public function lock()
	{
		$lock_file = $this->getLockFile();

		if (file_exists($lock_file)) {
			// Is running?
			$this->pid = file_get_contents($lock_file);
			if ($this->isrunning()) {
				error_log("==".$this->pid."== Already in progress...");
				return false;
			} else
				error_log("==".$this->pid."== Previous job died abruptly...");
		}

		$this->pid = getmypid();
		$s = file_put_contents($lock_file, $this->pid);
		error_log("==".$this->pid."== Lock acquired, processing the job...");
		return $this->pid;
	}