How do I know when all threads are done?

[Christian Heimes]

Zerge schrieb:
> I can launch threads just fine, but then I have to do a time.sleep(n)
> so the main thread from which they where launched will wait for all
> the threads to return.
> 
> How can I detect when all threads are done and then return control to
> the main threads?

import threading

threads = []

threads.append(threading.Thread(...))
threads.append(threading.Thread(...))
threads.append(threading.Thread(...))

for thread in threads:
    thread.start()

# now all threads are running, some might already be done

for thread in threads:
    thread.join()

# here all threads are done

Christian