Waits a short amount of time before a second lock acquire attempt.
While this method is subject to have a generic implementation in abstract backend implementation, some backends may provide non blocking or less I/O intensive wait mecanism: this is why this method remains on the backend interface.
string $name: Lock name currently being locked.
int $delay = 30: Miliseconds to wait for.
bool TRUE if the wait operation was successful and lock may be available. You still need to acquire the lock manually and it may fail again.
public function wait($name, $delay = 30);