SyncSemaphore::lock

(PECL sync >= 1.0.0)

SyncSemaphore::lock — Decreases the count of the semaphore or waits

说明

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

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