Let's say I have a Tk GUI app that's running a procedure that takes a long time. Let's also say that I've changed my mind and don't want to wait until this procedure ends. I'd like to have a "Stop" button on my GUI that would accomplish this. Is that possible? I already have a button that quits the whole program but I'd like the program to keep running and window still be visible so I can click another button to do something else. Is there any way to stop the current running procedure? It's not multi-threading.
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How to stop a running Tcl procedure
- Thread starter richwd
- Start date
Hi,
Please examine the following, this is just one way of doing it, I am sure there are more sophisticated methods but this is what I can think of as a quick and dirty method:
But, ofcourse, this to work, demands that whatever you do in the while-loop does not occupy the processor for too long with each iteration.
Please examine the following, this is just one way of doing it, I am sure there are more sophisticated methods but this is what I can think of as a quick and dirty method:
Code:
proc proc1 {} {
while {$::exitproc1} {
puts "processing proc1"
after 200
update
}
}
proc proc2 {} {
while {$::exitproc2} {
puts "processing proc2"
after 200
update
}
}
pack [button .b1 -text proc1 -command {set ::exitproc1 1; set ::exitproc2 0; proc1}]
pack [button .b2 -text proc2 -command {set ::exitproc2 1; set ::exitproc1 0; proc2}]But, ofcourse, this to work, demands that whatever you do in the while-loop does not occupy the processor for too long with each iteration.
- Thread starter
- #3
Thanks,
I did something similar with a boolean variable and having the procedure check it like you did but you can't break out of it until you get to a point where you can check the variable right? Instead of doing a "puts" it may be a procedure processing lots of files in a directory and I don't want to wait till it's done to get to the point where you can check the variable. How can you return immediately in the middle of a procedure instead of when it's done? Something like killing a process id. Are there procedure ids? Addresses?
I was wondering if there was something like &address_of_proc.return if you get what I mean. So you can have the function issue a return wherever it's at the current moment. Don't functions (procedures) have addresses?
I did something similar with a boolean variable and having the procedure check it like you did but you can't break out of it until you get to a point where you can check the variable right? Instead of doing a "puts" it may be a procedure processing lots of files in a directory and I don't want to wait till it's done to get to the point where you can check the variable. How can you return immediately in the middle of a procedure instead of when it's done? Something like killing a process id. Are there procedure ids? Addresses?
I was wondering if there was something like &address_of_proc.return if you get what I mean. So you can have the function issue a return wherever it's at the current moment. Don't functions (procedures) have addresses?
What you want is an asynchronious interrupt of a process.
Maybe, using 'trace' could help you out in your quest. You might want to examine this page for more info :
Trial & error I would say...
If you got the time and patience, have also a look in
I am out of ideas, hope it helps!
Maybe, using 'trace' could help you out in your quest. You might want to examine this page for more info :
Trial & error I would say...
If you got the time and patience, have also a look in
I am out of ideas, hope it helps!
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