CountDownTimer for my perl program,

[venky4289]

Hi I need to add countdown timer to my perl program which starts from 00:25:00(25 minutes)when i start running the script and the program should abort/exit when the timer becomes 00:00:00 . thanks in advance.

[tmharish]

You can try a timeout through eval.

[vinoth.ree]

tmharish ++

Here is the exact code to timeout for 25 minutes.

use strict;
use warnings;
use utf8;

eval {
   local %SIG;
   $SIG{ALRM}=   sub{ die "timeout reached, after 25 minutes!\n"; };
   alarm 25*60; # 25 minutes.
    while(1)
    {
        sleep(1);
        print "Hello Perl\n";
    }
   alarm 0;
};

alarm 0;

if($@) 
{ 
    print "Error: $@\n";
}
exit(0);

[MidLifeXis]

See the warning about using sleep and alarm being used in tandem.

[vinoth.ree]

MidLifeXis ++

Thanks for the valuable info.

[ww]

Since you already have answers to your lazy (homework? job requirement?) question, TIMTOWTDI (but you'll need to adapt, almost trivially, to make this abort some other running program... by, for example, killing the other's PID or similar):

#! /usr/bin/perl
use 5.016;
# 1020073
# Timeout Timer w/o eval or SIG

print "How many minutes? ";
my $min = <>;
chomp $min;
my $time_remaining = ($min * 60);

sub countdown {
  my $t_left = shift;
  while ($t_left > 0) {
    sleep 1;
    --$t_left;
    say "Seconds remaining: $t_left";  #elaborate this sub if you want
+ output in min:sec format
  }
}

say countdown($time_remaining);

print "\a" x 5 . "\t\t $time_remaining countdown is finished\n";

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