Updated: Threads require a signal handler when requested to terminate.

The threads module along with MCE::Shared is another possibility. Like before using MCE::Hobo, shared data constructed with MCE::Shared resides under the shared-manager. MCE::Shared spawns a thread versus a child process when threads is present.

example_t1.pl

#!/usr/bin/env perl

use strict;
use warnings;

use stfl;
use threads;
use MCE::Shared;
use Time::HiRes qw/sleep/;

my $count1 = MCE::Shared->scalar(10000);
my $count2 = MCE::Shared->scalar(20000);
my $count3 = MCE::Shared->scalar(30000);

my $layout; {
    open my $fh, "<", "example.stfl"
        or die "open error 'example.stfl': $!";

    local $/; $layout = <$fh>;
}

my $f = stfl::create($layout);
my $s = 0;

sub bg_start {
    unless ($s) {
        async {
            local $SIG{'QUIT'} = sub { threads->exit() };
            sleep(0.9), $count1->incr() while 1;
        };
        async {
            local $SIG{'QUIT'} = sub { threads->exit() };
            sleep(0.6), $count2->incr() while 1;
        };
        async {
            local $SIG{'QUIT'} = sub { threads->exit() };
            sleep(0.3), $count3->incr() while 1;
        };
        $s = 1;
    }
}

sub bg_stop {
    if ($s) {
        # Signal the thread to terminate, and then detach
        # it so that it will get cleaned up automatically.
        $_->kill('QUIT')->detach() for threads->list();
        $s = 0;
    }
}

$f->set('helpmsg', '[ ESC = exit | F1 = start | F2 = stop ]');

bg_start();

while (1) {
    my $event = $f->run(50);

    if ($s) {
        # must stringify in case numeric value
        $f->set('text 1', ''.$count1->get());
        $f->set('text 2', ''.$count2->get());
        $f->set('text 3', ''.$count3->get());
    }

    next unless (defined $event);

    bg_start() if $event eq 'F1';
    bg_stop()  if $event eq 'F2';

    last       if $event eq 'ESC';
}

bg_stop();
[download]

example_t2.pl

#!/usr/bin/env perl

use strict;
use warnings;

use stfl;
use threads;
use MCE::Shared;
use Time::HiRes qw/sleep/;

my $q = MCE::Shared->queue();

# Start the shared-manager manually.
# https://metacpan.org/pod/MCE::Shared::Queue#LIMITATIONS

MCE::Shared->start() unless $INC{'IO::FDPass.pm'};

my $layout; {
    open my $fh, "<", "example.stfl"
        or die "open error 'example.stfl': $!";

    local $/; $layout = <$fh>;
}

my $f = stfl::create($layout);
my $s = 0;

async {
    my $c = 10000;
    sleep(0.9), $q->enqueue([ 'text 1', ++$c ]) while 1;
};
async {
    my $c = 20000;
    sleep(0.6), $q->enqueue([ 'text 2', ++$c ]) while 1;
};
async {
    my $c = 30000;
    sleep(0.3), $q->enqueue([ 'text 3', ++$c ]) while 1;
};

$f->set('helpmsg', '[ ESC = exit ]');

while (1) {
    my $event = $f->run(50);

    foreach my $ret ($q->dequeue_nb(3)) {
        # must stringify in case numeric value
        $f->set($ret->[0], ''.$ret->[1]);
    }

    next unless (defined $event);
    last if $event eq "ESC";
}

$_->exit()->join() for threads->list();
[download]

Regards, Mario

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