SyncSemaphore
PHP Manual

SyncSemaphore::lock

Decreases the count of the semaphore or waits

Description

public bool SyncSemaphore::lock ([ integer $wait = -1 ] )

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.

Return Values

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

Examples

Example #1 SyncSemaphore::lock example

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

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

    exit();
}

/* ... */

$semaphore->unlock();
?>

See Also

  • SyncSemaphore::unlock