In fact, for the reasons BrowserUk posted and more (similar caveats exist on almost all OSs), I'd do even less inside the signal handler: 
#!/usr/bin/perl -w
use strict;

my $got_int = 0;
$SIG{INT} = sub { $got_int++ };

while (1){
    print "Signal caught", exit if $got_int;
    print "I am here\n";
}

[download]
Of course you can't always set up quite as minimalistic signal handlers, but don't use them for any more work than absolutely necessary.

Makeshifts last the longest.

In reply to Re^2: signal handler on NT by Aristotle
in thread signal handler on NT by xhe

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