#!/usr/bin/perl -wall

use strict;

#=-=-=-=-


require Exporter;
package Foo;
our @ISA = qw(Exporter);

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

sub new {
  my $class = shift;
  my $self = {key1 => 'value1',
	      key2 => 'value2'};
  share($self);
  bless($self, $class);
  return $self;
}


#=-=-=-=-


package Bar;
use threads;
use threads::shared;
use Thread::Queue;

my $q = new Thread::Queue;
my $thr = threads->new(\&monitorQueue);


# Add a reference to an empty hash.
my $hash_ref_0 = {};
print "\$hash_ref_0 is a " . ref($hash_ref_0);
&share($hash_ref_0);
$q->enqueue($hash_ref_0);


# Add a reference to a hash with something in it.
my $hash_ref_1 = {keyM => "valueM",
		  keyN => "valueN"};
print "\$hash_ref_1 is a " . ref($hash_ref_1);
&share($hash_ref_1);		# Try sharing the reference.
share(%$hash_ref_1);		# Try sharing the referant.
share($hash_ref_1->{$_}) foreach(keys %$hash_ref_1); # Try sharing all elements of the referant.
$q->enqueue($hash_ref_1);


# Add a blessed reference to a hash with something in it.
my $hash_ref_2 = new Foo();
print "\$hash_ref_2 is a " . ref($hash_ref_2);
&share($hash_ref_2);
$q->enqueue($hash_ref_2);


$thr->join;


sub monitorQueue {
  while (my $elem = $q->dequeue) {
    print "Removed $elem from queue";
    printHashRef($elem);
  }
}


sub printHashRef {
  my $rhash = shift;
  print "Key: '$_'\t\tValue: '$rhash->{$_}'" foreach(sort keys %$rhash);
}