Question

I have a test program which would be much simpler if it could rely on threads being scheduled in strict priority order on Windows. I’m seeing a low priority thread running alongside higher priority threads and wonder if this is happening because the different threads are being scheduled on different processor cores.

Is there a way to force all Win32 threads in a process to use a single processor core? SetThreadAffinityMask looks like it might be interesting but its docs aren’t entirely clear and I’m not sure how to use it.

Answer 1

SetThreadAffinityMask function: Sets a processor affinity mask for the specified thread.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms686247%28v=vs.85%29.aspx

SetThreadAffinityMask(GetCurrentThread(), (1 << CoreNumber));

Sets the current thread’s affinity to ‘CoreNumber’ variable