On a more elementary level, why does this code:

use strict;
use warnings;
use 5.010;
use threads;

sub thr_func
{
    say 'in thread';
    $SIG{'HUP'} = sub { say "signal caught" };
}

my $thr = threads->create('thr_func');
$thr->kill('HUP')->join();

[download]
produce this output: 
Signal SIGHUP received, but no signal handler set.

[download]

The threads docs seem pretty clear that you can signal a thread.

In reply to Re: Catching signals under Linux by 7stud
in thread Catching signals under Linux by weismat

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