filelock.py 文件源码

def acquire(self, blocking=False):
        import msvcrt  # @UnresolvedImport

        flags = os.O_CREAT | os.O_WRONLY
        mode = msvcrt.LK_NBLCK
        if blocking:
            mode = msvcrt.LK_LOCK

        self.fd = os.open(self.filename, flags)
        try:
            msvcrt.locking(self.fd, mode, 1)
            return True
        except IOError:
            e = sys.exc_info()[1]
            if e.errno not in (errno.EAGAIN, errno.EACCES, errno.EDEADLK):
                raise
            os.close(self.fd)
            self.fd = None
            return False