Due to Perl "safe signals", sleep is an uninteruptable opcode. Try it this way: 

#!/usr/bin/perl -w

use threads;
$SIG{"INT"}=\&sigInt;

my $thread=threads->create('test')->detach();

my $n = 100;
1 while --$n and sleep 1;

sub test { my $n = 100; 1 while --$n and sleep 1; }

sub sigInt { exit; }

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In reply to Re^5: Exiting a script with an 'infinitely looping' thread by BrowserUk
in thread Exiting a script with an 'infinitely looping' thread by markseger

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