PHP Manual: Acquire Mutex

Description

final public static boolean Mutex::lock ( long $mutex )

Attempt to lock the Mutex for the caller.

An attempt to lock a Mutex owned (locked) by another Thread will result in blocking.

Parameters

mutex: A handle returned by a previous call to Mutex::create.

Return Values

A boolean indication of success.

Return Values

A newly created and optionally locked Mutex handle

Examples

Example #1 Mutex Locking and Unlocking


<?php
/** You cannot use the "new" keyword, a Mutex is not a PHP object **/
$mutex = Mutex::create();
/** You can now lock the mutex in any context **/
var_dump(Mutex::lock($mutex));
/** It is invalid to attempt to destroy a locked Mutex **/
var_dump(Mutex::unlock($mutex));
/** Always destroy mutex you have created **/
Mutex::destroy($mutex);
?>

The above example will output:

bool(true)
bool(true)