(PECL sync >= 1.0.0)
SyncEvent::wait — Waits for the event to be fired/set
waitThe number of milliseconds to wait for the event to be fired. A value of -1 is infinite.
成功时返回 true， 或者在失败时返回 false。
Example #1 SyncEvent::wait() example
<?php
// In a web application:
$event = new SyncEvent("GetAppReport");
$event->fire();
// In a cron job:
$event = new SyncEvent("GetAppReport");
$event->wait();
?>