SyncSemaphore::lock

(PECL sync >= 1.0.0)

Decreases the count of the semaphore or waits

public bool SyncSemaphore::lock ([ integer $wait ] )

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

Parameters:

wait

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

Returns:

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

Examples:

SyncSemaphore::lock() example

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

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

    exit();
}

/* ... */

$semaphore->unlock();
?>