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HTML
189 lines
7.4 KiB
HTML
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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<title>DbEnv::mutex_set_init()</title>
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<link rel="stylesheet" href="apiReference.css" type="text/css" />
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2" />
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<link rel="start" href="index.html" title="Berkeley DB C++ API Reference" />
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<link rel="up" href="mutex.html" title="Chapter 10. Mutex Methods" />
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<link rel="prev" href="mutexset_increment.html" title="DbEnv::mutex_set_increment()" />
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<link rel="next" href="mutexset_max.html" title="DbEnv::mutex_set_max()" />
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</head>
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<body>
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<div xmlns="" class="navheader">
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<div class="libver">
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<p>Library Version 11.2.5.2</p>
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</div>
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<table width="100%" summary="Navigation header">
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<tr>
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<th colspan="3" align="center">DbEnv::mutex_set_init()</th>
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</tr>
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<tr>
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<td width="20%" align="left"><a accesskey="p" href="mutexset_increment.html">Prev</a> </td>
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<th width="60%" align="center">Chapter 10.
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Mutex Methods
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</th>
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<td width="20%" align="right"> <a accesskey="n" href="mutexset_max.html">Next</a></td>
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</tr>
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</table>
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<hr />
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</div>
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<div class="sect1" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h2 class="title" style="clear: both"><a id="mutexset_init"></a>DbEnv::mutex_set_init()</h2>
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</div>
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</div>
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</div>
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<pre class="programlisting">#include <db_cxx.h>
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int
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DbEnv::mutex_set_init(u_int32_t init); </pre>
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<p>
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Configure the inital number of mutexes to allocate.
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</p>
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<p>
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Berkeley DB allocates a default number of mutexes based on the
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initial configuration of the database environment. The
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<code class="methodname">DbEnv::mutex_set_init()</code> method is used to
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override this default number of mutexes to allocate. This may be done
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to either speed up startup, or to force more work to be done at
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startup to avoid later contention due to allocation.
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</p>
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<p>
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The database environment's inital number of mutexes may also be
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configured using the environment's <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file. The syntax
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of the entry in that file is a single line with the string
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"mutex_set_init", one or more whitespace characters, and the
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initial number of mutexes. Because the <a href="../../programmer_reference/env_db_config.html#env_db_config.DB_CONFIG" class="olink">DB_CONFIG</a> file is read
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when the database environment is opened, it will silently overrule
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configuration done before that time.
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</p>
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<p>
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The <code class="methodname">DbEnv::mutex_set_init()</code> method
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configures a database environment, not only operations performed
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using the specified <a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
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handle.
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</p>
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<p>
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The <code class="methodname">DbEnv::mutex_set_init()</code> method may not
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be called after the
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<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> method is
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called. If the database environment already exists when
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<a class="xref" href="envopen.html" title="DbEnv::open()">DbEnv::open()</a> is called, the
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information specified to
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<code class="methodname">DbEnv::mutex_set_init()</code> will be ignored.
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</p>
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<p>
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The <code class="methodname">DbEnv::mutex_set_init()</code> <span>
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<span>
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method either returns a non-zero error value or throws an
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exception that encapsulates a non-zero error value on
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failure, and returns 0 on success.
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</span>
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</span>
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</p>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3653608"></a>Parameters</h3>
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</div>
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</div>
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</div>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3653606"></a>init</h4>
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</div>
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</div>
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</div>
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<p>
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The <span class="bold"><strong>init</strong></span> parameter is the absolute
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number of mutexes to allocate.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3653426"></a>Errors</h3>
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</div>
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</div>
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</div>
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<p>
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The <code class="methodname">DbEnv::mutex_set_init()</code> <span>
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<span>
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method may fail and throw a <a class="link" href="dbexception.html" title="Chapter 6. The DbException Class">DbException</a>
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exception, encapsulating one of the following non-zero errors, or return one
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of the following non-zero errors:
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</span>
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</span>
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</p>
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<div class="sect3" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h4 class="title"><a id="id3653751"></a>EINVAL</h4>
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</div>
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</div>
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</div>
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<p>
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An invalid flag value or parameter was specified.
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</p>
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</div>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3653729"></a>Class</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="link" href="env.html" title="Chapter 5. The DbEnv Handle">DbEnv</a>
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</p>
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</div>
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<div class="sect2" lang="en" xml:lang="en">
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<div class="titlepage">
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<div>
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<div>
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<h3 class="title"><a id="id3653657"></a>See Also</h3>
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</div>
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</div>
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</div>
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<p>
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<a class="xref" href="mutex.html#mutexlist" title="Mutex Methods">Mutex Methods</a>
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</p>
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</div>
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</div>
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<div class="navfooter">
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<hr />
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<table width="100%" summary="Navigation footer">
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<tr>
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<td width="40%" align="left"><a accesskey="p" href="mutexset_increment.html">Prev</a> </td>
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|||
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<td width="20%" align="center">
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|||
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<a accesskey="u" href="mutex.html">Up</a>
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</td>
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|||
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<td width="40%" align="right"> <a accesskey="n" href="mutexset_max.html">Next</a></td>
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</tr>
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<tr>
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<td width="40%" align="left" valign="top">DbEnv::mutex_set_increment() </td>
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<td width="20%" align="center">
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<a accesskey="h" href="index.html">Home</a>
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</td>
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<td width="40%" align="right" valign="top"> DbEnv::mutex_set_max()</td>
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</tr>
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</table>
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</div>
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</body>
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</html>
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