Jenner\SimpleFork\Lock\Semaphore::acquire PHP Method

    public function acquire($blocking = true)
    {
        if ($this->locked) {
            throw new \RuntimeException('already lock by yourself');
        }
        if ($blocking === false) {
            if (version_compare(PHP_VERSION, '5.6.0') < 0) {
                throw new \RuntimeException('php version is at least 5.6.0 for param blocking');
            }
            if (!sem_acquire($this->lock_id, true)) {
                return false;
            }
            $this->locked = true;
            return true;
        }
        if (!sem_acquire($this->lock_id)) {
            return false;
        }
        $this->locked = true;
        return true;
    }

 public function acquire($server, $loop)
 {
     $lock = $this->sem->acquire(false);
     if ($lock) {
         return true;
     }
     return false;
 }