First, thank you for your detailed response.

As you have noted, this code is extremely impractical. It represents the smallest version of a more complex but impractical code that repeated the issue, which is why I posted it. In addition to being a generic learning exercise, my ultimate goal is the design of a main processing engine with worker threads that respond to pause/resume/kill requests. The more complex version follows:

#!/usr/bin/perl
use strict;
use warnings;
use threads;
use Thread::Queue;
use Thread::Semaphore;

# Create terminal watcher
print "Create terminal watcher...\n";
my $Q_stdin = Thread::Queue->new;
my $T_input = async {
                        $Q_stdin->enqueue( $_ ) while defined( $_ = <S
+TDIN> );
                    }->detach;

# Create tracking arrays
close STDIN;
my $Q_found = Thread::Queue->new;
my %workers = ();
my %sema = ();

my $cmd;
#my $i = 0;
print "Awaiting commands...\n";
MAIN_LOOP: while (not defined $cmd or $cmd !~ /^q/i) {
    # Process commands
    #print ++$i, "\n";
    $cmd = $Q_stdin->dequeue_nb;
    if (defined $cmd) {
        chomp $cmd;
        if ($cmd =~ /^q/i) { # Quit
            print "Resolving open threads\n";
        } elsif ($cmd =~ /^w/i) { # Work
            my (undef, $thread) = split /\s+/, $cmd;
            if ($thread =~ /\D/) {
                print "Noninteger thread $thread in $cmd\n";
            } elsif (defined ($workers{$thread}) and $workers{$thread}
+) {
                print "Value $thread already a worker\n";
            } else {
                $sema{$thread} = Thread::Semaphore->new(1);;
                $workers{$thread} = threads->new(\&worker,
                                                 $thread, $Q_found, $s
+ema{$thread}
                                                 );
            }
        } elsif ($cmd =~ /^p/i) { # Pause
            my (undef, $thread) = split /\s+/, $cmd;
            if (defined ($workers{$thread}) and $workers{$thread}) {
                if (${$sema{$thread}}) {
                    $sema{$thread}->down();
                    $workers{$thread}->kill('STOP');
                    print "Thread $thread paused\n";
                } else {
                    print "Thread $thread already paused\n";
                }
            } else {
                print "Unrecognized thread $thread in $cmd\n";
            }
        } elsif ($cmd =~ /^r/i) { #Resume
            my (undef, $thread) = split /\s+/, $cmd;
            if (defined ($workers{$thread}) and $workers{$thread}) {
                if (${$sema{$thread}}) {
                    print "Thread $thread already running\n";
                } else {
                    $sema{$thread}->up();
                    print "Thread $thread resumed\n";
                }
            } else {
                print "Unrecognized thread $thread in $cmd\n";
            }
        } elsif ($cmd =~ /^s/i) { # Status
            my (undef, $thread) = split /\s+/, $cmd;
            if (defined ($workers{$thread}) and $workers{$thread}) {
                $workers{$thread}->kill('FPE');
            } else {
                print "Unrecognized thread $thread in $cmd\n";
            }
        } elsif ($cmd =~ /^k/i) { # Kill
            my (undef, $thread) = split /\s+/, $cmd;
            if (defined ($workers{$thread})) {
                if ($workers{$thread}) {
                    $workers{$thread}->kill('KILL')->detach;
                    print "Thread $thread killed\n";
                    $workers{$thread} = 0;
                } else {
                    print "Thread $thread already dead\n";
                }
            } else {
                print "Unrecognized thread $thread in $cmd\n";
            }
        } else {
            print "Unknown/misformatted command $cmd\n";
        }
    }

    # Print announcements
    while (defined(my $output = $Q_found->dequeue_nb)) {
        print $output, "\n";
    }
    sleep(1); # Reduce load
}
# We're quitting - kill remaining threads
for my $thread (grep $workers{$_}, keys %workers) {
    $workers{$thread}->kill('KILL')->detach;
}
#---------------------------------------------------------------------
+----------
sub worker {
    my ($thread, $queue, $semafore) = @_;
    my $cooldown = 0;
    
    # Thread signal handlers
    $SIG{KILL} = sub { threads->exit(); };      # Kill
    $SIG{STOP} = sub { $semafore->down(); $semafore->up(); };   # Paus
+e
    $SIG{FPE} = sub { $queue->enqueue("Thread $thread has cooldown $co
+oldown."); };   # Report

    $queue->enqueue("Thread name: $thread");
    my %nodes = ();
    while (1) {
        $queue->enqueue("$thread step $cooldown");
        sleep(5 * int(exp(0.1 * $cooldown++)));
    }
}

[download]
.

It mostly comes down to me being unwilling to relinquish control over the scheduling a user interface. Ultimately, I plan on replacing the CLI with a GUI thread, though this is probably all an abuse of queues. I also note I am abusing the FPE signal, which came down to random selection of a signal on both my Linux and Windows boxes that Windows did not treat as fatal.

In reply to Re^2: threads on Windows by kennethk
in thread threads on Windows by kennethk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.