On 7/18/2014 7:28 AM, Mikael Pettersson wrote:
John David Anglin writes:
> Because the atomic sync functions in config/pa/linux-atomic.c are not
> lock free, we need to use
> __kernel_cmpxchg for the __sync_lock_release. This was found in
> glibc's pthread_spin_unlock
> implementation.
>
> Tested on hppa-unknown-linux-gnu. Committed to trunk.
It seems to me that ARM's linux-atomic.c has the same problem.
CC:ing some ARM folks for clarification.
It might. However, the issue is very subtle and may be parisc specific.
Carlos O'Donnel and I had a long discussion about it and couldn't come
to a clear understanding as to how the race occurs. However, without
changing the release used in glibc for the pthread_spin_unlock operation,
the spin lock tests in the kyotocabinet testsuite would consistently fail.
Dave
--
John David Anglin dave.ang...@bell.net
