RFR: 8256474: Migrate Mutex _owner accesses to use Atomic operations [v3]

[Coleen Phillimore]

On Tue, 1 Dec 2020 12:21:58 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> src/hotspot/share/runtime/mutex.hpp line 90:
>> 
>>> 88:   // than the lock owner are inherently racy.
>>> 89:   Thread* volatile _owner;
>>> 90:   void raw_set_owner(Thread* new_owner) { Atomic::store(&_owner, new_owner); }
>> 
>> set_owner_relaxed might be a better name.  Your call...
>
> Don't like 'relaxed'.  I'm not a huge fan of raw, since it's not raw here, but leave it.  It's fine.

Thanks for restoring 'volatile'.

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PR: https://git.openjdk.java.net/jdk/pull/1402