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_lock()</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="mutexget_tas_spins.html" title="DB_ENV->mutex_get_tas_spins()" /> 12 <link rel="next" href="mutexset_align.html" title="DB_ENV->mutex_set_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_lock()</th> 19 </tr> 20 <tr> 21 <td width="20%" align="left"><a accesskey="p" href="mutexget_tas_spins.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="mutexset_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="mutexlock"></a>DB_ENV->mutex_lock()</h2> 35 </div> 36 </div> 37 </div> 38 <pre class="programlisting">#include <db.h> 39 40int 41DB_ENV->mutex_lock(DB_ENV *dbenv, db_mutex_t mutex); </pre> 42 <p> 43 The <code class="methodname">DB_ENV->mutex_lock()</code> method locks the mutex allocated by 44 <a class="xref" href="mutexalloc.html" title="DB_ENV->mutex_alloc()">DB_ENV->mutex_alloc()</a>. The 45 thread of control calling <code class="methodname">DB_ENV->mutex_lock()</code> will block until the 46 lock is available. 47 </p> 48 <p> 49 The <code class="methodname">DB_ENV->mutex_lock()</code> <span> 50 <span> 51 method returns a non-zero error value on failure and 0 on success. 52 </span> 53 54 </span> 55 </p> 56 <div class="sect2" lang="en" xml:lang="en"> 57 <div class="titlepage"> 58 <div> 59 <div> 60 <h3 class="title"><a id="id1694034"></a>Parameters</h3> 61 </div> 62 </div> 63 </div> 64 <div class="sect3" lang="en" xml:lang="en"> 65 <div class="titlepage"> 66 <div> 67 <div> 68 <h4 class="title"><a id="id1694027"></a>mutex</h4> 69 </div> 70 </div> 71 </div> 72 <p> 73 The <span class="bold"><strong>mutex</strong></span> parameter is a mutex 74 previously allocated by <a class="xref" href="mutexalloc.html" title="DB_ENV->mutex_alloc()">DB_ENV->mutex_alloc()</a>. 75 </p> 76 </div> 77 </div> 78 <div class="sect2" lang="en" xml:lang="en"> 79 <div class="titlepage"> 80 <div> 81 <div> 82 <h3 class="title"><a id="id1694035"></a>Errors</h3> 83 </div> 84 </div> 85 </div> 86 <p> 87 The <code class="methodname">DB_ENV->mutex_lock()</code> <span> 88 <span> 89 method may fail and return one of the following non-zero errors: 90 </span> 91 92 </span> 93 </p> 94 <div class="sect3" lang="en" xml:lang="en"> 95 <div class="titlepage"> 96 <div> 97 <div> 98 <h4 class="title"><a id="id1694315"></a>EINVAL</h4> 99 </div> 100 </div> 101 </div> 102 <p> 103 An invalid flag value or parameter was specified. 104 </p> 105 </div> 106 </div> 107 <div class="sect2" lang="en" xml:lang="en"> 108 <div class="titlepage"> 109 <div> 110 <div> 111 <h3 class="title"><a id="id1693917"></a>Class</h3> 112 </div> 113 </div> 114 </div> 115 <p> 116 <a class="link" href="env.html" title="Chapter��5.�� The DB_ENV Handle">DB_ENV</a> 117 </p> 118 </div> 119 <div class="sect2" lang="en" xml:lang="en"> 120 <div class="titlepage"> 121 <div> 122 <div> 123 <h3 class="title"><a id="id1694316"></a>See Also</h3> 124 </div> 125 </div> 126 </div> 127 <p> 128 <a class="xref" href="mutex.html#mutexlist" title="Mutex Methods">Mutex Methods</a> 129 </p> 130 </div> 131 </div> 132 <div class="navfooter"> 133 <hr /> 134 <table width="100%" summary="Navigation footer"> 135 <tr> 136 <td width="40%" align="left"><a accesskey="p" href="mutexget_tas_spins.html">Prev</a>��</td> 137 <td width="20%" align="center"> 138 <a accesskey="u" href="mutex.html">Up</a> 139 </td> 140 <td width="40%" align="right">��<a accesskey="n" href="mutexset_align.html">Next</a></td> 141 </tr> 142 <tr> 143 <td width="40%" align="left" valign="top">DB_ENV->mutex_get_tas_spins()��</td> 144 <td width="20%" align="center"> 145 <a accesskey="h" href="index.html">Home</a> 146 </td> 147 <td width="40%" align="right" valign="top">��DB_ENV->mutex_set_align()</td> 148 </tr> 149 </table> 150 </div> 151 </body> 152</html> 153