Store Scope Blocking Expiring Sharing Serialization

:ref:`FlockStore<lock-store-flock>` local yes no yes no

:ref:`MemcachedStore<lock-store-memcached>` remoteno yes no yes

:ref:`MongoDbStore<lock-store-mongodb>` remoteno yes no yes

:ref:`PdoStore<lock-store-pdo>` remoteno yes no yes

:ref:`DoctrineDbalStore<lock-store-dbal>` remoteno yes no yes

:ref:`MemcachedStore<lock-store-memcached>` remoteretry yes no yes

:ref:`MongoDbStore<lock-store-mongodb>` remoteretry yes no yes

:ref:`PdoStore<lock-store-pdo>` remoteretry yes no yes

:ref:`DoctrineDbalStore<lock-store-dbal>` remoteretry yes no yes

:ref:`PostgreSqlStore<lock-store-pgsql>` remote yes no yes no

:ref:`DoctrineDbalPostgreSqlStore<lock-store-dbal-pgsql>` remote yes no yes no

:ref:`RedisStore<lock-store-redis>` remoteno yes yes yes

:ref:`RedisStore<lock-store-redis>` remoteretry yes yes yes

:ref:`SemaphoreStore<lock-store-semaphore>` local yes no no no

:ref:`ZookeeperStore<lock-store-zookeeper>` remoteno no no no

:ref:`ZookeeperStore<lock-store-zookeeper>` remoteretry no no no

When the store does not support blocking locks, the Lock class will retry to acquire

the lock in a non-blocking way until the lock is acquired.

..tip::

Symfony includes two other special stores that are mostly useful for testing: