"OPTION 2" doesn't timeout at all, it waits for external command to complete normally. I think because you used backticks instead of system, Perl didn't die in 3 sec but waited until STDOUT of spawned process was closed. This should work:

use strict;
use warnings;

my $timeout_msg = "Timeout after 3 seconds!\n";
my $t = time;
my $pid;
eval {
    local $SIG{ ALRM } = sub { die $timeout_msg };
    alarm 3;
    $pid = system 1, 'timeout /t 6 > nul && echo Good Morning!';
    waitpid $pid, 0;
    alarm 0
};
if ( $@ ) {
    die $@ unless $@ eq $timeout_msg;
    print $@;
    kill 'KILL', $pid
}
print time - $t, "\n";

[download]

I hope my use of timeout command won't confuse you to insert it somewhere in your code:), it's just to emulate long-running process. More important is Perl Windows system extension.

In reply to Re: inconsistent eval timeout by vr
in thread inconsistent eval timeout by Sanjay

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.