Here is my question Oh Monks! I'm trying to launch a tk dialog box to tell the user to wait until what i'm processing is done. To do this i'm forking the main program. The child process creates a main window that shows a please wait message. Once the parent process finishes what it does it tries to kill the child. What happens then is that although the program does not exit, i get this error message:

XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0.0" after 570 requests (559 known processed) with 0 events remaining.

and also it won't fire another tk main window. In the code below the call to resultsTk is ignored.

Here is my code: 

my $pid = fork();
if(!defined($pid)){
    print "Couldn't fork , continue";
}
elsif($pid == 0){
    &waitTk();
}
else{
    print $pid."\n";
    my $min=$max;
    my $count=0;
    my $bpSum=0;
    foreach my $accID (keys %accDict){
        
        #here do things

                sleep(20);
    }
    kill(1,$pid);
    waitpid($pid,0); #don't know if it's needed.Here just in case
    print "it got killed";

    print $min."\n";
    print $max."\n";
    &resultsTk($min,$max);
}
    
sub resultsTk{
    my ($rMin,$rMax) = @_;
    my $main = MainWindow->new();
    $main->withdraw;
    my $dialog = $main->DialogBox(-buttons=>["Ok"]);
    $dialog->add("Label",-text=>"Min: $rMin, Max: $rMax")->pack();
    my $button=$dialog->Show();
    if($button eq "Ok"){
        exit(0);
    }

    
}    
sub waitTk{
    local $SIG{HUP} =sub{exit(0);};
    my $main = MainWindow->new();
    $main->withdraw;
    my $dialog = $main->DialogBox();
    $dialog->add("Label",-text=>"Please wait, calculating.")->pack();
    my $button=$dialog->Show();
}




Result:

_TK_EXIT_(0)
it got killed379
5168
XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server
+ ":0.0"
      after 570 requests (559 known processed) with 0 events remaining
+.

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In reply to killing a child process which contains a Tk Main window by vchristaras

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