If you want to see how Glib's eventloop works with threads, here is a little demo.

#!/usr/bin/perl
use warnings;
use strict;
use threads;
use threads::shared;
use Glib;
use Glib qw/TRUE FALSE/;
use Term::ReadKey;
$|++;
ReadMode('cbreak');

#use Gtk2 qw/-init -threads-init/;

print "pid-> ",$$,"\n"; 
#Glib::Object->set_threadsafe (TRUE);

#setup shared hash
my %threads;

my $count = 0;

my $main_loop = Glib::MainLoop->new;

Glib::Idle->add(
        sub{
            my $char;
            if (defined ($char = ReadKey(0)) ) {
            #print "$char->", ord($char),"\n";    
        #process key presses here
        if($char eq 'c'){
            $count++;
                print "count $count\n";

            share $threads{$count}{'data'}; 
                share $threads{$count}{'die'}; 
              share $threads{$count}{'thread'};

            $threads{$count}{'data'} = 0; 
                $threads{$count}{'die'} = 0; 
              $threads{$count}{'thread'} = threads->new(\&start_thread
+,$count)->detach;
              }    
        
        if($char eq 'x'){
              #my $kill = shift @actives;
              my $kill = 1;
              
          if(defined $kill){
             $threads{$kill}{'die'} = 1;  
                 print "thread $kill killed\n";
             $threads{$kill}{'thread'} = undef;
          }else{print "no threads running\n";} 
         
         }
          return TRUE; #keep this going 
      }
      });
    

$main_loop->run;
ReadMode('normal'); # restore normal tty settings

sub start_thread {
    
   my $num = shift;
   my $self = threads->self;
   print "Thread ", $self->tid, " started\n";
   print "idenitifier: $num\n"; 


    while(1){
      if( $threads{$num}{'die'} == 1){print "$num dying\n";return}
         else{ 
           print '  ' x $num, $threads{$num}{'data'}++,"\n";  
       select(undef,undef,undef,.5);
    };
    }
}
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