terminating a secondary thread from the main thread (cocoa)

Question

I\'m working on a small app written in objective-c with the help of the cocoa framework and I am having a multithreading issue. I would really appreciate it if somebody could he

Answer 1

I think the easiest way is to use NSThread's -(void)cancel method. You'll need a reference to the thread you've created, as well. Your example code would look something like this, if you can do the worker thread as a loop:

- (IBAction)startWorking:(id)sender {
     myThread = [[NSThread alloc] initWithTarget:self selector:@selector(threadMain:) object:nil];
     [myThread start];
}

- (void)threadMain
{
    while(1)
    {
        // do IO here
        if([[NSThread currentThread] isCancelled])
            break;
    }
}

- (IBAction)stop:(id)sender {
   [myThread cancel];
   [myThread release];
   myThread = nil; 
}

Of course, this will only cancel the thread between loop iterations. So, if you're doing some long blocking computation, you'll have to find a way to break it up into pieces so you can check isCancelled periodically.

Answer 2

Also take a look at the NSOperation and NSOperationQueue classes. It's another set of threading classes that make developing a worker thread model very easy to do.