1<?xml version="1.0" encoding="UTF-8" standalone="no"?> 2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3<html xmlns="http://www.w3.org/1999/xhtml"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 6 <title>Chapter��9.�� Mutex Methods</title> 7 <link rel="stylesheet" href="apiReference.css" type="text/css" /> 8 <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> 9 <link rel="start" href="index.html" title="Berkeley DB C API Reference" /> 10 <link rel="up" href="index.html" title="Berkeley DB C API Reference" /> 11 <link rel="prev" href="mempset_priority.html" title="DB_MPOOLFILE->set_priority()" /> 12 <link rel="next" href="mutexalloc.html" title="DB_ENV->mutex_alloc()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">Chapter��9.�� 19 Mutex Methods 20 </th> 21 </tr> 22 <tr> 23 <td width="20%" align="left"><a accesskey="p" href="mempset_priority.html">Prev</a>��</td> 24 <th width="60%" align="center">��</th> 25 <td width="20%" align="right">��<a accesskey="n" href="mutexalloc.html">Next</a></td> 26 </tr> 27 </table> 28 <hr /> 29 </div> 30 <div class="chapter" lang="en" xml:lang="en"> 31 <div class="titlepage"> 32 <div> 33 <div> 34 <h2 class="title"><a id="mutex"></a>Chapter��9.�� 35 Mutex Methods 36 </h2> 37 </div> 38 </div> 39 </div> 40 <p> 41 This chapter describes methods that can be used to manage 42 mutexes within DB. Many of the methods described here 43 are used to configure DB's internal mutex system. 44 However, a series of APIs are available for use as a 45 general-purpose, cross platform mutex management system. 46 These methods can be used independently of DB's main 47 purpose, which is as a high-end data management engine. 48 </p> 49 <div class="sect1" lang="en" xml:lang="en"> 50 <div class="titlepage"> 51 <div> 52 <div> 53 <h2 class="title" style="clear: both"><a id="mutexlist"></a>Mutex Methods</h2> 54 </div> 55 </div> 56 </div> 57 <div class="navtable"> 58 <table border="1" width="80%"> 59 <thead> 60 <tr> 61 <th>Mutexes and Related Methods</th> 62 <th>Description</th> 63 </tr> 64 </thead> 65 <tbody> 66 <tr> 67 <td> 68 <a class="xref" href="mutexalloc.html" title="DB_ENV->mutex_alloc()">DB_ENV->mutex_alloc()</a> 69 </td> 70 <td>Allocate a mutex</td> 71 </tr> 72 <tr> 73 <td> 74 <a class="xref" href="mutexfree.html" title="DB_ENV->mutex_free()">DB_ENV->mutex_free()</a> 75 </td> 76 <td>Free a mutex</td> 77 </tr> 78 <tr> 79 <td> 80 <a class="xref" href="mutexlock.html" title="DB_ENV->mutex_lock()">DB_ENV->mutex_lock()</a> 81 </td> 82 <td>Lock a mutex</td> 83 </tr> 84 <tr> 85 <td> 86 <a class="xref" href="mutexstat.html" title="DB_ENV->mutex_stat()">DB_ENV->mutex_stat()</a> 87 </td> 88 <td>Mutex statistics</td> 89 </tr> 90 <tr> 91 <td> 92 <a class="xref" href="mutexstat_print.html" title="DB_ENV->mutex_stat_print()">DB_ENV->mutex_stat_print()</a> 93 </td> 94 <td>Print mutex statistics</td> 95 </tr> 96 <tr> 97 <td> 98 <a class="xref" href="mutexunlock.html" title="DB_ENV->mutex_unlock()">DB_ENV->mutex_unlock()</a> 99 </td> 100 <td>Unlock a mutex</td> 101 </tr> 102 <tr> 103 <td colspan="2"> 104 <span class="bold"> 105 <strong>Mutex Configuration</strong> 106 </span> 107 </td> 108 </tr> 109 <tr> 110 <td><a class="xref" href="mutexset_align.html" title="DB_ENV->mutex_set_align()">DB_ENV->mutex_set_align()</a>, <a class="xref" href="mutexget_align.html" title="DB_ENV->mutex_get_align()">DB_ENV->mutex_get_align()</a></td> 111 <td>Configure mutex alignment</td> 112 </tr> 113 <tr> 114 <td><a class="xref" href="mutexset_increment.html" title="DB_ENV->mutex_set_increment()">DB_ENV->mutex_set_increment()</a>, <a class="xref" href="mutexget_increment.html" title="DB_ENV->mutex_get_increment()">DB_ENV->mutex_get_increment()</a></td> 115 <td>Configure number of additional mutexes</td> 116 </tr> 117 <tr> 118 <td><a class="xref" href="mutexset_max.html" title="DB_ENV->mutex_set_max()">DB_ENV->mutex_set_max()</a>, <a class="xref" href="mutexget_max.html" title="DB_ENV->mutex_get_max()">DB_ENV->mutex_get_max()</a></td> 119 <td>Configure total number of mutexes</td> 120 </tr> 121 <tr> 122 <td><a class="xref" href="mutexset_tas_spins.html" title="DB_ENV->mutex_set_tas_spins()">DB_ENV->mutex_set_tas_spins()</a>, <a class="xref" href="mutexget_tas_spins.html" title="DB_ENV->mutex_get_tas_spins()">DB_ENV->mutex_get_tas_spins()</a></td> 123 <td>Configure test-and-set mutex spin count</td> 124 </tr> 125 </tbody> 126 </table> 127 </div> 128 </div> 129 </div> 130 <div class="navfooter"> 131 <hr /> 132 <table width="100%" summary="Navigation footer"> 133 <tr> 134 <td width="40%" align="left"><a accesskey="p" href="mempset_priority.html">Prev</a>��</td> 135 <td width="20%" align="center">��</td> 136 <td width="40%" align="right">��<a accesskey="n" href="mutexalloc.html">Next</a></td> 137 </tr> 138 <tr> 139 <td width="40%" align="left" valign="top">DB_MPOOLFILE->set_priority()��</td> 140 <td width="20%" align="center"> 141 <a accesskey="h" href="index.html">Home</a> 142 </td> 143 <td width="40%" align="right" valign="top">��DB_ENV->mutex_alloc()</td> 144 </tr> 145 </table> 146 </div> 147 </body> 148</html> 149