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<?php namespace Amp\Sync; use Amp\Promise; use function Amp\call; final class LocalKeyedMutex implements KeyedMutex { /** @var LocalMutex[] */ private $mutex = []; /** @var int[] */ private $locks = []; public function acquire(string $key): Promise { if (!isset($this->mutex[$key])) { $this->mutex[$key] = new LocalMutex; $this->locks[$key] = 0; } return call(function () use ($key) { $this->locks[$key]++; /** @var Lock $lock */ $lock = yield $this->mutex[$key]->acquire(); return new Lock(0, function () use ($lock, $key) { if (--$this->locks[$key] === 0) { unset($this->mutex[$key], $this->locks[$key]); } $lock->release(); }); }); } }