[netcdf-hdf] [netcdfgroup] netcdf4 and OpenMP

[Charlie Zender]

> Neither netcdf-3 nor netcdf-4 are known to be threadsafe. But the
> reason you are not seeing this is that you are probably only doing
> reads (and writes?) of data, and not any metadata operations.

Yes. we thread the data and (some) metadata reads. All the writes are
done single-threaded or in "critical regions", i.e., restricted to
one thread at a time. This avoids all the gotchas we know of.
It's the unknown unknowns that we're less sure about :)
Will think more about Ed's record variable example.
Makes my head hurt.

Charlie
-- 
Charlie Zender, Department of Earth System Science, UC Irvine
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