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<?php
namespace Amp\Sync;
use Amp\Promise;
/**
* A non-blocking synchronization primitive that can be used for mutual exclusion across contexts.
*
* Objects that implement this interface should guarantee that all operations are atomic. Implementations do not have to
* guarantee that acquiring a lock is first-come, first serve.
*/
interface Mutex extends Semaphore
{
/**
* Acquires a lock on the mutex.
*
* @return Promise<Lock> Resolves with a lock object with an ID of 0. May fail with a SyncException
* if an error occurs when attempting to obtain the lock (e.g. a shared memory segment closed).
*/
public function acquire(): Promise;
}