[PATCH] Improve performance of libc locks

[Wilco Dijkstra]

Hi Cristian,

>> Improve performance of libc locks by adding a fast path for the
>> single-threaded case.
>>
>> On Neoverse V1, a loop using rand() improved 3.6 times. Multithreaded
>> performance is unchanged.
>>
>> Passes regress on AArch64, OK for commit?
>
> Ping ? I saw the stdio one was committed but what happened with this one ?

It is waiting on the locking benchmark being accepted. I've pinged that
(https://sourceware.org/pipermail/libc-alpha/2022-December/143944.html)
since it would be great to get all this in the next GLIBC.

Cheers,
Wilco