage. <a href="#a5dc37c26af34d6f4c26e125eded3e2be"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a5bfdb6f2d6f569ba08c32c59efb3a012">purge</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">purge the current memory pool. <a href="#a5bfdb6f2d6f569ba08c32c59efb3a012"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a8efb94a243063ed1f9d1ddb315cb6042">clean</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Clean for memory cleanup before exiting. <a href="#a8efb94a243063ed1f9d1ddb315cb6042"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a58dcf48146eca4ae2286706968fdf9c5">~MemPager</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Delete the memory pool and all allocated memory. <a href="#a58dcf48146eca4ae2286706968fdf9c5"></a><br/></td></tr>
<tr><td colspan="2"><h2>Friends</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#a7fb804f7dc96dd9f705c84095f37f1ca">String</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">class </td><td class="memItemRight" valign="bottom"><a class="el" href="classost_1_1_mem_pager.html#ac5ec8bc6fca4e4e6a8faa45d4b0a9d58">MemPagerObject</a></td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>The memory pager is used to allocate cumulative memory pages for storing object specific "persistant" data that is presumed to persist during the life of a given derived object. </p>
<p>When the object is destroyed, all accumulated data is automatically purged.</p>
<p>There are a number of odd and specialized utility classes found in Common C++. The most common of these is the "MemPager" class. This is basically a class to enable page-grouped "cumulative" memory allocation; all accumulated allocations are dropped during the destructor. This class has found it's way in a lot of other utility classes in Common C++.</p>
<dl class="author"><dt><b>Author:</b></dt><dd>David Sugar <<a href="mailto:dyfet@ostel.com">dyfet@ostel.com</a>> Accumulative object memory allocator. </dd></dl>
<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="a5dc37c26af34d6f4c26e125eded3e2be"></a><!-- doxytag: member="ost::MemPager::MemPager" ref="a5dc37c26af34d6f4c26e125eded3e2be" args="(size_t pagesize=4096)" -->
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<td class="memname">ost::MemPager::MemPager </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>pagesize</em> = <code>4096</code></td>
<td> ) </td>
<td><code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Create a paged memory pool for cumulative storage. </p>
<p>This pool allocates memory in fixed "pagesize" chunks. Ideal performance is achived when the pool size matches the system page size. This pool can only exist in derived objects.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>pagesize</em> </td><td>page size to allocate chunks. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="a58dcf48146eca4ae2286706968fdf9c5"></a><!-- doxytag: member="ost::MemPager::~MemPager" ref="a58dcf48146eca4ae2286706968fdf9c5" args="()" -->
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<td class="memname">virtual ost::MemPager::~MemPager </td>
<td>(</td>
<td class="paramname"></td>
<td> ) </td>
<td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Delete the memory pool and all allocated memory. </p>
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a245b6c4181ccccbabc52f1c3451f2fb6"></a><!-- doxytag: member="ost::MemPager::alloc" ref="a245b6c4181ccccbabc52f1c3451f2fb6" args="(const char *str)" -->
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<td class="memname">char* ost::MemPager::alloc </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>str</em></td>
<td> ) </td>
<td><code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Allocate a string from the memory pager pool and copy the string inti it's new memory area. </p>
<p>This checks only the last active page for available space before allocating a new page.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>str</em> </td><td>string to allocate and copy into paged memory pool. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>copy of string from allocated memory. </dd></dl>
</div>
</div>
<a class="anchor" id="a3a03cb50bd4084ddbf6314ec0339d176"></a><!-- doxytag: member="ost::MemPager::alloc" ref="a3a03cb50bd4084ddbf6314ec0339d176" args="(size_t size)" -->
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<td class="memname">virtual void* ost::MemPager::alloc </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>size</em></td>
<td> ) </td>
<td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Allocate memory from either the currently active page, or allocate a new page for the object. </p>
<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>size of memory to allocate. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>pointer to allocated memory. </dd></dl>
<p>Reimplemented in <a class="el" href="classost_1_1_shared_mem_pager.html#ad5c3aad294fd247a972a72983dcf831b">ost::SharedMemPager</a>.</p>
