<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Release a semaphore</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.sem-get.html">sem_get</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.sem-remove.html">sem_remove</a></div> <div class="up"><a href="ref.sem.html">Semaphore Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.sem-release" class="refentry"> <div class="refnamediv"> <h1 class="refname">sem_release</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">sem_release</span> — <span class="dc-title">Release a semaphore</span></p> </div> <div class="refsect1 description" id="refsect1-function.sem-release-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><strong>sem_release</strong></span> ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$sem_identifier</code></span> )</div> <p class="para rdfs-comment"> <span class="function"><strong>sem_release()</strong></span> releases the semaphore if it is currently acquired by the calling process, otherwise a warning is generated. </p> <p class="para"> After releasing the semaphore, <span class="function"><a href="function.sem-acquire.html" class="function">sem_acquire()</a></span> may be called to re-acquire it. </p> </div> <div class="refsect1 parameters" id="refsect1-function.sem-release-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><em><code class="parameter">sem_identifier</code></em></span> <dd> <p class="para"> A Semaphore resource handle as returned by <span class="function"><a href="function.sem-get.html" class="function">sem_get()</a></span>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.sem-release-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <strong><code>TRUE</code></strong> on success or <strong><code>FALSE</code></strong> on failure. </p> </div> <div class="refsect1 seealso" id="refsect1-function.sem-release-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"> <span class="function"><a href="function.sem-get.html" class="function" rel="rdfs-seeAlso">sem_get()</a> - Get a semaphore id</span></li> <li class="member"> <span class="function"><a href="function.sem-acquire.html" class="function" rel="rdfs-seeAlso">sem_acquire()</a> - Acquire a semaphore</span></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.sem-get.html">sem_get</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.sem-remove.html">sem_remove</a></div> <div class="up"><a href="ref.sem.html">Semaphore Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>