dynamically size thread wake/sleep atomic notifier based on OS#166
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dynamically size thread wake/sleep atomic notifier based on OS#166
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Thanks to @solbjorn for letting me know about this. Per https://github.com/llvm/llvm-project/blob/main/libcxx/src/atomic.cpp, Windows only natively supports waiting on 8-byte variables. Linux only natively supports waiting on 4-byte variables. MacOS can support either.
If the wrong size is selected for the native OS API, the stdlib has to map the syscall through a separate map/table which adds latency.
This PR adds a type alias to select the correct size type.