SyncSemaphore::lock

(PECL sync >= 1.0.0)

SyncSemaphore::lockDecreases the count of the semaphore or waits

说明

public 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();
?>

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