lock.py 文件源码

def _lock_success(self, fd):
        """Did we successfully grab the lock?

        Because this class deletes the locked file when the lock is
        released, it is possible another process removed and recreated
        the file between us opening the file and acquiring the lock.

        :param int fd: file descriptor of the opened file to lock

        :returns: True if the lock was successfully acquired
        :rtype: bool

        """
        try:
            stat1 = os.stat(self._path)
        except OSError as err:
            if err.errno == errno.ENOENT:
                return False
            raise

        stat2 = os.fstat(fd)
        # If our locked file descriptor and the file on disk refer to
        # the same device and inode, they're the same file.
        return stat1.st_dev == stat2.st_dev and stat1.st_ino == stat2.st_ino