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>DB_ENV->mutex_free()</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="mutex.html" title="Chapter 9. Mutex Methods" /> 11 <link rel="prev" href="mutexalloc.html" title="DB_ENV->mutex_alloc()" /> 12 <link rel="next" href="mutexget_align.html" title="DB_ENV->mutex_get_align()" /> 13 </head> 14 <body> 15 <div class="navheader"> 16 <table width="100%" summary="Navigation header"> 17 <tr> 18 <th colspan="3" align="center">DB_ENV->mutex_free()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="mutexalloc.html">Prev</a> </td> 22 <th width="60%" align="center">Chapter 9. 23 Mutex Methods 24 </th> 25 <td width="20%" align="right"> <a accesskey="n" href="mutexget_align.html">Next</a></td> 26 </tr> 27 </table> 28 <hr /> 29 </div> 30 <div class="sect1" lang="en" xml:lang="en"> 31 <div class="titlepage"> 32 <div> 33 <div> 34 <h2 class="title" style="clear: both"><a id="mutexfree"></a>DB_ENV->mutex_free()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB_ENV->mutex_free(DB_ENV *dbenv, db_mutex_t mutex); </pre> 42 <p> 43 The <code class="methodname">DB_ENV->mutex_free()</code> method discards a mutex allocated by 44 <a class="xref" href="mutexalloc.html" title="DB_ENV->mutex_alloc()">DB_ENV->mutex_alloc()</a>. 45 </p> 46 <p> 47 The <code class="methodname">DB_ENV->mutex_free()</code> method may not be called before the 48 <a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a> method is called. 49 </p> 50 <p> 51 The <code class="methodname">DB_ENV->mutex_free()</code> <span> 52 <span> 53 method returns a non-zero error value on failure and 0 on success. 54 </span> 55 56 </span> 57 </p> 58 <div class="sect2" lang="en" xml:lang="en"> 59 <div class="titlepage"> 60 <div> 61 <div> 62 <h3 class="title"><a id="id1693078"></a>Parameters</h3> 63 </div> 64 </div> 65 </div> 66 <div class="sect3" lang="en" xml:lang="en"> 67 <div class="titlepage"> 68 <div> 69 <div> 70 <h4 class="title"><a id="id1693308"></a>mutex</h4> 71 </div> 72 </div> 73 </div> 74 <p> 75 The <span class="bold"><strong>mutex</strong></span> parameter is a mutex 76 previously allocated by 77 <a class="xref" href="mutexalloc.html" title="DB_ENV->mutex_alloc()">DB_ENV->mutex_alloc()</a>. 78 </p> 79 </div> 80 </div> 81 <div class="sect2" lang="en" xml:lang="en"> 82 <div class="titlepage"> 83 <div> 84 <div> 85 <h3 class="title"><a id="id1693665"></a>Errors</h3> 86 </div> 87 </div> 88 </div> 89 <p> 90 The <code class="methodname">DB_ENV->mutex_free()</code> <span> 91 <span> 92 method may fail and return one of the following non-zero errors: 93 </span> 94 95 </span> 96 </p> 97 <div class="sect3" lang="en" xml:lang="en"> 98 <div class="titlepage"> 99 <div> 100 <div> 101 <h4 class="title"><a id="id1693524"></a>EINVAL</h4> 102 </div> 103 </div> 104 </div> 105 <p> 106 An invalid flag value or parameter was specified. 107 </p> 108 </div> 109 </div> 110 <div class="sect2" lang="en" xml:lang="en"> 111 <div class="titlepage"> 112 <div> 113 <div> 114 <h3 class="title"><a id="id1693670"></a>Class</h3> 115 </div> 116 </div> 117 </div> 118 <p> 119 <a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a> 120 </p> 121 </div> 122 <div class="sect2" lang="en" xml:lang="en"> 123 <div class="titlepage"> 124 <div> 125 <div> 126 <h3 class="title"><a id="id1693527"></a>See Also</h3> 127 </div> 128 </div> 129 </div> 130 <p> 131 <a class="xref" href="mutex.html#mutexlist" title="Mutex Methods">Mutex Methods</a> 132 </p> 133 </div> 134 </div> 135 <div class="navfooter"> 136 <hr /> 137 <table width="100%" summary="Navigation footer"> 138 <tr> 139 <td width="40%" align="left"><a accesskey="p" href="mutexalloc.html">Prev</a> </td> 140 <td width="20%" align="center"> 141 <a accesskey="u" href="mutex.html">Up</a> 142 </td> 143 <td width="40%" align="right"> <a accesskey="n" href="mutexget_align.html">Next</a></td> 144 </tr> 145 <tr> 146 <td width="40%" align="left" valign="top">DB_ENV->mutex_alloc() </td> 147 <td width="20%" align="center"> 148 <a accesskey="h" href="index.html">Home</a> 149 </td> 150 <td width="40%" align="right" valign="top"> DB_ENV->mutex_get_align()</td> 151 </tr> 152 </table> 153 </div> 154 </body> 155</html> 156