RFR: JDK-8259372: remove AIX related USE_LIBRARY_BASED_TLS_ONLY and THREAD_LOCAL special handling

[David Holmes]

On Thu, 7 Jan 2021 16:20:20 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> AIX 5.3 had buggy __thread support (see JDK-8176442).
> That's why we introduced a macro USE_LIBRARY_BASED_TLS_ONLY and set it only to 1 on AIX (different to the other platforms supported by the OpenJDK).
> However AIX 5.3 support was removed some time ago (currently we have a minimum requirement of AIX 7.X ) so the whole USE_LIBRARY_BASED_TLS_ONLY related coding could be removed.

Hi Matthias,
We didn't introduce USE_LIBRARY_BASED_TLS_ONLY just for AIX, it was also added to aid the mobile project:
http://mail.openjdk.java.net/pipermail/hotspot-dev/2015-November/020765.html
Before removing it we would need to have a broader discussion.
Thanks,
David

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PR: https://git.openjdk.java.net/jdk/pull/1976