__lll_mutex_unlock broken on IA64 with nptl?

[Ulrich Drepper]

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Boehm, Hans wrote:
> AFAICT, the implementation of __lll_mutex_unlock and hence pthread_mutex_unlock is currently broken on IA64.

Not unexpected.  Nobody cared to fix it yet, though.  The main problem
is that atomic_exchange should really be atomic_exchange_acq and
atomic_exchange_rel (just like the cmpxchg code).  Then the correct
variant can be used in the right place.  For lll_mutex_unlock it would
be atomic_exchange_rel.

So, if you provide an implementation for both atomic_exchange_acq (the
current should be fine) and atomic_exchange_rel I'll put it in.  The
_acq variant isn't currently used but still.  If implementing the _rel
variant means adding a memory barrier, fine, let's just do it.

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Ulrich Drepper \    ,-----------------'   \ Mountain View, CA 94041 USA
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