How to make a wrapper around a non-thread safe C library thread-safe

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Dear all,

I am looking for hints how to make the NetCDF.jl prepared for the new threading in Julia 1.3. The package is a wrapper around a C library which is not thread-safe, so I think one has to make sure that only one thread at a time makes a ccall into the linked library and other threads have to wait accordingly. Is it desirable to do the locking on the library-level and if yes, are there examples where this is already implemented?

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You should generally leave that to the user unless you are sure that almost all users would like to use multiple threads and you know exactly how they’ll use it.

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Thanks, so I will just add a warning to the documentation of the package saying it should not be used in a threaded context (or with caution).