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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;
}