#!/usr/bin/perl
# https://perlmonks.org/?node_id=11104382
use strict;
use warnings;
use IO::Select;
use Time::HiRes qw(time);
use List::Util qw( max );
sub Engine::doHeatbeat
{
print "in Engine::doHeatbeat\n";
}
sub Engine::Parser::Command
{
print "in Engine::Parser::Command( @_ )\n";
}
my $interval = 10; # seconds
my $sel = IO::Select->new(*STDIN);
my $trigger = time + $interval; # unix time to call heartbeat
while(1)
{
my $wait = max 0, $trigger - time;
for my $fh ( $sel->can_read( $wait ) )
{
chomp( my $input = <$fh> );
Engine::Parser::Command($input);
}
if( $trigger <= time )
{
Engine::doHeatbeat;
$trigger = time + $interval;
}
}
Consider this an example of why you should use an Async package as recommended by Hippo here Re: Infinite LOOP and reading from STDIN
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