The SyncSemaphore class

(PECL sync >= 1.0.0)

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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.

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SyncSemaphore {
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public __construct ([ string $name [, int $initialval = 1 [, bool $autounlock = TRUE ]]] )
public lock ([ int $wait = -1 ] ) : bool
public unlock ([ int &$prevcount ] ) : bool
}

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