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