<?php

namespace Symfony\Component\Lock\Store;

use Symfony\Component\Lock\BlockingStoreInterface;
use Symfony\Component\Lock\Exception\InvalidArgumentException;
use Symfony\Component\Lock\Exception\LockConflictedException;
use Symfony\Component\Lock\Key;

/**
 * SemaphoreStore is a PersistingStoreInterface implementation using Semaphore as store engine.
 *
 * @author Jérémy Derussé <jeremy@derusse.com>
 */
class SemaphoreStore implements BlockingStoreInterface
{
    /**
     * Returns whether or not the store is supported.
     *
     * @internal
     */
    public static function isSupported(): bool
    {
        return \extension_loaded('sysvsem');
    }

    public function __construct()
    {
        if (!static::isSupported()) {
            throw new InvalidArgumentException('Semaphore extension (sysvsem) is required.');
        }
    }

    /**
     * {@inheritdoc}
     */
    public function save(Key $key)
    {
        $this->lock($key, false);
    }

    /**
     * {@inheritdoc}
     */
    public function waitAndSave(Key $key)
    {
        $this->lock($key, true);
    }

    private function lock(Key $key, bool $blocking)
    {
        if ($key->hasState(__CLASS__)) {
            return;
        }

        $keyId = unpack('i', md5($key, true))[1];
        $resource = @sem_get($keyId);
        $acquired = $resource && @sem_acquire($resource, !$blocking);

        while ($blocking && !$acquired) {
            $resource = @sem_get($keyId);
            $acquired = $resource && @sem_acquire($resource);
        }

        if (!$acquired) {
            throw new LockConflictedException();
        }

        $key->setState(__CLASS__, $resource);
        $key->markUnserializable();
    }

    /**
     * {@inheritdoc}
     */
    public function delete(Key $key)
    {
        // The lock is maybe not acquired.
        if (!$key->hasState(__CLASS__)) {
            return;
        }

        $resource = $key->getState(__CLASS__);

        sem_remove($resource);

        $key->removeState(__CLASS__);
    }

    /**
     * {@inheritdoc}
     */
    public function putOffExpiration(Key $key, float $ttl)
    {
        // do nothing, the semaphore locks forever.
    }

    /**
     * {@inheritdoc}
     */
    public function exists(Key $key): bool
    {
        return $key->hasState(__CLASS__);
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NDkyMDg0NDcyMDQxNjM1NSA1NDMxMTAzOTc3ODE4ODAxIDQ2MTQ5OTM5MzE3MzYyMDU=