The SyncSemaphore class

Introduction

(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.

Class synopsis

public __construct ([ string $name [, int $initialval = 1 [, bool $autounlock = true ]]] )

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