i'm not a real wizard, but i managed to scrape this together. it seems to do the generic task of running pieces of data (isos) through resources (burners) and waiting for a resource to finish before continuing.

hope this helps. 

#!perl -l

use strict;
use warnings;

# make WNOHANG available
use POSIX ":sys_wait_h";

our %jobs;                      # track pid -> resource
our @resource = qw{a b c};      # concurrent resources
my @data = qw{5 4 3 2 1 0};     # data to run through a resource

$SIG{"CHLD"} = sub {
        my $chld;
        $chld = waitpid(-1, WNOHANG) until $chld;
        return unless $chld > 0;
        print "$$ sees $chld is done";
        print "resource " . $jobs{$chld} . " is free again!";
        push @resource, $jobs{$chld};
        delete $jobs{$chld};
        alarm 0;        # send SIGALRM so sleep() wakes up
};

sub runcmd {
        my ($resource, $data) = @_;
        my @cmd = ("sleep", $data);     # define command
        print ">>> $$ runcmd($resource, $data) start";
        system @cmd;                    # run command
        print "<<< $$ runcmd($resource, $data) end";
}

print "main pid: $$";

while (@data) {
        my ($data, $resource, $chld) = shift @data;
        print "sleep ... resource(@resource), data(@data)";
        sleep until @resource;
        print "done sleeping! resource(@resource), data(@data)";
        $resource = shift @resource;
        if (($chld = fork()) > 0) {
                # parent code
                $jobs{$chld} = $resource;
        } else {
                # child code
                runcmd($resource, $data);
                exit;           # end chld, trigger $SIG{CHLD}
        }

}

sleep until keys %jobs == 0;    # wait for all jobs

print "all done!";

[download]

perl -e'$_="nwdd\x7F^n\x7Flm{{llql0}qs\x14";s/./chr(ord$&^30)/ge;print'

In reply to Re: forking and ipc by pizza_milkshake
in thread forking and ipc by hambo

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