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Posix Timer timer is not accurate

I’m working on vxWorks 7. I’ve developed a class to implement POSIX timer. I’m working on a Real Time Process.
The timer is designed to run in single-shot or periodic mode.
The problem is I’m getting random timeout. I’ve attached a list of observed timeout against expected timeut.
Worst problem is that the same code perfectly in Linux (a non-deterministic General Purpose OS) compared to deterministic RTOS.