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

* Andreas Schwab:

> On Dez 11 2018, Florian Weimer <fweimer@redhat.com> wrote:
>
>> * 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,
>
> In which way do the actions conflict?

| Two expression evaluations conflict if one of them modifies a memory
| location and the other one reads or modifies the same memory location.

Thanks,
Florian
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