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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_cond_signal</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_1252"> </a>NAME</h4><blockquote>pthread_cond_signal, pthread_cond_broadcast - signal or broadcast acondition</blockquote><h4><a name = "tag_000_007_1253"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="pthread.h.html">pthread.h</a>>int pthread_cond_signal(pthread_cond_t *<i>cond</i>);int pthread_cond_broadcast(pthread_cond_t *<i>cond</i>);</code></pre></blockquote><h4><a name = "tag_000_007_1254"> </a>DESCRIPTION</h4><blockquote>These two functions are used to unblockthreads blocked on a condition variable.<p>The<i>pthread_cond_signal()</i>call unblocks at least one of the threads that are blocked on thespecified condition variable<i>cond</i>(if any threads are blocked on<i>cond</i>).<p>The<i>pthread_cond_broadcast()</i>call unblocks all threads currently blocked on the specified condition variable<i>cond</i>.<p>If more than one thread is blocked on a condition variable,the scheduling policy determines the order in which threads are unblocked.When each thread unblocked as a result of a<i>pthread_cond_signal()</i>or<i>pthread_cond_broadcast()</i>returns from its call to<i><a href="pthread_cond_wait.html">pthread_cond_wait()</a></i>or<i><a href="pthread_cond_timedwait.html">pthread_cond_timedwait()</a></i>,the thread owns the mutex with which it called<i><a href="pthread_cond_wait.html">pthread_cond_wait()</a></i>or<i><a href="pthread_cond_timedwait.html">pthread_cond_timedwait()</a></i>.The thread(s) that are unblocked contend for the mutexaccording to the scheduling policy (if applicable),and as if each had called<i><a href="pthread_mutex_lock.html">pthread_mutex_lock()</a></i>.<p>The<i>pthread_cond_signal()</i>or<i>pthread_cond_broadcast()</i>functions may be called by a thread whether or not itcurrently owns the mutex that threads calling<i><a href="pthread_cond_wait.html">pthread_cond_wait()</a></i>or<i><a href="pthread_cond_timedwait.html">pthread_cond_timedwait()</a></i>have associated with the condition variable during their waits;however, if predictable scheduling behaviour is required,then that mutex is locked by the thread calling<i>pthread_cond_signal()</i>or<i>pthread_cond_broadcast()</i>.<p>The<i>pthread_cond_signal()</i>and<i>pthread_cond_broadcast()</i>functions have no effect if there are no threadscurrently blocked on<i>cond</i>.</blockquote><h4><a name = "tag_000_007_1255"> </a>RETURN VALUE</h4><blockquote>If successful, the<i>pthread_cond_signal()</i>and<i>pthread_cond_broadcast()</i>functions return zero.Otherwise, an error number is returned to indicate the error.</blockquote><h4><a name = "tag_000_007_1256"> </a>ERRORS</h4><blockquote>The <i>pthread_cond_signal()</i>and<i>pthread_cond_broadcast()</i>function may fail if:<dl compact><dt>[EINVAL]<dd>The value<i>cond</i>does not refer to an initialised condition variable.</dl><p>These functions will not return an error code of [EINTR].</blockquote><h4><a name = "tag_000_007_1257"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1258"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1259"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1260"> </a>SEE ALSO</h4><blockquote><i><a href="pthread_cond_init.html">pthread_cond_init()</a></i>,<i><a href="pthread_cond_wait.html">pthread_cond_wait()</a></i>,<i><a href="pthread_cond_timedwait.html">pthread_cond_timedwait()</a></i>,<i><a href="pthread.h.html"><pthread.h></a></i>.<br></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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