Thread-local storage: a generic internal library (with no allocations) #5720
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The number of CPUs is useful information for creating a thread pool or a number of workers, but it's not really about threading directly. Evict it from the thread file
Clarify the `git_atomic` type and functions now that we have a 64 bit version as well (`git_atomic64`).
This adds a generic TLS interface for anyone to store TLS data. It is designed to work regardless of whether threading support is built into the library or not. Nobody in the library should directly interface with the data on the TLS struct, so it's been built to be opaque even in the library. Requires the allocator to be initialized before use.
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Provide more clarity for Win32 calling conventions - now that we always compile to __cdecl on Win32, we'll define that as the the libgit2 calling convention. Also offer NTAPI (__stdcall) calling conventions for things that need callbacks from NTAPI code (eg fiber-local storage).
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Use a no-allocation approach to the TLS data abstraction.
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This was referenced Dec 9, 2020
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I wanted to merge #5602, but I wanted to see if we could do it without allocation. Indeed we can, so I refactored it a bit to be able to do that.