[Python-Dev] test_fork1 on SMP? (was Re: [Python Dev] test_fork1 failing --with-threads (for some people)...)

Neil Schemenauer nascheme@enme.ucalgary.ca
Thu, 27 Jul 2000 07:50:58 -0600

On Thu, Jul 27, 2000 at 01:17:03AM -0400, Tim Peters wrote:
> If there exists a platform on which it fails but it doesn't fail every time
> on that platform, that would be strong evidence of a timing hole.  Those
> usually require <gasp!> thought to identify and repair.  I'll voluteer to
> eyeball the code and do some thinking, but not unless the symptoms suggest
> that's worthwhile.
> ignorantly y'rs  - tim

Here is some code that seems to hang on Linux UP machines.  Sometimes it prints
PIDS for a while and other times it stops after only a few.  I don't know if
that counts.  I raised this issue over a month ago.  Tim, your getting
forgetful. :)


import threading
import os, sys

class MyThread(threading.Thread):
    def start(self):

    def run(self):
        while 1:
            if os.fork() == 0:
                print os.getpid()