Hi monks,

Having nothing but Perl to wakeup I wrote the folwoing bad code. Zentara told me about the event-loop gap caused by nesting while: 
#!/usr/bin/perl -w
use strict;
system("clear");                
desperta{
#en: wakeup
    my $tempo_inicial = time;
    my $tempo_limite = shift;
    
    while (time<($tempo_inicial+$tempo_limite)){
    print "Enquanto resta ", -(time-($tempo_inicial+$tempo_limite)), "
+ segundos para acordar, porque não dormes?\n";
    #en: 'Why don't you sleep while you have ', time, ' second(s) for 
+that?'
    my $tempo_inicial_interno = time;
    while (time<($tempo_inicial_interno+1)){
        #não faz nada enquanto não transcorrer 1 segundo
        #en: waits 1 second
        };    
    system("clear");                
    };
    while(1){
    $a=1;
    while($a<1500){
        #print $a, "\n";
        print "ACORDA ";
        #en: WAKEUP
        $a++;
    }
    print chr hex 7;
    };
};
1;

[download]

Obviously Zentara is right. This piece of perl consumes almost all the processors clock.

Would you be interested in giving me insightful alternatives for helping me to get the train?

Warming regards!

In reply to Wakeup: event-loop system by fernandes

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