Re: Question on threads

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  • Steve Holden

    Re: Question on threads

    Jonathan Shao wrote:
    Hi all,
    >
    I'm a beginner to Python, so please bear with me.
    >
    Is there a way of guarenteeing that all created threads in a program are
    finished before the main program exits? I know that using join() can
    guarentee this, but from the test scripts I've run, it seems like join()
    also forces each individual thread to terminate first before the next
    thread can finish. So if I create like 20 threads in a for loop, and I
    join() each created thread, then join() will in effect cause the threads
    to be executed in serial rather than in parallel.
    >
    No it won't, as in fact there is no mechanism to force a thread to
    terminate in Python. When you join() each created thread the main thread
    will wait for each thread to finish. Supposing the longest-lived thread
    finished first then all others will immediately return from join().

    The only requirement it is imposing is that all sub-threads must be
    finished before the main thread terminates.

    regards
    Steve
    --
    Steve Holden +1 571 484 6266 +1 800 494 3119
    Holden Web LLC http://www.holdenweb.com/

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