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<?php
namespace Amp\Sync;
use Amp\CallableMaker;
use Amp\Deferred;
use Amp\Promise;
use Amp\Success;
class LocalSemaphore implements Semaphore
{
use CallableMaker; // kept for BC only
/** @var int[] */
private $locks;
/** @var Deferred[] */
private $queue = [];
public function __construct(int $maxLocks)
{
if ($maxLocks < 1) {
throw new \Error('The number of locks must be greater than 0');
}
$this->locks = \range(0, $maxLocks - 1);
}
/** {@inheritdoc} */
public function acquire(): Promise
{
if (!empty($this->locks)) {
return new Success(new Lock(\array_shift($this->locks), \Closure::fromCallable([$this, 'release'])));
}
$this->queue[] = $deferred = new Deferred;
return $deferred->promise();
}
private function release(Lock $lock): void
{
$id = $lock->getId();
if (!empty($this->queue)) {
$deferred = \array_shift($this->queue);
$deferred->resolve(new Lock($id, \Closure::fromCallable([$this, 'release'])));
return;
}
$this->locks[] = $id;
}
}
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