spawnl and waitpid

[naima.mans at gmail.com]

On 27 fév, 19:31, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On 27 Feb 2007 05:39:51 -0800, naima.m... at gmail.com declaimed the
> following in comp.lang.python:
>
>
>
> > On 27 fév, 12:27, Thinker <thin... at branda.to> wrote:
> > > -----BEGIN PGP SIGNED MESSAGE-----
>         <snip>
>
> > > Your program will be blocked here until child process being terminated.
> > > You should print your messages before this line.
>
> > i have tried as you said (cf bellow) and same result...
>
>         No, you did NOT do as was suggested (unless you misunderstood which
> line "before this" meant.
>
> > is there any link which explain how a server Web read script and send
> > the answer ?
>
> > -------------------------------------------------------------------------
> > pid =  os.spawnl(os.P_NOWAIT,"c:\\python25\
> > \python.exe","python","Main.py")
> > ret = os.waitpid(pid,0)
>
>         As soon as you execute os.waitpid(), your script WAITS. NOTHING
> after that point will happen until the process you are waiting on exits.
>
> > print """please wait ...."""
> > sys.stdout.flush()
> >    # retourne le process id
> > if (  ret[1] != 0):
> >     print """ wait %i """ %ret[1]
> >     sys.stdout.flush()
> > else:
> >      print """ end %i """ %ret[1]
> >      sys.stdout.flush()
>
>         pid = os.spawnl(os.P_NOWAIT,
>                                         "c:\\python25\\python.exe",
>                                         "python",
>                                         "Main.py")    #apparently a Windows OS
>         print "Please wait ..."
>         sys.stdout.flush()
>         ret = os.waitpid(pid, 0)
>
>         if ret[1]:
>                 print "Non-zero exit code: %s %s" % (ret[1], ret[0])
>         else:
>                 print "Successful exit"
>         sys.stdout.flush()
>
> {I'm presuming a 0 return code means success... VMS used 1 for success
> and 0 for failure [actually, odd numbers were informational status, even
> numbers were error status]}
>
> > ---------------------------------------------------------------------------
> > thanks
>
> --
>         Wulfraed        Dennis Lee Bieber               KD6MOG
>         wlfr... at ix.netcom.com              wulfr... at bestiaria.com
>                 HTTP://wlfraed.home.netcom.com/
>         (Bestiaria Support Staff:               web-a... at bestiaria.com)
>                 HTTP://www.bestiaria.com/

hello

thanks a lot..

sorry for misunderstanding, my english isn't good (i'm french).

i have tried like this:
----------------------------------------------
#! C:/Python25/python.exe
# -*- coding: cp1252 -*-


import cgitb; cgitb.enable()
import os,sys

print "Content-Type: text/html"
print

pid =  os.spawnl(os.P_NOWAIT,"c:\\python25\
\python.exe","python","Main.py")
print "please wait.."
sys.stdout.flush()
ret = os.waitpid(pid,0)
   # retourne le process id
if ret[1]:
    print "Non-zero exit code: %s %s" % (ret[1], ret[0])
else:
    print "Successful exit"
sys.stdout.flush()
--------------------------------------------------------

and the result:

At the end of the script execution it write:
==>>>>  please wait.. Successful exit

The browser doesn't let the script executing on background to write
the message at once.. it waits the end.


what happend?