Hello John,
I’m going to share an undocumented secret with you. :-)
*This works on Windows only*
If you pass the number 1 as the first argument to the system function, then
Perl executes it in a detached mode and lets you continue without waiting for
it to return. This is an example:
########################
use strict;
use warnings;
# This will be an aditional perl process floating around for 60 seconds:
my $command = qq[perl -e "sleep 60"];
# The following call will execute it without waiting for it to return:
system 1, $command;
print "Ok, we're out of here!\n";
########################
If you run that code, you will get to the last print statement immediatly, but
you willl be able to see the perl.exe process running in the task manager for
60 seconds before it ends. You can change what I put in the $command variable
for whatever you are trying to execute.
HTH
Francisco Zarabozo
From: John DePasquale
Sent: Tuesday, August 02, 2016 11:52 AM
To: activeperl@listserv.ActiveState.com
Subject: untethered child process
Hi all,
Is it truly possible to spawn a child process in perl on windows so that the
parent process does NOT wait for the child process to finish before the parent
continues its own processing? I’ve tried to accomplish this over the last
couple of days using exec, system, wind32::process, proc::background, fork, and
more, on windows server 2008 using perl 5.22.1. For each of these statements
I’m able to spawn a child process that runs a .bat file successfully, but in
each case the parent waits for the .bat file to finish processing ( it takes
about 40 seconds ) before the parent proceeds. I’m beginning to think that this
is not really possible on windows. I have found dozens of sites that detail
usage of each of these statements and I’ve tried them all. I can get all of
them to launch and complete a child process but I can’t get the parent to NOT
wait for completion.
Any guidance is very gratefully appreciated. Thank you.
- john
John DePasquale
Chief Executive Officer
Paradigm Consulting
“Proudly presenting the Vinopedia System”
www.vinopedia.us
49 Dalby Street
Newton, MA 02458
Mobile: 617-610-2424
Fax: 617-600-7326
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