On 05Feb2020 15:48, Israel Brewster wrote:
In a number of places I have constructs where I launch several
processes using the multiprocessing library, then loop through said
processes calling join() on each one to wait until they are all
complete. In general, this works well, with the *apparent* exception of
if something causes one of the child processes to crash (not throw an
exception, actually crash). In that event, it appears that the call to
join() hangs indefinitely. How can I best handle this? Should I put a
timeout on the join, and put it in a loop, such that every 5 seconds or
so it breaks, checks to see if the process is still actually running,
and if so goes back and calls join again? Or is there a better option
to say “wait until this process is done, however long that may be,
unless it crashes”?
What's your platform/OS? And what does "crash" mean, precisely?
If a subprocess exits, join() should terminate.
If the subprocess _hangs_, then join will not see it exit, because it
hasn't. And join will hang.
You'll need to define what happens when your subprocesses crash.
Cheers,
Cameron Simpson
--
https://mail.python.org/mailman/listinfo/python-list
