Experimental Physics and
Industrial Control System

Interesting ... so at a future point we could certainly consider using a larger integer type.

I am probably leaning towards    1e9 * ((double)val.QuadPart / (double)freq.QuadPart)    compared to    val.QuadPart * (1e9 / (double)freq.QuadPart)   but I don't think it make much difference in practice. 

I also think it would we worth subtracting the ioc boot time  "val.QuadPart" value from the counter, so the result becomes effectively nanoseconds since ioc startup, which makes the values smaller and hence time differences less likely to accumulate small errors.    
-- 
https://code.launchpad.net/~freddie-akeroyd/epics-base/+git/epics-base/+merge/391018
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[Merge] ~freddie-akeroyd/epics-base:fix_win32_monotonic_time into epics-base:7.0 Freddie Akeroyd via Core-talk

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