greg wrote: > Jason Zheng wrote: >> Hate to reply to my own thread, but this is the working program that >> can demonstrate what I posted earlier: > > I've figured out what's going on. The Popen class has a > __del__ method which does a non-blocking wait of its own. > So you need to keep the Popen instance for each subprocess > alive until your wait call has cleaned it up. > > The following version seems to work okay. > It still doesn't work on my machine. I took a closer look at the Popen class, and I think the problem is that the __init__ method always calls a method _cleanup, which polls every existing Popen instance. The poll method does a nonblocking wait.
If one of my child process finishes as I create a new Popen instance, then the _cleanup method effectively de-zombifies the child process, so I can no longer expect to see the return of that pid on os.wait() any more. ~Jason -- http://mail.python.org/mailman/listinfo/python-list
