The simple solution:

• read the clock before calling the function, add your desired interval to this value and call it "goaltime"
• call the function, wait for it to return
• read the clock again, compute the time remaining between "now" and "goaltime"
• delay for that amount of time

What to do with "missed" samples is up to you. The obvious choices are to start the next sample immediately and to calculate the next desired sampling time and resume on an interval boundary. Which of these you want depends on what you are doing with the data.

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