Thank you very much. The hint with the shell helps me a lot.

Here a solution which is working for Linux and Windows:

#!perl -slw
use strict;
use threads;
use threads::shared;
use Thread::Queue;

## A shared var to communicate progess between work thread and TK
my $Q = new Thread::Queue;
my $pid:shared;

sub work{

    if( $^O eq "linux" )
    {
        $pid = open PROC,
        "-|",
        "perl",
        "-le",
        '$|=1; print and select(undef,undef,undef,0.1) for 1 .. 1000'
            or die $!;
    }
    elsif( $^O eq "MSWin32" )
    {
        $pid = open PROC,
    'perl -le"$|=1; print and select(undef,undef,undef,0.1) for 1 .. 1
+000" |'
        or die $!;
    }
    else
    {
        die "Not implemented for $^O";
    }

    if( $pid ) {
        while( <PROC> ) {
            $Q->enqueue( $_ );
        }
        close PROC;
    }
}

threads->new( \&work )->detach;

## For lowest memory consumption require (not use)
## Tk::* after you've started the work thread.
use Tk;
use Tk::ProgressBar;

my $mw = MainWindow->new;
my $pb = $mw->ProgressBar()->pack();

my $repeat;
$repeat = $mw->repeat( 100 => sub {
    while( $Q->pending ) {
        my $progress = $Q->dequeue;
        return unless $progress;
        $repeat->cancel if $progress == 100;
        $pb->value( $progress )
    }
} );

$mw->Button('-text' => 'Cancel',
            '-command' => sub{ kill 9, $pid })->pack();

$mw->MainLoop;

[download]

In perlipc I read that if you give an open to minus more than 3 arguments, than the shell is not called.

This solution is ok for me. But of course I'd prefer how to find out the pid of the process I want to kill. Independent whether it is called by a shell or not.

And the other interesting question is why linux is using a shell and windows not?

Greetings,

Dirk

In reply to Re^2: Tk and IPC - killing of process not working in Linux by Dirk80
in thread Tk and IPC - killing of process not working in Linux by Dirk80

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