Commits on Oct 23, 2019

1. Fix #271: Correct interval time computations …

   In VxWorks, the sigwait routine was not handling the actual time of
   the first interval, which basically meant that the start_time was
   elapsed twice before the first callback was generated.
   
   This exposed a few other small but significant details regarding
   how the intervals were dealt with across all operating systems.
   
   For VxWorks and RTEMS, where the timer interval is rounded up to
   an integer number of ticks, compute the actual interval time and
   write a debug message in case it is different than the intended
   value.  This makes it more obvious to the user that some
   application/bsp changes might be necessary to get accurate timing.
   
   For all operating systems, the "reset" flag needs to be sampled
   AFTER the sigwait returns, not before it.  This flag gets set when
   the OS_TimeBaseSet() API is called.
   
   Removes an unused POSIX delay routine that was intended to support
   use of clock_nanosleep() in place of the timer signal.  This mode
   was never usable because OS_TimerCreate always allocates a signal and
   fails if it cannot do so.  This code caused problems/incompatibilities
   for the sigwait model which IS used, so it needed to be removed.

   

   jphickey committed Oct 23, 2019
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