# The SyncSemaphore class

(PECL sync >= 1.0.0)

## 简介

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.

## 类摘要

class SyncSemaphore {
/* 方法 */
public __construct(string `$name` = ?, int `$initialval` = 1, bool `$autounlock` = `true`)
public lock(int `$wait` = -1): bool
public unlock(int `&$prevcount` = ?): bool
}

## 目录

- 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

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