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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_attr_setschedpolicy</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_1162"> </a>NAME</h4><blockquote>pthread_attr_setschedpolicy, pthread_attr_getschedpolicy- set and get schedpolicy attribute(<b>REALTIME THREADS</b>)</blockquote><h4><a name = "tag_000_007_1163"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="pthread.h.html">pthread.h</a>>int pthread_attr_setschedpolicy(pthread_attr_t *<i>attr</i>, int <i>policy</i>);int pthread_attr_getschedpolicy(const pthread_attr_t *<i>attr</i>, int *<i>policy</i>);</code></pre></blockquote><h4><a name = "tag_000_007_1164"> </a>DESCRIPTION</h4><blockquote>The functions<i>pthread_attr_setschedpolicy()</i>and<i>pthread_attr_getschedpolicy()</i>,respectively, set and get the<i>schedpolicy</i>attribute in the<i>attr</i>argument.<p>The supported values of<i>policy</i>include SCHED_FIFO, SCHED_RR and SCHED_OTHER,which are defined by the header<i><a href="sched.h.html"><sched.h></a></i>.When threads executing with the scheduling policySCHED_FIFO or SCHED_RR are waiting on a mutex,they acquire the mutex in priority order when the mutex is unlocked.</blockquote><h4><a name = "tag_000_007_1165"> </a>RETURN VALUE</h4><blockquote>If successful, the<i>pthread_attr_setschedpolicy()</i>and<i>pthread_attr_getschedpolicy()</i>functions return zero.Otherwise, an error number is returned to indicate the error.</blockquote><h4><a name = "tag_000_007_1166"> </a>ERRORS</h4><blockquote>The <i>pthread_attr_setschedpolicy()</i>and<i>pthread_attr_getschedpolicy()</i>functions will fail if:<dl compact><dt>[ENOSYS]<dd>The option _POSIX_THREAD_PRIORITY_SCHEDULING is not defined and theimplementation does not support the function.</dl><p>The<i>pthread_attr_setschedpolicy()</i>function may fail if:<dl compact><dt>[EINVAL]<dd>The value of the attribute being set is not valid.<dt>[ENOTSUP]<dd>An attempt was made to set the attribute to an unsupported value.</dl></blockquote><h4><a name = "tag_000_007_1167"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1168"> </a>APPLICATION USAGE</h4><blockquote>After these attributes have been set, a thread can be created withthe specified attributes using<i><a href="pthread_create.html">pthread_create()</a></i>.Using these routines does not affect the current running thread.</blockquote><h4><a name = "tag_000_007_1169"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1170"> </a>SEE ALSO</h4><blockquote><i><a href="pthread_attr_init.html">pthread_attr_init()</a></i>,<i><a href="pthread_attr_setscope.html">pthread_attr_setscope()</a></i>,<i><a href="pthread_attr_setinheritsched.html">pthread_attr_setinheritsched()</a></i>,<i><a href="pthread_attr_setschedparam.html">pthread_attr_setschedparam()</a></i>,<i><a href="pthread_create.html">pthread_create()</a></i>,<i><a href="pthread.h.html"><pthread.h></a></i>,<i><a href="pthread_setschedparam.html">pthread_setschedparam()</a></i>,<i><a href="sched.h.html"><sched.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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