SyncSemaphore::lock

(PECL sync >= 1.0.0)

SyncSemaphore::lock — Decreases the count of the semaphore or waits

说明

public function SyncSemaphore::lock(int $wait = -1): bool

Decreases the count of a SyncSemaphore object or waits until the semaphore becomes non-zero.

参数

wait
The number of milliseconds to wait for the semaphore. A value of -1 is infinite.

返回值

成功时返回 true， 或者在失败时返回 false。

示例

示例 #1 SyncSemaphore::lock() example

<?php
$semaphore = new SyncSemaphore("LimitedResource_2clients", 2);

if (!$semaphore->lock(3000))
{
    echo "Unable to lock semaphore.";

    exit();
}

/* ... */

$semaphore->unlock();
?>

参见