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.


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