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Re: [PATCH] Fix rwlock stall with PREFER_WRITER_NONRECURSIVE_NP (bug 23861)


* Andreas Schwab:

>> No, without atomics, the code has a data race and undefined behavior.
>
> In which way?  There is a single setter, and it doesn't matter how long
> the thread takes to see the transition from zero to non-zero.

| The execution of a program contains a data race if it contains two
| conflicting actions in different threads, at least one of which is not
| atomic, and neither happens before the other. Any such data race
| results in undefined behavior.

Florian


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