FWIW: this appears to work at detecting a 'stopped' job.

#!/usr/bin/perl -w
use threads;
use Thread::Semaphore;

$mtx = new Thread::Semaphore(2);

$thr0 = async{ test() };
$thr1 = async{ timer( ) };
print "starting\n";
sleep(1);
$v = $mtx->down();

print "test finished 1st\n" if ( $v == 2 );
print "timer finished 1st\n" if ( $v == 1 );

$thr0->detach();
$thr1->detach();

sub test
{
    print " start(test)\n";
    my $d = $mtx->down();

    sleep( 5 );
    
    $mtx->up( 3 );
    print " exit(test)\n";
}

sub timer
{
    print " start(timer)\n";
    my $d = $mtx->down();
    
    sleep( 10 );
    
    $mtx->up( 2 );
    print " exit(timer)\n";
}

 start(test)
starting
 start(timer)
 exit(test)
test finished 1st
[download]

Unfortunately this also gives me a 'A thread exited while 2 threads were running.' message at the end. I don't know how big of an issue this is.

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