alarm does wake the program in sleep, at least on my perl, v5.10.0 built for MSWin32-x86-multi-thread.

Here is the code 

use strict;

sub Call_with_Timeout{
   my ($TIMEOUT, $CODEREF) = @_;

   eval {
      local $SIG{ALRM} = sub { die "alarm time out" };
      alarm $TIMEOUT;
      $CODEREF->(); # Whatever needs to be done
      alarm 0;
      1;  # return value from eval on normalcy
  } or return -1; # Timeout happened
  return 1; # OK
}

 my $t=Call_with_Timeout(3, sub{ sleep 3, print "$_.\n" for 1..2});
   print "Timed out=$t;\n";

[download]
prints
Timed out=-1;
Which means that the alarm woke it up.

     "As you get older three things happen. The first is your memory goes, and I can't remember the other two... " - Sir Norman Wisdom

In reply to Re: Waiting for Alarm by NetWallah
in thread Waiting for Alarm by n8ur

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.