Suggested generator to add to threading module.

Jeff Epler jepler at unpythonic.net
Fri Jan 16 21:02:52 CET 2004


On Fri, Jan 16, 2004 at 08:42:36PM +0100, Ype Kingma wrote:
> > Found myself needing serialised access to a shared generator from
> > multiple threads.  Came up with the following
> > 
> > def serialise(gen):
> >   lock = threading.Lock()
> >   while 1:
> >     lock.acquire()
> >     try:
> >       next = gen.next()
> >     finally:
> >       lock.release()
> >     yield next
> 
> Is there any reason why the lock is not shared among threads?
> >From the looks of this, it doesn't synchronize anything
> between different threads. Am I missing something?

Yes, I think so.  You'd use the same "serialise" generator object in
multiple threads, like this:

p = seralise(producer_generator())
threads = [thread.start_new(worker_thread, (p,))
                for t in range(num_workers)]

Jeff




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