linux sleeping with clock_nanosleep

Question

I want to use clock_nanosleep for waiting of 1 microsec.. As far as I understand, I have to give an absolute time as input. Is the following code okay in this case?

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Answer 1

I recommend 2nd way of use sleep function. because , most of system function uses CLOCK_REALTIME, But, It has some serious problem, If system time and date has changed. In most case I recommend relative sleep way , best choice is using clock_monotonic.