This may be a silly question but is possible for os.wait() to lose track
of child processes? I'm running Python 2.4.4 on Linux kernel 2.6.20
(i686), gcc4.1.1, and glibc-2.5.
Here's what happened in my situation. I first created a few child
processes with Popen, then in a while(True) loop wait on any of the
child process to exit, then restart a child process:
import os
from subprocess import Popen
pids = {}
for i in xrange(3):
p = Popen('sleep 1', shell=True, cwd='/home/user',
stdout=file(os.devnull,'w'))
pids[p.pid] = i
while (True):
pid = os.wait()
i = pids[pid]
del pids[pid]
print "Child Process %d terminated, restarting" % i
if (someCondition):
break
p = Popen('sleep 1', shell=True, cwd='/home/user',
stdout=file(os.devnull,'w'))
pids[p.pid] = i
As I started to run this program, soon I discovered that some of the
processes stopped showing up, and eventually os.wait() will give an
error saying that there's no more child process to wait on. Can anyone
tell me what I did wrong?
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