I wrote sample code of thread control using signaling as advised by monks. As below, but the thread didn't exit when Ctrl+c pressed: 
#/usr/bin/perl -w
use strict;
use warnings;
use threads;
use threads::shared;

my @thrList;
my $count=1;
share $count;

$SIG{INT} = \&catch_CtrlC;
&main;

sub main
{
    my $counter = 3;
    while($counter)
    {
        $counter--;
        my $thrHandle = threads->create(\&thrdfun);
        push @thrList, $thrHandle;    
    }
    print " waiting \n";
    foreach(@thrList){
        $_->join(); 
    }
}    

sub thrdfun 
{
    $SIG{INT} = \&trExit;
    print "thrdfun: $count \n";
    $count++;
    while(1){
    }
    exit;
}

sub trExit
{ 
    print " exit \n";
    threads->exit(); 
}

sub catch_CtrlC 
{
    print " catch_CtrlC \n";
    foreach(@thrList){
        $_->kill("INT"); 
    }
    exit;
}

[download]
In my plan, catch_CtrlC will first receive the signal and forward it to all thread one by one. For every thread, the trExit will do sth. and exit. I guess I'm using in a wrong way, righ?

In reply to about THREAD SIGNALLING by anaconda_wly

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