Issue 31977: threading.Condition can not work with threading.Semaphore (original) (raw)

Issue31977

Created on 2017-11-08 05:12 by 张晓林, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (3)
msg305807 - (view)	Author: 张晓林 (张晓林)	Date: 2017-11-08 05:12
the python document say Condition work will Locks, like RLock... but i find it not work with Semaphore, because Condition._is_owned is like this def _is_owned(self): # Return True if lock is owned by current_thread. # This method is called only if _lock doesn't have _is_owned(). if self._lock.acquire(0): self._lock.release() return False else: return True this work for RLock, but not work for Semaphore, and Semaphore do not have it's own _is_owned implement. i spend a lot of time on this issue. maybe fix it, or document it out?
msg305910 - (view)	Author: Antoine Pitrou (pitrou) *	Date: 2017-11-08 21:29
Why do you want Condition to work with a Semaphore? What would be achieved? A Semaphore is not a lock, it's an other kind of concurrency primitive. I don't think there's any point in detailing it any futrher.
msg305938 - (view)	Author: Raymond Hettinger (rhettinger) *	Date: 2017-11-09 06:11
I concur with Antoine and don't think there is a real issue here to be solved.