Method acquire

recipes/Python/577524_Python_Sessions/recipe-577524.py:238–259

Acquire the lock, if possible. If the lock is in use, it check again every `wait` seconds. It does this until it either gets the lock or exceeds `timeout` number of seconds, in which case it throws an exception.

(self)

		self.delay = delay

	def acquire(self):
		""" Acquire the lock, if possible. If the lock is in use, it check again
			every `wait` seconds. It does this until it either gets the lock or
			exceeds `timeout` number of seconds, in which case it throws
			an exception.
		"""
		if self.is_locked:
			return

		start_time = time.time()
		while True:
			try:
				self.fd = os.open(self.lockfile, os.O_CREAT|os.O_EXCL|os.O_RDWR)
				break;
			except OSError as e:
				if e.errno != errno.EEXIST:
					raise

				if (time.time() - start_time) >= self.timeout:
					raise FileLockException("Timeout occured.")
				time.sleep(self.delay)
		self.is_locked = True

	def release(self):
		""" Get rid of the lock by deleting the lockfile.