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: /home/kckglobal/www/portal/vendor/amphp/sync/src/

files >> /home/kckglobal/www/portal/vendor/amphp/sync/src/LocalSemaphore.php

 <?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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