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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; }
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