Re: [PATCH 0/1] MR9194: ntdll: Use ReadPointerAcquire to get pointer value in RtlRunOnceComplete.

[Luca Bacci (＠lb90)]

Thanks a lot!

Out of curiosity, maybe this could be a `ReadPointerNoFence`? There are three cases:

1. `STATUS_INVALID_PARAMETER` is returned: this is a programmer error, and no pointer is returned.
2. `InterlockedCompareExchangePointer` is called, which inserts a full memory fence.
3. `STATUS_UNSUCCESSFUL` is returned: the caller should retrieve the value that "won" by calling `RtlRunOnceBeginInitialize` with `RTL_RUN_ONCE_CHECK_ONLY`, which uses acquire semantics.

That said, it's _safer_ to ensure acquire semantics in a central place and not in each code branch. So probably this is best for long-term code maintenance?