how to detect background process completed or not

kamesh3183 has asked for the wisdom of the Perl Monks concerning the following question:

I have following perl code

for (i=0; i<$counter; i++)
{
system("perl test1.pl &");
system("perl test2.pl");

#I want to continue with the next iteration when I am sure that backgr
+ound process is completed
#How can I detect above condition?
}
[download]

How can I detect whether background process is completed or not when using perl system function?

Comment on how to detect background process completed or not Download Code

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Re: how to detect background process completed or not by Tanalis (Curate) on Aug 17, 2005 at 06:59 UTC
Using the CPAN module Proc::Background, you should be able to write something like .. `use Proc::Background; my $proc = Proc::Background->new( $cmd ); $proc->wait; # wait for completion` [download] Maybe a case of cracking a nut with a sledgehammer for this example, but it'd seem nice and clean, and to do what you need. Hope that helps .. -- Foxcub `#include www.liquidfusion.org.uk`	[reply] [d/l]
Re: how to detect background process completed or not by salva (Canon) on Aug 17, 2005 at 07:05 UTC
fork the new process on the perl side, instead of on the shell: `sub system_background { my $pid = fork; if(defined($pid) and $pid==0) { exec(@_); exit(1) } $pid } for (...) { my $child = system_background("perl test1.pl"); system "perl test2.pl"); ... my $result = waitpid($child, 0); }` [download]	[reply] [d/l]