php教程

Watchers

A watcher is an object that gets created to record interest in some event. For instance, the following code waits for STDIN to become readable:

<?php
// Wait until STDIN is readable
$w = new EvIo(STDINEv::READ, function ($watcher$revents) {
 echo 
"STDIN is readable\n";
});
Ev::run(Ev::RUN_ONCE);
?>

All the watcher constructors automatically start the watchers. createStopped methods create stopped watchers(e.g. EvIo::createStopped() )

Note that a watcher will automatically be stopped when the watcher object is destroyed. Therefore, the watcher objects returned by the constructors or factory methods should be kept.

Note also that all methods changing some watcher property( set , priority etc.) automatically stop and start it again if it is active, which means pending events get lost.

See also: Watcher callbacks .

User Contributed Notes

There are no user contributed notes for this page.

CopyRight © 2008-2022 verySource.Com All Rights reserved. 京ICP备17048824号-1 京公网安备:11010502034788