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<?php
namespace Amp\Sync;
use Amp\Promise;
/**
* An asynchronous semaphore based on pthreads' synchronization methods.
*
* This is an implementation of a thread-safe semaphore that has non-blocking
* acquire methods. There is a small tradeoff for asynchronous semaphores; you
* may not acquire a lock immediately when one is available and there may be a
* small delay. However, the small delay will not block the thread.
*
* @deprecated ext-pthreads development has been halted, see https://github.com/krakjoe/pthreads/issues/929
*/
class ThreadedSemaphore implements Semaphore
{
/** @var \Threaded */
private $semaphore;
/**
* Creates a new semaphore with a given number of locks.
*
* @param int $locks The maximum number of locks that can be acquired from the semaphore.
*/
public function __construct(int $locks)
{
if ($locks < 1) {
throw new \Error("The number of locks should be a positive integer");
}
$this->semaphore = new Internal\SemaphoreStorage($locks);
}
/**
* {@inheritdoc}
*/
public function acquire(): Promise
{
return $this->semaphore->acquire();
}
}