I’m writing a program which calculates the Mandelbrot Set (and then renders it in OpenGL under Windows) in order to utilise parallel programming techniques.
I’m supposed to demonstrate the use of threads, mutexes, and semaphores; so at the moment I’m calculating the set using multiple threads (splitting the set up horizontally) and timing each thread, then adding it to a total (the total is a global variable protected by a mutex)
I’d like to be able to view the total in debug mode – is there any relatively simple way to do this, other than rendering the total in the OpenGL window, or checking the contents of the variable with break points?
If you’re on windows you could use OutputDebugString and view the results with a tool called DebugView. The downside is that it will print each value on a new line instead of updating it in place (which I guess is what you prefer).
If you want to view a value that will be updated in-place, you could probably use Performance Counters, but it’s much more of a hassle: First, your program would have to implement a provider. And second, you’ll have to write another program (a consumer) to track this counter and display it. But if you want maximum flexibility, this API is great, since it means many programs can observe the provider’s counters, and they can, for example, be logged to a file and replayed or turned into a graph.