I have been reading a lot about aborting threads and there seems to be something missing to do this easily on program exit. This is what I want to do but I will need some help.
I declared a global boolean called KillAllThreads (public static bool in abstact class).
I initialize it to false in my main program before my main window opens.
I then have some threads open and close. I keep count of opened and closed threads by using another global int called WorkingThreads. I increment WorkingThreasds as the thread starts and decrement is at the end of the thread. This has worked well so far for me.
When I exit the main window I switch the KillAllThreads to true
now comes the question:
How do I make the threads listen to the killAllThreads?
here is my idea in pseudo-code:
thread executes code while killallthreads is false.
as soon as killallthreads is true my code executes the thread abort line and decrements WorkingThreads.
when WorkingThreads == 0 I exit out program.
7  3269  Plater 7,872
Recognized Expert Expert
That could work, just make sure your threads don't sit in any loops with blocking calls.
Instead of doing all this I decided to use:
Application.Exi t();
I know it kills threads in waiting status (aka a window in a thread that displays passive data) quite well but will it kill threads in other states?
Plater 7,872
Recognized Expert Expert
Application.Exi t() is the same call as clicking the X on the main GUI window I believe.
Application.Exi t() is the same call as clicking the X on the main GUI window I believe.
I'm a noob to c# so correct me if I'm wrong:
it isn't quite the same thing: Application.Exi t() is like clicking the X on all currently open forms (even ones open in threads) which leads me to beleive that it frees all resources allocated to the program.
Where is a good resource to see how a certain piece of code frees the memory and deals with threads?
is there some piece of code that will 100% guarantee that all ressources allocated to my app will be freed (this means process killed and threads killed)?
thanks,
-Matt
 TRScheel 638
Recognized Expert Contributor
is there some piece of code that will 100% guarantee that all ressources allocated to my app will be freed (this means process killed and threads killed)?
No, you will need to clean up after yourself.
You should request each thread close before closing your application. While your killallthreads idea is nice, if you have a running list of open threads you could loop through them all and request they close without having each one of them sit in a while loop. In addition, if they are doing something like: -
while (KillAllThreads)
-
{
-
for(i = 0; i > 0; i++);
-
}
-
It wont ever hit that killallthreads. Thats a simplistic view of it, but you can easily replace that line with something that takes a long time like a file download or a lengthy equation and get much the same result. The rest of the program will end but that thread will not.
Calling the abort is a dirty way to get out of a thread too. You really want the thread to run its course and release all its resources (just because its managed code does not mean you cant code memory leaks). Allowing for an alternate path in the code to exit the thread cleanly would be ideal. How to do that depends on what the thread is doing.
I let this problem aside for a while and I resolved it using exceptions.
Indeed, each thread would call a perl script that would do work. sometimes the script would stop because of connection issues. I got all my errors from the perl script and pushed them to c# to raise exceptions
voila: no killing, just catching.
As for when the user exits the app in the middle of work, I just let the thread finish on its own.
thanks,
Matt
I let this problem aside for a while and I resolved it using exceptions.
Indeed, each thread would call a perl script that would do work. sometimes the script would stop because of connection issues. I got all my errors from the perl script and pushed them to c# to raise exceptions
voila: no killing, just catching.
As for when the user exits the app in the middle of work, I just let the thread finish on its own.
thanks,
Matt
If you set the thread IsBackground to true it will be stopped when the application is killed. of course thats not very clean and if the threads are doing something with resources outside the application it will cause trouble.
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