multiprocessing: excepthook not getting called

[Philipp Hagemeister]

multiprocessing just mimicks the threading module here, see
http://bugs.python.org/issue1230540 . Why do you need excepthook in the
first place?

You can perfectly simulate it by wrapping the root method (target in
your example) in a try .. catch:

import multiprocessing
import sys

def printErrors(func):
    def wrapped(*args, **kwargs):
        try:
            func()
        except:
            print ('except: ', sys.exc_info())
    return wrapped

@printErrors
def target():
    raise ValueError()

if __name__ == '__main__':
    p = multiprocessing.Process(target=target)
    p.start()
    p.join()
    # try it here in main
    target()


Cheers,

Philipp


On 06/12/2012 11:02 PM, Dave Cook wrote:
> Why doesn't my excepthook get called in the child process?
>
> import sys
> import multiprocessing as mp
>
> def target():
>     name = mp.current_process().name
>     def exceptHook(*args):
>         print 'exceptHook:', name, args
>     sys.excepthook = exceptHook
>     raise ValueError
>
> if __name__=='__main__':
>     p = mp.Process(target=target)
>     p.start()
>     p.join()
>     # try it here in main
>     target()
>
> Thanks,
> Dave Cook


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