Signaling Sleeping Pything

[Marc Poinot]

Hi all dear PythonMarvellousWizardsOfInfiniteLoopWithoutCrashingStack,

I was doing some tiny examples with Python, for a tutorial.
Now, I was using os.signal and my example starts to fail when
I add time.sleep().
The error I have looks like a break in the interpreter analysis,
or something completely different now ?

Well, no hurry, this was a test, but I'd like to understand this ;)

Marcvs [alias I'm sending signal to my processes too, this is the internet
        way of life, sending, sending, sending...]


#!/usr/bin/env python
#
# Uncomment lines with ## to make it fail
#
# this fails on Python 2.0 (#47, Apr 26 2001, 13:36:10) [C] on irix646-64
#
import signal
import os
import random
##import time

number=0
childlist=[]
PMAX=5

def notify():
  global number
  print 'Notify for ', number

for p in range(PMAX):
  number=p
  pid=os.fork()
  if (pid != 0):
    childlist.append(pid)
    print 'Created ',pid
  else:
    signal.signal(signal.SIGUSR1, notify)
    while 1: pass
  
for p in range(20):
  n=random.randrange(0,PMAX)
  print 'Notify ',n
  os.kill(childlist[n],signal.SIGUSR1)

##time.sleep(5)

for n in childlist:
  if not os.kill(n,signal.SIGCONT):
    print 'Child alive:', n

for n in childlist:
    print 'Kill ',n
    os.kill(n,signal.SIGQUIT)
  

# ---