public function initialize()
    {
        if ($this->isActive()) {
            throw new RuntimeException('Process is already active');
        }

        $handle = $this->getFileResource();

        if (! @flock($handle, (LOCK_EX | LOCK_NB))) {
            throw new RuntimeException('Could not lock pidfile');
        }

        if (-1 === @fseek($handle, 0)) {
            throw new RuntimeException('Could not seek pidfile cursor');
        }

        if (! @ftruncate($handle, 0)) {
            throw new RuntimeException('Could not truncate pidfile');
        }

        if (! @fwrite($handle, $this->control->info()->getId().PHP_EOL)) {
            throw new RuntimeException('Could not write on pidfile');
        }
    }