PHP Manual
SyncSemaphore
Decreases the count of the semaphore or waits

SyncSemaphore::lock

(PECL sync >= 1.0.0)

SyncSemaphore::lock — Decreases 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

A boolean of TRUE if the lock operation was successful, FALSE otherwise.

范例

Example #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

SyncSemaphore::unlock() - Increases the count of the semaphore

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