How to check for threads being finished in python? [CLOSED]

Question

I have a pool of worker threads, created like this:

threads = [MyThread(*args) for i in range(numthreads)]
for t in threads:
 t.start()

I then block until the threads are all done:

while any(t.isAlive() for t in threads):
 pass

Is that the right way to wait for the threads to be done? Should I stick a call to time.sleep() inside the while loop? If so, how long should I sleep? That's probably an unanswerable question, but some guidelines on
choosing the sleep time will be appreciated.

Answer 1

Using the threading module, I assume. Is there any reason you can't simply join() each thread in succession?

Answer 2

I think your while loop busy-waits until the threads are completed. Do this instead:

for t in threads: t.join() # optionally pass a timeout to join

Answer 3

If you are just going to wait for them to finish, and never use them again...

for t in threads:
 t.join()

Doesn't matter which thread ends first, this operation will either block if the thread hasn't finished or cycle to the next thread if it has.