I've only needed alarm once, and this worked: 

eval {
   local $SIG{__DIE__}  = 'DEFAULT';
   local $SIG{ALRM}     = sub { die "timeout" };
   alarm 2700;
   # do things
   alarm 0;
};
if ($@) {
   if ($@ =~ "timeout" ) {
      ...
   } else {
      print "$@\n";
   }
   alarm 0;
}

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In reply to Re: How to set timer in perl by hbm
in thread How to set timer in perl by Rahul Gupta

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