Hi guys!
I can’t find an example of CriticalSection.
Searching in the forum also didn’t give me a complete picture.
I want to lock updating and removing entries from an array in a multithreading app (no GUI).
Help is appreciated!
This is like a semaphore but there is only one “thing” that the CriticalSection protects and not an array. Adapt the example at http://documentation.xojo.com/index.php/Semaphore .
I think it works.
I’ve added a CriticalSection class property to the thread that does the updating, initialized it in the Run event handler and added Enter & Leave around the ‘critical’ code inside one of its methods.
No errors = Good job?
Good job. Forgot something: you need to ignore IllegalLockingException which can occur when you want to “kill” something. I’m doing this:
#pragma BreakOnExceptions false
try
if theSemaphore <> Nil then theSemaphore.Release
catch err as IllegalLockingException
'just ignore
end try
#pragma BreakOnExceptions True
Cheers!
I don’t think I need that though.