Re: [PATCH v4 00/15] Add futex2 syscalls

[Florian Weimer]

* Adhemerval Zanella:

> Also currently we don't have a specific usage.  The proposed patch to
> add the 'pthread_mutex_lock_any' and 'pthreada_timedlock_any' [3] 
> also did not gave much detail in realword usages or how it can be
> leveraged.

The current rwlock implementation in glibc uses a torn 32-bit futex read
which is part of an atomically updated 64-bit word.  That's just really,
really ugly, and I suspect we could make that go away with futex2.

Thanks,
Florian