#!/usr/bin/perl -w

use strict;

use threads;
use threads::shared;
use Thread::Queue;

my $q = new Thread::Queue;      # create empty threaded queue
my $threadcount = 10;           # amount of threads
my @SNMPthreads;                # thread tracker

my @firmware : shared;

open (FH, 'filename.txt');

while (<FH>) {
    chomp;
    $q->enqueue($_);
}
close FH;

foreach my $i (1..$threadcount) {
    push @SNMPthreads, threads->new(\&SNMPthread, $i );
}

foreach my $i (0..$#SNMPthreads) {
    my $retval = $SNMPthreads[$i]->join();
}

open (WH, ">firmware.txt");
print WH "-->$_\n" foreach @firmware;
close WH;

sub SNMPthread  {
    my $thread = shift;
    while ( $q->pending && $q->pending > 0) {
        my $left = $q->pending;
        my $ip = $q->dequeue;
        push @firmware, "$$: $thread, $left, $ip";
        my $retval = `/usr/bin/snmpget -v1 -c <commstring> $ip sysDescr.0`;
        chomp $retval;
        $retval =~ s/\>\>//g;
        my @ele = split(/\;/, $retval);
        print "$ip, $ele[ ($#ele-1) ], $ele[ $#ele ]\n";
    }
    print "thread $thread finished\n";

}