<p>Referenced by <a class="el" href="misc_8h_source.html#l00642">ost::MemPagerObject::operator new()</a>, and <a class="el" href="misc_8h_source.html#l00651">ost::MemPagerObject::operator new[]()</a>.</p>
</div>
</div>
<a class="anchor" id="a8efb94a243063ed1f9d1ddb315cb6042"></a><!-- doxytag: member="ost::MemPager::clean" ref="a8efb94a243063ed1f9d1ddb315cb6042" args="(void)" -->
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<td class="memname">void ost::MemPager::clean </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td>
<td> ) </td>
<td><code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Clean for memory cleanup before exiting. </p>
</div>
</div>
<a class="anchor" id="a7ea4e6f82bffa66c994fcd10ebdee594"></a><!-- doxytag: member="ost::MemPager::first" ref="a7ea4e6f82bffa66c994fcd10ebdee594" args="(char *str)" -->
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<td class="memname">char* ost::MemPager::first </td>
<td>(</td>
<td class="paramtype">char * </td>
<td class="paramname"> <em>str</em></td>
<td> ) </td>
<td><code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Allocate a string from the memory pager pool and copy the string into it's new memory area. </p>
<p>This method allocates memory by first searching for an available page, and then allocating a new page if no space is found.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>str</em> </td><td>string to allocate and copy into paged memory pool. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>copy of string from allocated memory. </dd></dl>
</div>
</div>
<a class="anchor" id="a2c82ac4c97fcba81c643966973e78d84"></a><!-- doxytag: member="ost::MemPager::first" ref="a2c82ac4c97fcba81c643966973e78d84" args="(size_t size)" -->
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<td class="memname">virtual void* ost::MemPager::first </td>
<td>(</td>
<td class="paramtype">size_t </td>
<td class="paramname"> <em>size</em></td>
<td> ) </td>
<td><code> [protected, virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Allocate first workspace from paged memory. </p>
<p>This method scans all currently allocated blocks for available space before adding new pages and hence is both slower and more efficient.</p>
<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>size of memory to allocate. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>pointer to allocated memory. </dd></dl>
<p>Reimplemented in <a class="el" href="classost_1_1_shared_mem_pager.html#a644a00d48052aff83a180523b205aa6f">ost::SharedMemPager</a>.</p>
</div>
</div>
<a class="anchor" id="a320897ecfca3e92378c45ec70aee58ba"></a><!-- doxytag: member="ost::MemPager::getPages" ref="a320897ecfca3e92378c45ec70aee58ba" args="(void)" -->
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<td class="memname">int ost::MemPager::getPages </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td>
<td> ) </td>
<td><code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Return the total number of pages that have been allocated for this memory pool. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>number of pages allocated. </dd></dl>
</div>
</div>
<a class="anchor" id="a5bfdb6f2d6f569ba08c32c59efb3a012"></a><!-- doxytag: member="ost::MemPager::purge" ref="a5bfdb6f2d6f569ba08c32c59efb3a012" args="(void)" -->
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<td class="memname">void ost::MemPager::purge </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td>
<td> ) </td>
<td><code> [protected]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>purge the current memory pool. </p>
<p>Reimplemented in <a class="el" href="classost_1_1_stack_pager.html#ac903c181770651ee8f42717892dd9fa4">ost::StackPager</a>, and <a class="el" href="classost_1_1_shared_mem_pager.html#afafb0b8ce31a2b1fdee64a5a9cadebc6">ost::SharedMemPager</a>.</p>
</div>
</div>
<hr/><h2>Friends And Related Function Documentation</h2>
<a class="anchor" id="ac5ec8bc6fca4e4e6a8faa45d4b0a9d58"></a><!-- doxytag: member="ost::MemPager::MemPagerObject" ref="ac5ec8bc6fca4e4e6a8faa45d4b0a9d58" args="" -->
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<table class="memname">
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<td class="memname">friend class <a class="el" href="classost_1_1_mem_pager_object.html">MemPagerObject</a><code> [friend]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
</div>
<a class="anchor" id="a7fb804f7dc96dd9f705c84095f37f1ca"></a><!-- doxytag: member="ost::MemPager::String" ref="a7fb804f7dc96dd9f705c84095f37f1ca" args="" -->
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<td class="memname">friend class <a class="el" href="classost_1_1_string.html">String</a><code> [friend]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
</div>
</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="misc_8h_source.html">misc.h</a></li>
</ul>
</div>
<hr class="footer"/><address style="text-align: right;"><small>Generated on Fri Nov 12 09:55:47 2010 for GNU CommonC++ by
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