17     def __init__(self, timeout=7200, delay=3):  argument
21         self.is_locked = False
22         self.timeout = timeout
23         self.delay = delay
25     def _setLockFileName(self, file_name):  argument
26         self.lockfile = file_name
28     def acquire(self):  argument
35         if os.path.isfile(self.lockfile):
37                 mark_file_mtime = os.path.getmtime(self.lockfile)
38                 if (start_time - mark_file_mtime > self.timeout):
39                     os.remove(self.lockfile)
46                 self.fd = os.open(self.lockfile, os.O_CREAT|os.O_EXCL|os.O_RDWR)
51                 if (time.time() - start_time) >= self.timeout:
53                 time.sleep(self.delay)
54         self.is_locked = True
57     def release(self):  argument
63         if self.is_locked :
64             os.close(self.fd)
65             os.unlink(self.lockfile)
66             self.is_locked = False
68     def lockFile(self, file_name):  argument
72         self._setLockFileName(file_name)
73         if not self.is_locked:
74             self.acquire()
75         return self
77     def releaseFile(self):  argument
81         if self.is_locked:
82             self.release()
84     def __del__(self):  argument
88         self.release()