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<?php namespace Amp\Sync; use Amp\Promise; use function Amp\call; class SemaphoreMutex implements Mutex { /** @var Semaphore */ private $semaphore; /** * @param Semaphore $semaphore A semaphore with a single lock. */ public function __construct(Semaphore $semaphore) { $this->semaphore = $semaphore; } /** {@inheritdoc} */ public function acquire(): Promise { return call(function (): \Generator { /** @var \Amp\Sync\Lock $lock */ $lock = yield $this->semaphore->acquire(); if ($lock->getId() !== 0) { $lock->release(); throw new \Error("Cannot use a semaphore with more than a single lock"); } return $lock; }); } }