I downloaded your script and ran it under the perl debugger on my linux box. As described the Cancel button did not kill the process.

I set a breakpoint on sub work(), and made a note of $pid, and the pid of the perl process.

  DB<1> b work
  DB<2> c
main::work(test.pl:12):         $pid = open PROC, 
main::work(test.pl:13):     'perl -le"$|=1; print and select(undef,und
+ef,undef,0.1) for 1 .. 1000" |'
main::work(test.pl:14):                 or die $!;
  DB<2> n
  DB<2> x $pid
0  9940
  DB<3> x $$                                    
0  9850

[download]

From there, I ran pstree in a normal bash shell to check the child processes of the perl script:

/tmp$ pstree -apA 9850
perl,9850 -d -I /etc/perl -I /usr/local/lib/perl/5.10.1 -I /usr/local/
+share/perl/5.10.1 -I
  |-sh,9940 -c perl -le"$|=1; print and select(undef,undef,undef,0.1) 
+for 1 .. 1000"
  |   `-perl,9941 -le$|=1; print and select(undef,undef,undef,0.1) for
+ 1 .. 1000
  `-{perl},9939

[download]

What this basically means, is that when you stated the test process, you actually started a shell which started the test process. It was the process ID of that shell that you had stored in $pid. When you sent a kill signal to that PID your killed the shell, but not it's child process.

I think you need to figure out how to start your process without going via a shell. I know you can do it via a fork/exec but that is probably to heavyweight and not portable to windows. There are probably other ways, but I don't know them off the top of my head. I suggest you read perlipc.

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

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