#! perl -slw
use strict;
use threads;
use threads::shared;

my $content : shared = '';

sub concatenate_parallel {
    my $letter = shift;
    sleep 1 + rand 2; ## Do stuff that takes time
    { 
        lock $content; 
        $content .= $letter;
    }
}

print scalar localtime;
my @threads = map{ threads->create( \&concatenate_parallel, $_ ) } 'a' .. 'c';
$_->join for @threads;

print $content;
print scalar localtime;

__END__
c:\test>579015
Wed Oct 18 18:01:20 2006
cab
Wed Oct 18 18:01:22 2006

c:\test>579015
Wed Oct 18 18:01:24 2006
bca
Wed Oct 18 18:01:26 2006

c:\test>579015
Wed Oct 18 18:01:27 2006
abc
Wed Oct 18 18:01:29 2006

c:\test>579015
Wed Oct 18 18:01:30 2006
abc
Wed Oct 18 18:01:32 2006