I humbly seek wisdom.

I have a multi-threaded program using Thread::Queue to pass reults to the next thread. Main drops $href = &share({}); onto the first (zeroth?) queue. Each thread takes off the previous queue, produces as many $outSolutionref = &share({}); as necessary and puts them on the next queue.

So far, so good. In fact so good I could stop (but what would be the fun in that?).

Now I'm thinking of writing status out while it's working instead of only when it's done, so I'm using Win32::Console to write out the count of results taken off the input queue and written to the output queue for each thread: 

#/usr/bin/perl -w

use strict;
use threads;
use threads::shared;
use Thread::Queue;
use Win32::Console;

my $CONSOLE = Win32::Console->new(STD_OUTPUT_HANDLE);
my $CURRENT_ROW = 3;
my @consoleInfo = $CONSOLE->Info();
my $statusRow = $consoleInfo[$CURRENT_ROW];

my $numthreads = 4; 

my @DataQueues; #There are n+1 queues (mileposts vs. miles).  
for ($i = 0; $i <= $numthreads  + 1; $i++) {
   $DataQueues[$i] = Thread::Queue->new; 
}

my @aThreads; 
for ($i=0;  $i <= $numthreads; $i++) {
   $aThreads[$i] = threads->new(\&threadprocessor, $DataQueues[$i], $D
+ataQueues[$i+1], $i );
}

#put first (empty) solution on the first queue
my $hrefSolution = &share({});
$DataQueues[0]->enqueue($hrefSolution);
$DataQueues[0]->enqueue(undef);

#wait for threads to exit. 
for ($i=0; $i<=$#aThreads; $i++) {
    $aThreads[$i]->join;
}

#dequeue from the last queue of the chain
my $Solutionref;
my %Solution;
print "\nresults: \n";
while ($Solutionref = $DataQueues[$#DataQueues]->dequeue) {
    %Solution = %{$Solutionref};
    printSolution (\%Solution);
} 
print "\n";


sub printSolution {
    my $href = shift;
    print "\nKEYS: ";
    print(($_).' ') foreach (sort keys %{$href});
    print "\nvals: ";
    print(($$href{$_}).' ') foreach (sort keys %{$href});
    print "\n";
}

sub threadprocessor {
    my ($inqueue, $outqueue, $threadNum) = @_;
    my $inSolnQty = 0; 
    my $outSolnQty = 0;
    my $statString;
    my $threadStatusColumn = $threadNum * 12;
    my $inSolutionref;
    my %inSolution;
    my $outSolutionref;
    my %outSolution;    
    while ($inSolutionref = $inqueue->dequeue) {
        $statString = sprintf ("%5s/%-5s", $inPattQty++, $outPattQty);
        $CONSOLE->WriteChar($statString, $threadStatusColumn, $statusR
+ow);
        %inSolution = %{$inSolutionref};
        While (<>)                    #ok, I'm hiding complexity here
            if (isSolution($_)) {     #ok, I'm hiding complexity here
                $outSolutionref = &share({});
                %$outSolutionref = (%inSolution);
                                      #ok, I'm hiding complexity here
                $outqueue->enqueue($outSolutionref);
                $statString = sprintf ("%5s/%-5s", $inSolnQty, $outSol
+nQty++);
                $threadCONSOLE->WriteChar($statString, $threadStatusCo
+lumn, $statusRow);
            }
        }
    }
    $outqueue->enqueue(undef);
    $statString = sprintf ("%5s/%-5s.", $inSolnQty, $outSolnQty);
    $threadCONSOLE->WriteChar($statString, $threadStatusColumn, $statu
+sRow)
}

[download]

The problem being, after the first queue ends (as indicated by the period) all output stops. Do I need to share the $CONSOLE? or something? What documentation should I have read?

In reply to multi-threaded win32::console by Anonymous Monk

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.