Execute code after death of all child processes

[Markus Franz]

Hallo!
I have a problem with this little script written in Python:
import sys, os, time
texts = ['this is text1', 'this is text 2']
for current_text in env_sources[0:]:
pid = os.fork()
if pid == 0:
time.sleep(2)
print current_text
break

As you is create some child processes depending on the number of vars
in ?texts?. My problem is: How can I run some code after all child
processes have been finished? (The code should be run only in the
parent process.)

I tried:

import sys, os, time
texts = ['this is text1', 'this is text 2']
for current_text in env_sources[0:]:
pid = os.fork()
if pid == 0:
time.sleep(2)
print current_text
break
os.waitpid(-1, 0)
print 'this is the end'

But this didn't work, 'this is the end' will be showed several times.

Can you help me?

Tanks.
Markus

[Mike Meyer]

mf****@arcor.de (Markus Franz) writes:

Hallo!
I have a problem with this little script written in Python:
import sys, os, time
texts = ['this is text1', 'this is text 2']
for current_text in env_sources[0:]:
pid = os.fork()
if pid == 0:
time.sleep(2)
print current_text
break

As you is create some child processes depending on the number of vars
in ?texts?. My problem is: How can I run some code after all child
processes have been finished? (The code should be run only in the
parent process.)

I tried:

import sys, os, time
texts = ['this is text1', 'this is text 2']
for current_text in env_sources[0:]:
pid = os.fork()
if pid == 0:
time.sleep(2)
print current_text
break
os.waitpid(-1, 0)
print 'this is the end'

But this didn't work, 'this is the end' will be showed several times.

import sys, os, time
texts = ['this is text1', 'this is text2']
for current_text in env_sources[0:]:
pid = os.fork()
if pid == 0:
time.sleep(2)
print current_text
break
if pid != 0:
os.waitpid(-1, 0)
print 'this is the end'

Basically, make sure that none of the children run the waitpid and
last print.

<mike
--
Mike Meyer <mw*@mired.org> http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.

[Terry Reedy]

"Markus Franz" <mf****@arcor.de> wrote in message
news:57**************************@posting.google.c om...

I am a little puzzled about your variable declaration and use:

import sys, os, time
texts = ['this is text1', 'this is text 2']
You don't seem to use 'texts',
for current_text in env_sources[0:]:
or define 'env_sources',
pid = os.fork()
if pid == 0:
time.sleep(2)
print current_text
break

so I don't see how this could run (even with indents inserted back). What
am I missing?

Terry J. Reedy