Here is a version that runs just fine on Windows XP ... using threads. 
use strict;
use Tk;
use File::Spec;
use threads;
use Thread::Queue;

my $RequestQ  = Thread::Queue->new;
my $worker    = threads->new(\&worker);

my $top = MainWindow->new();

my $menubar = $top->Menu(-type => 'menubar');
$top->configure(-menu => $menubar);

my $filemenu = $menubar->cascade(-label => '~File', -tearoff => 0);
$filemenu->command(-label => '~Report extract',
                   -command => [\&report_extract],
                   );

$filemenu->command(-label => 'E~xit',
                   -command => [\&Shutdown],
                   );
print STDERR "there's a tiny window open, it's small but it's there\n"
+;



MainLoop();
 print STDERR "Exit Main loop \n";

############################
sub Shutdown{
    $RequestQ->enqueue(undef); # quit the worker
    $worker->join;
    print STDERR "FINISHED Shutdown\n";
    exit; # Clean up Tk
}

############################

sub report_extract {
   my $tmpdir = File::Spec->tmpdir();


   open (F, ">$tmpdir\\xx.csv") || die $!;
   print F "aaa,bbb,ccc\nddd,eee,fff\n";
   close F;
   my $cmd = "start $tmpdir\\xx.csv";
   print STDERR "running $cmd\n";
   $RequestQ->enqueue($cmd);

}
##################
sub worker{
    while (my $target = $RequestQ->dequeue){
      print STDERR "Request $target Read\n";
      system $target;
      print STDERR "Finished target\n";

    }
    print STDERR "Thread exit\n";
}

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Offense, like beauty, is in the eye of the beholder, and a fantasy.
By guaranteeing freedom of expression, the First Amendment also guarantees offense.

In reply to Re: subprocess delay on Windows with Perl/Tk by NetWallah
in thread subprocess delay on Windows with Perl/Tk by kgoess

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