<!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>Returns a bit mask of recommended backends for current platform.</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ev.nowupdate.html">Ev::nowUpdate</a></div> <div class="next" style="text-align: right; float: right;"><a href="ev.resume.html">Ev::resume</a></div> <div class="up"><a href="class.ev.html">Ev</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="ev.recommendedbackends" class="refentry"> <div class="refnamediv"> <h1 class="refname">Ev::recommendedBackends</h1> <p class="verinfo">(PECL ev >= 0.2.0)</p><p class="refpurpose"><span class="refname">Ev::recommendedBackends</span> — <span class="dc-title">Returns a bit mask of recommended backends for current platform.</span></p> </div> <div class="refsect1 description" id="refsect1-ev.recommendedbackends-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="modifier">final</span> <span class="modifier">public</span> <span class="modifier">static</span> <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>Ev::recommendedBackends</strong></span> ( <span class="methodparam">void</span> )</div> <p class="para rdfs-comment"> Returns the set of all backends compiled into this binary of <em>libev</em> and also recommended for this platform, meaning it will work for most file descriptor types. This set is often smaller than the one returned by <span class="function"><strong>ev_supported_backends()</strong></span> , as for example <em>kqueue</em> is broken on most <em>BSD</em> systems and will not be auto-detected unless it is requested explicitly. This is the set of backends that <em>libev</em> will probe no backends specified explicitly. </p> </div> <div class="refsect1 parameters" id="refsect1-ev.recommendedbackends-parameters"> <h3 class="title">Parameters</h3> <p class="para">This function has no parameters.</p> </div> <div class="refsect1 returnvalues" id="refsect1-ev.recommendedbackends-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a bit mask which can containing <a href="class.ev.html#ev.constants.watcher-backends" class="link">backend flags</a> combined using bitwise <em class="emphasis">OR</em> operator. </p> </div> <div class="refsect1 examples" id="refsect1-ev.recommendedbackends-examples"> <h3 class="title">Examples</h3> <div class="example" id="example-3624"> <p><strong>Example #1 Embedding one loop into another</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">/*<br />* Try to get an embeddable event loop and embed it into the default event loop.<br />* If it is impossible, use the default<br />* loop. The default loop is stored in $loop_hi, while the embeddable loop is<br />* stored in $loop_lo(which is $loop_hi in the case no embeddable loop can be<br />* used).<br />*<br />* Sample translated to PHP<br />* http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#Examples_CONTENT-9<br />*/<br /></span><span style="color: #0000BB">$loop_hi </span><span style="color: #007700">= </span><span style="color: #0000BB">EvLoop</span><span style="color: #007700">::</span><span style="color: #0000BB">defaultLoop</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$loop_lo </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$embed </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/*<br />* See if there is a chance of getting one that works<br />* (flags' value of 0 means autodetection)<br />*/<br /></span><span style="color: #0000BB">$loop_lo </span><span style="color: #007700">= </span><span style="color: #0000BB">Ev</span><span style="color: #007700">::</span><span style="color: #0000BB">embeddableBackends</span><span style="color: #007700">() & </span><span style="color: #0000BB">Ev</span><span style="color: #007700">::</span><span style="color: #0000BB">recommendedBackends</span><span style="color: #007700">()<br /> ? new </span><span style="color: #0000BB">EvLoop</span><span style="color: #007700">(</span><span style="color: #0000BB">Ev</span><span style="color: #007700">::</span><span style="color: #0000BB">embeddableBackends</span><span style="color: #007700">() & </span><span style="color: #0000BB">Ev</span><span style="color: #007700">::</span><span style="color: #0000BB">recommendedBackends</span><span style="color: #007700">())<br /> : </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /><br />if (</span><span style="color: #0000BB">$loop_lo</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$embed </span><span style="color: #007700">= new </span><span style="color: #0000BB">EvEmbed</span><span style="color: #007700">(</span><span style="color: #0000BB">$loop_lo</span><span style="color: #007700">, function () {});<br />} else {<br /> </span><span style="color: #0000BB">$loop_lo </span><span style="color: #007700">= </span><span style="color: #0000BB">$loop_hi</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </div> <div class="refsect1 seealso" id="refsect1-ev.recommendedbackends-seealso"> <h3 class="title">See Also</h3> <ul class="simplelist"> <li class="member"> <a href="class.evembed.html" class="classname">EvEmbed</a> </li> <li class="member"> <span class="methodname"><a href="ev.embeddablebackends.html" class="methodname" rel="rdfs-seeAlso">Ev::embeddableBackends()</a> - Returns the set of backends that are embeddable in other event loops.</span> </li> <li class="member"> <span class="methodname"><a href="ev.supportedbackends.html" class="methodname" rel="rdfs-seeAlso">Ev::supportedBackends()</a> - Returns the set of backends supported by current libev configuration.</span> </li> <li class="member"> <a href="class.ev.html#ev.constants.watcher-backends" class="link">Backend flags</a> </li> <li class="member"> <a href="ev.examples.html" class="link">Examples</a> </li> </ul> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="ev.nowupdate.html">Ev::nowUpdate</a></div> <div class="next" style="text-align: right; float: right;"><a href="ev.resume.html">Ev::resume</a></div> <div class="up"><a href="class.ev.html">Ev</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>