helpers.py 文件源码

def __enter__(self):
        """Enter RunSingleInstance class
        :return: self
        """
        self.__checked = True

        try:
            self.__filelock = open(self.__lockfile, 'w+')
            # None blocking lock
            fcntl.lockf(self.__filelock, fcntl.LOCK_EX | fcntl.LOCK_NB)
        except IOError:
            if self.__filelock is not None:
                self.__is_running = True
        return self