RFR: 8253694: Remove Thread::muxAcquire() from ThreadCrashProtection()

[Coleen Phillimore]

On Mon, 28 Sep 2020 06:07:58 GMT, Patricio Chilano Mateo <pchilanomate at openjdk.org> wrote:

> Hi all,
> 
> Please review the following patch. Current ThreadCrashProtection() implementation uses static members which requires
> the use of Thread::muxAcquire() to allow only one user at a time. We can avoid this synchronization requirement if each
> thread has its own ThreadCrashProtection *data. I tested it builds on Linux, macOS and Windows. Since the
> JfrThreadSampler is the only one using this I run all the tests from test/jdk/jdk/jfr/. I also run some tests with JFR
> enabled while forcing a crash in OSThreadSampler::protected_task() and tests passed with several "Thread method sampler
> crashed" UL output. Also run tiers1-3.  Thanks, Patricio

src/hotspot/share/runtime/thread.hpp line 756:

> 754:   }
> 755: #endif
> 756:

Could this be pushed down into osThread ?

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PR: https://git.openjdk.java.net/jdk/pull/376