/**
* Acquires an exclusive lock for this shared memory.
*
* If the lock is already acquired then only increment counter of lockings.
*/
private function lock()
{
if ($this->numberLocks === 0) {
$this->semaphore->acquire();
}
$this->numberLocks++;
}
/**
* Lock shared memory
*
* @return boolean True if locked, otherwise false
*/
public function lock()
{
return $this->mutex->acquire();
}
