Hi I am new to threading. So i used Parallel::ForkManager as was suggested that i can use that module for forking of parallel downloads in torrents. My situation was similar to that so i tried it. Can you suggest any changes or modules i can have success. I have also tried the below script.

#!/usr/bin/perl

use strict;
use warnings;
use Tk;
use Tk::Pane;
use WWW::Mechanize;
use Web::Scraper;
use Data::Dumper;
use threads;
my $mw = tkinit();
$mw->geometry('300x300+100+100');
my $sp = $mw->Scrolled('Pane',-scrollbars=>'osoe',sticky=>'nwse')->pac
+k(-expand=>1,-fill=>'both');

$sp->Label(-text=>"Give Keyword file")->pack();
my $entry1 = $sp->Entry()->pack();
my $showbutton = $mw->Button(-text=>'Submit',
-command =>\&button_callback)->pack();
my $bimage = scraper {
  process "img" , "url[]" => '@src';
};
sub button_callback {
my $filename = $entry1->get();
open FH, $filename or die $!;  
while (my $tmpline = <FH>) {
  my $thr1 = threads->new(\&threadsub($tmpline));  
  if(threads->list(threads::running)) {
    print "Waiting for all threads to complete running";
  }
  $thr1->join();                
}
sub threadsub {
  my $line =$_;
  chomp($line); my @temp = split(/ /,$line); my $query = join('+',@tem
+p);
  our $ibing = "http://www.bing.com/images/search?count=10&q=".$query;
  my $mech = WWW::Mechanize->new; 
  $mech->get($ibing);
  #print Dumper $mech->content;
  my $res = $bimage->scrape($mech->content,$mech->uri);
  print Dumper $res;
}

close (FH);
}

MainLoop();
[download]

and here is my error: Use of uninitialized value $line in scalar chomp at btest.pl line 34, <FH> line 1. Use of uninitialized value $line in split at btest.pl line 34, <FH> line 1. $VAR1 = {}; Waiting for all threads to complete runningThread 1 terminated abnormally: Not a CODE reference at btest.pl line 26. Free to wrong pool 333f7f0 not 388020 at C:/strawberry/perl/site/lib/Tk/Widget.p m line 98 during global destruction.