- PHP 手册
- 函数参考
- 进程控制扩展
- Libevent
- Libevent 函数
event_add
(PECL libevent >= 0.0.1)
event_add — Add an event to the set of monitored events
说明
event_add ( resource$event
[, int $timeout = -1
] ) : bool
event_add() schedules the execution of the event
when the event specified in event_set() occurs or in at least the time
specified by the timeout argument. If
timeout was not specified, not timeout is set. The
event must be already initalized by event_set()
and event_base_set() functions. If the
event already has a timeout set, it is replaced by
the new one.
参数
-
event -
Valid event resource.
-
timeout -
Optional timeout (in microseconds).
返回值
event_add() returns TRUE on success or FALSE on error.
User Contributed Notes 1 note
up down 3 zhaoyong dot lc at gmail dot com ¶6 years ago
This is a Timer example use pcntl and libevent
function newChild($func_name) {
echo "enter newChild\n";
$args = func_get_args();
unset($args[0]);
$pid = pcntl_fork();
if ($pid == 0) {
function_exists($func_name) and exit(call_user_func_array($func_name, $args)) or exit(-1);
} else if($pid == -1) {
echo "Couldn't create child process";
} else {
return $pid;
}
}
function on_timer() {
echo "timer called\n";
}
/**
* @param $func string, function name
* @param $timeouts int, microtimes for time delay
*/
function timer($func, $timeouts){
echo "enter timer\n";
$base = event_base_new();
$event = event_new();
event_set($event, 0, EV_TIMEOUT, $func);
event_base_set($event, $base);
event_add($event, $timeouts);
event_base_loop($base);
}
$pid = newChild("timer", "on_timer", 5000000);
if ($pid > 0) {
echo "master process exit\n";
}
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官方地址：https://www.php.net/manual/en/function.event-add.php