The SyncSemaphore class
(PECL sync >= 1.0.0)
A cross-platform, native implementation of named and unnamed semaphore objects.
A semaphore restricts access to a limited resource to a limited number of instances. Semaphores differ from mutexes in that they can allow more than one instance to access a resource at one time while a mutex only allows one instance at a time.
/* 方法 */
public __construct ([ string
$initialval= 1 [, bool
public lock ([ int
$wait= -1 ] ) : bool
public unlock ([ int}
&$prevcount] ) : bool
Table of Contents
- SyncSemaphore::__construct — Constructs a new SyncSemaphore object
- SyncSemaphore::lock — Decreases the count of the semaphore or waits
- SyncSemaphore::unlock — Increases the count of the semaphore