I want to use them, because according to the document, SIGRTs can be queued while multiple signals come. However, the program just exit: 
#!/usr/bin/perl

use common::sense;
use Glib qw/TRUE FALSE/;

$SIG{'SIGRTMIN+5'} = \&on_sig;

my $loop = Glib::MainLoop->new( 'default', FALSE );
$loop->run;

sub on_sig {
    my $sig = shift;
    say "somebody told me $sig";
}

[download]
send him a min+5 
$ ./t_signal.pl &
[2] 3305
$ kill -s SIGRTMIN+5 3305
$ 
[2]+  Real-time signal 5      ./t_signal.pl
$

[download]
Why?

In reply to Unix real time signals by llancet

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