DontStopThread.py

class SyncClientThread:
	def __init__(self):
		...
		self.stop = False
		self.nostop_depth = 0
	def Stop(self):
		self.stop = True
	
	def IsStopped(self):
		return self.nostop_depth == 0 and self.stop 
	
	def RaiseIfStopped(self):
		if self.stopped:
			raise StopError
	
	@contextlib.contextmanager
	def NoStop(self):
		self.nostop_depth += 1
		try:
			yield
		finally:
			self.nostop_depth -= 1