[Proj] Multithread support in PROJ 4.8.0

[José Luis García Pallero]

Hello:

I've seen that in version 4.8.0 has added to proj the thread safe
capability via the Ctx structs. But, is documented the usage of this
new feature? Exists any examples with OpenMP? Where?

Thanks

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José Luis García Pallero
jgpallero at gmail.com
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