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<?php namespace Amp\Sync; use Amp\Promise; /** * A non-blocking counting semaphore based on keys. * * 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 KeyedSemaphore { /** * Acquires a lock on the semaphore. * * @param string $key Lock key * * @return Promise<Lock> Resolves with an integer keyed lock object. Identifiers returned by the * locks should be 0-indexed. Releasing an identifier MUST make that same identifier available. 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(string $key): Promise; }
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