php的libev扩展_PHP教程

ev is a PECL extension providing inteface to libev library – high performance full-featured event loop written in C. ABOUT LIBEV Libev is an event loop: you register interest in certain events (such as a file descriptor being readable or a timeout occurring), and it will manage these event sources and provide your program with events. 那么什么是libev呢，从网上摘录一段: libev 是高性能事件循环/事件模型的网络库，并且包含大量新特性。 它是继lievent和Event perl module之后的一套全新网络库。它追求的目标：速度更快，bug更少，特性更多，体积更小。 www.2cto.com 它和libevent很像，按照作者的介绍，可以作为libevent的替代者，能够提供更高的性能。并不需要复杂的配置。 看起来和之前提到的libevent大有渊源，但是这个扩展的作者显然比较活跃，一周内提交了3个版本。 代码示例 timer的使用 stop(); // Stop the watcher if further calls cause more than 10 iterations Ev::iteration() >= 10 and $w->stop(); }); // 创建一个已停止的timer，手工start才有效 $w_stopped = EvTimer::createStopped(10, 5, function($w) { echo "Callback of a timer created as stopped\n"; // Stop the watcher after 2 iterations Ev::iteration() >= 2 and $w->stop(); }); // Loop until Ev::stop() is called or all of watchers stop Ev::run(); // Start and look if it works $w_stopped->start(); echo "Run single iteration\n"; Ev::run(Ev::RUN_ONCE); echo "Restart the second watcher and try to handle the same events, but don't block\n"; $w2->again(); Ev::run(Ev::RUN_NOWAIT); $w = new EvTimer(10, 0, function() {}); echo "Running a blocking loop\n"; Ev::run(); echo "END\n"; ?> 输出内容 2 seconds elapsed is called every second, is launched after 2 seconds iteration = 1 is called every second, is launched after 2 seconds iteration = 2 is called every second, is launched after 2 seconds iteration = 3 is called every second, is launched after 2 seconds iteration = 4 is called every second, is launched after 2 seconds iteration = 5 Run single iteration Callback of a timer created as stopped Restart the second watcher and try to handle the same events, but don't block Running a blocking loop is called every second, is launched after 2 seconds iteration = 8 is called every second, is launched after 2 seconds iteration = 9 is called every second, is launched after 2 seconds iteration = 10 END I/O事件 例1 例2 stop(); // Stop write watcher $w->stop(); $in = "HEAD / HTTP/1.1\r\n"; $in .= "Host: google.co.uk\r\n"; $in .= "Connection: Close\r\n\r\n"; if (!socket_write($socket, $in, strlen($in))) { trigger_error("Failed writing $in to socket", E_USER_ERROR); } $read_watcher = new EvIo($socket, Ev::READ, function ($w, $re) use ($socket, $e_nonblocking) { // Socket is readable. recv() 20 bytes using non-blocking mode $ret = socket_recv($socket, $out, 20, MSG_DONTWAIT); if ($ret) { echo $out; } elseif ($ret === 0) { // All read $w->stop(); socket_close($socket); return; } // Caught EINPROGRESS, EAGAIN, or EWOULDBLOCK if (in_array(socket_last_error(), $e_nonblocking)) { return; } $w->stop(); socket_close($socket); }); Ev::run(); }); $result = socket_connect($socket, $address, $service_port); Ev::run(); ?> 输出 HTTP/1.1 301 Moved Permanently Location: http://www.google.co.uk/ Content-Type: text/html; charset=UTF-8 Date: Sun, 23 Dec 2012 16:08:27 GMT Expires: Tue, 22 Jan 2013 16:08:27 GMT Cache-Control: public, max-age=2592000 Server: gws Content-Length: 221 X-XSS-Protection: 1; mode=block X-Frame-Options: SAMEORIGIN Connection: close

http://www.bkjia.com/PHPjc/477830.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/477830.htmlTechArticleev is a PECL extension providing inteface to libev library high performance full-featured event loop written in C. ABOUT LIBEV Libev is an event loop: you register interest in certa...