<!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>Decreases the count of the semaphore or waits</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="syncsemaphore.construct.html">SyncSemaphore::__construct</a></div> <div class="next" style="text-align: right; float: right;"><a href="syncsemaphore.unlock.html">SyncSemaphore::unlock</a></div> <div class="up"><a href="class.syncsemaphore.html">SyncSemaphore</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="syncsemaphore.lock" class="refentry"> <div class="refnamediv"> <h1 class="refname">SyncSemaphore::lock</h1> <p class="verinfo">(PECL sync >= 1.0.0)</p><p class="refpurpose"><span class="refname">SyncSemaphore::lock</span> — <span class="dc-title">Decreases the count of the semaphore or waits</span></p> </div> <div class="refsect1 description" id="refsect1-syncsemaphore.lock-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="modifier">public</span> <span class="type">bool</span> <span class="methodname"><strong>SyncSemaphore::lock</strong></span> ([ <span class="methodparam"><span class="type">int</span> <code class="parameter">$wait</code><span class="initializer"> = -1</span></span> ] )</div> <p class="para rdfs-comment"> Decreases the count of a SyncSemaphore object or waits until the semaphore becomes non-zero. </p> </div> <div class="refsect1 parameters" id="refsect1-syncsemaphore.lock-parameters"> <h3 class="title">Parameters</h3> <dl> <dt> <code class="parameter">wait</code></dt> <dd> <p class="para"> The number of milliseconds to wait for the semaphore. A value of -1 is infinite. </p> </dd> </dl> </div> <div class="refsect1 returnvalues" id="refsect1-syncsemaphore.lock-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> A boolean of TRUE if the lock operation was successful, FALSE otherwise. </p> </div> <div class="refsect1 examples" id="refsect1-syncsemaphore.lock-examples"> <h3 class="title">Examples</h3> <div class="example" id="example-4595"> <p><strong>Example #1 <span class="function"><strong>SyncSemaphore::lock()</strong></span> example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$semaphore </span><span style="color: #007700">= new </span><span style="color: #0000BB">SyncSemaphore</span><span style="color: #007700">(</span><span style="color: #DD0000">"LimitedResource_2clients"</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /><br />if (!</span><span style="color: #0000BB">$semaphore</span><span style="color: #007700">-></span><span style="color: #0000BB">lock</span><span style="color: #007700">(</span><span style="color: #0000BB">3000</span><span style="color: #007700">))<br />{<br /> echo </span><span style="color: #DD0000">"Unable to lock semaphore."</span><span style="color: #007700">;<br /><br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* ... */<br /><br /></span><span style="color: #0000BB">$semaphore</span><span style="color: #007700">-></span><span style="color: #0000BB">unlock</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </div> <div class="refsect1 seealso" id="refsect1-syncsemaphore.lock-seealso"> <h3 class="title">See Also</h3> <ul class="simplelist"> <li class="member"><span class="methodname"><a href="syncsemaphore.unlock.html" class="methodname" rel="rdfs-seeAlso">SyncSemaphore::unlock()</a> - Increases the count of the semaphore</span></li> </ul> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="syncsemaphore.construct.html">SyncSemaphore::__construct</a></div> <div class="next" style="text-align: right; float: right;"><a href="syncsemaphore.unlock.html">SyncSemaphore::unlock</a></div> <div class="up"><a href="class.syncsemaphore.html">SyncSemaphore</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>