I think it's due to my use of APCs like I said. Try replacing SleepEx(100, TRUE) with WaitForSingleObject(handle, INFINITE). Edit: Never mind. Seems it might n

I think it's due to my use of APCs like I said. Try replacing SleepEx(100, TRUE) with WaitForSingleObject(handle, INFINITE). Edit: Never mind. Seems it might not be the APCs. Maybe some callee of Sleep(Ex) is just rounding up the wait interval to a time slice somewhere. Not sure... would need some digging.