Commits on Nov 23, 2021

1. Make API globals thread safe using atomics …

   While the GIL is held when the API pointer is updated, this can still race with
   other threads checking the current value of the API pointer (without holding the
   GIL) and should therefore using atomics.
   
   The loads and stores are performed using acquire-release semantics as we want to
   dereference the pointer and hence any stores to the referenced memory need to be
   visible to us.
   
   The get function should also be unsafe as the offset it uses cannot be verified
   which might create an invalid pointer invoking undefined behaviour as per the
   contract of pointer::offset.
   
   Finally, the initialization code is moved into a separate cold function to
   improve code locality for the fast path.

   

   adamreichold committed Nov 23, 2021
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