📄 sem_destroy.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>sem_destroy</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_008_279"> </a>NAME</h4><blockquote>sem_destroy - destroy an unnamed semaphore(<b>REALTIME</b>)</blockquote><h4><a name = "tag_000_008_280"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="semaphore.h.html">semaphore.h</a>>int sem_destroy(sem_t *<i>sem</i>);</code></pre></blockquote><h4><a name = "tag_000_008_281"> </a>DESCRIPTION</h4><blockquote>The<i>sem_destroy()</i>function is used to destroy the unnamed semaphore indicated by<i>sem</i>.Only a semaphore that was created using<i><a href="sem_init.html">sem_init()</a></i>may be destroyed using<i>sem_destroy()</i>;the effect of calling<i>sem_destroy()</i>with a named semaphore is undefined.The effect of subsequent use of the semaphore<i>sem</i>is undefined until<i>sem</i>is re-initialised by another call to<i><a href="sem_init.html">sem_init()</a></i>.<p>It is safe to destroy an initialised semaphore upon which no threadsare currently blocked.The effect of destroying a semaphoreupon which other threads are currently blocked is undefined.</blockquote><h4><a name = "tag_000_008_282"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,a value of zero is returned.Otherwise,a value of -1is returned and<i>errno</i>is set to indicatethe error.</blockquote><h4><a name = "tag_000_008_283"> </a>ERRORS</h4><blockquote>The <i>sem_destroy()</i>function will fail if:<dl compact><dt>[EINVAL]<dd>The<i>sem</i>argument is not a valid semaphore.<dt>[ENOSYS]<dd>The function<i>sem_destroy()</i>is not supported by this implementation.</dl><p>The <i>sem_destroy()</i>function may fail if:<dl compact><dt>[EBUSY]<dd>There are currently processes blocked on the semaphore.</dl></blockquote><h4><a name = "tag_000_008_284"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_285"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_286"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_287"> </a>SEE ALSO</h4><blockquote><i><a href="semctl.html">semctl()</a></i>,<i><a href="semget.html">semget()</a></i>,<i><a href="semop.html">semop()</a></i>,<i><a href="sem_init.html">sem_init()</a></i>,<i><a href="sem_open.html">sem_open()</a></i>,<i><a href="semaphore.h.html"><semaphore.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Realtime Extension (1003.1b-1993/1003.1i-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
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -