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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>pthread_mutexattr_init</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_1522"> </a>NAME</h4><blockquote>pthread_mutexattr_init, pthread_mutexattr_destroy- initialise and destroy mutex attributes object</blockquote><h4><a name = "tag_000_007_1523"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="pthread.h.html">pthread.h</a>>int pthread_mutexattr_init(pthread_mutexattr_t *<i>attr</i>);int pthread_mutexattr_destroy(pthread_mutexattr_t *<i>attr</i>);</code></pre></blockquote><h4><a name = "tag_000_007_1524"> </a>DESCRIPTION</h4><blockquote>The function<i>pthread_mutexattr_init()</i>initialises a mutex attributes object<i>attr</i>with the default value for all of the attributesdefined by the implementation.<p>The effect of initialising an already initialised mutex attributes object is undefined.<p>After a mutex attributes object has been usedto initialise one or more mutexes,any function affecting the attributes object (including destruction)does not affect any previously initialised mutexes.<p>The<i>pthread_mutexattr_destroy()</i>function destroys a mutex attributes object;the object becomes, in effect, uninitialised.An implementation may cause<i>pthread_mutexattr_destroy()</i>to set the object referenced by<i>attr</i>to an invalid value.A destroyed mutex attributes objectcan be re-initialised using<i>pthread_mutexattr_init()</i>;the results of otherwise referencing the object after it has been destroyed are undefined.</blockquote><h4><a name = "tag_000_007_1525"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>pthread_mutexattr_init()</i>and<i>pthread_mutexattr_destroy()</i>return zero.Otherwise, an error number is returned to indicate the error.</blockquote><h4><a name = "tag_000_007_1526"> </a>ERRORS</h4><blockquote>The <i>pthread_mutexattr_init()</i>function may fail if:<dl compact><dt>[ENOMEM]<dd>Insufficient memory exists to initialise the mutex attributes object.</dl><p>The<i>pthread_mutexattr_destroy()</i>function may fail if:<dl compact><dt>[EINVAL]<dd>The value specified by<i>attr</i>is invalid.</dl><p>These functions will not return an error code of [EINTR].</blockquote><h4><a name = "tag_000_007_1527"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1528"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1529"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1530"> </a>SEE ALSO</h4><blockquote><i><a href="pthread_create.html">pthread_create()</a></i>,<i><a href="pthread_mutex_init.html">pthread_mutex_init()</a></i>,<i>pthread_mutexattr_init()</i>,<i><a href="pthread_cond_init.html">pthread_cond_init()</a></i>,<i><a href="pthread.h.html"><pthread.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Threads Extension (1003.1c-1995)</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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