I've always just given up on having something run exactly on interval. I think you'll have to write a C program, and pay very careful attention to not exceeding the portion of the 1-second interval with your own code. You'll probably have to use threading or multiple, inter-communicating processes to get this to work. Take care to avoid thread-starting or process-starting time overhead.

One reference that seems relevant dates to 1993: A Randomized Sampling Clock for CPU Utilization Estimation and Code Profiling You'll want to take a look at the appendix "Adversary Source Code" to see how they accurately measured time intervals, and "woke up" their program at just the correct time. Since the code is 19 years old, it probably won't port directly or easily, but if you read it and try to understand it, the principles involved might guide your code.

I've always just given up on having something run exactly on interval. I think you'll have to write a C program, and pay very careful attention to not exceeding the portion of the 1-second interval with your own code. You'll probably have to use threading or multiple, inter-communicating processes to get this to work. Take care to avoid thread-starting or process-starting time overhead.

One reference that seems relevant dates to 1993: A Randomized Sampling Clock for CPU Utilization Estimation and Code Profiling You'll want to take a look at the appendix "Adversary Source Code" to see how they accurately measured time intervals, and "woke up" their program at just the correct time. Since the code is 19 years old, it probably won't port directly or easily, but if you read it and try to understand it, the principles involved might guide your code.

EDIT: Found another reference that might help: Effects of Clock Resolution on the Scheduling of Interactive and Soft Real-Time Processes That should help you with any theoretical background.