> The WXMode for the current thread (on MacOS aarch64) is currently stored in 
> the thread class which is unnecessary as the WXMode is bound to the current 
> OS thread, not the current instance of the thread class.
> This pull request moves the storage of the current WXMode into a thread local 
> global variable in `os` and changes all related code. SafeFetch depended on 
> the existence of a thread object only because of the WXMode. This pull 
> request therefore removes the dependency, making SafeFetch usable in more 
> contexts.

Johannes Bechberger has updated the pull request with a new target base due to 
a merge or a rebase. The pull request now contains ten commits:

 - Move code to os::current_thread_wx
 - Small fixes
 - Move WX functionality into os specific files
 - Minor fixes
 - Fix include for threadWXSetters.inline.hpp
 - Remove thread parameter from ThreadWXEnable
 - Remove thread parameter from os methods
 - Remove wx_init and current thread assert in safefetch
 - Use os::current_thread_change_wx instead of thread methods

-------------

Changes: https://git.openjdk.java.net/jdk/pull/7727/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7727&range=04
  Stats: 241 lines in 32 files changed: 52 ins; 111 del; 78 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7727.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7727/head:pull/7727

PR: https://git.openjdk.java.net/jdk/pull/7727

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