<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <title>GNU CommonC++: ost::MemPager Class Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body> <!-- Generated by Doxygen 1.6.3 --> <div class="navigation" id="top"> <div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li class="current"><a href="annotated.html"><span>Classes</span></a></li> <li><a href="files.html"><span>Files</span></a></li> <li><a href="examples.html"><span>Examples</span></a></li> </ul> </div> <div class="tabs"> <ul> <li><a href="annotated.html"><span>Class List</span></a></li> <li><a href="classes.html"><span>Class Index</span></a></li> <li><a href="hierarchy.html"><span>Class Hierarchy</span></a></li> <li><a href="functions.html"><span>Class Members</span></a></li> </ul> </div> <div class="navpath"><a class="el" href="namespaceost.html">ost</a>::<a class="el" href="classost_1_1_mem_pager.html">MemPager</a> </div> </div> <div class="contents"> <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)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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="()" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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="" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <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 <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.3 </small></address> </body> </html>