RFR: 8231627: runtime/ErrorHandling/ThreadsListHandleInErrorHandlingTest.java fails because error occurred during printing all threads

[Ioi Lam]

On Mon, 4 Jan 2021 16:29:20 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> A small robustness fix in ThreadsSMRSupport::print_info_on() to reduce the
>> likelihood of crashes during error reporting. Uses Threads_lock->try_lock()
>> for safety and restricts some reporting to when the Threads_lock has been
>> acquired (depends on JDK-8256383). Uses a ThreadsListHandle to make
>> the current ThreadsList safe for reporting (depends on JDK-8258284). Also
>> detects when the system ThreadsList (_java_thread_list) has changed and
>> will warn that some of the reported info may now be stale.
>> 
>> Two existing tests have been updated to reflect the use of a ThreadsListHandle
>> in ThreadsSMRSupport::print_info_on(). Mach5 Tier[1-6] testing has no regressions.
>
> Looks good.  One comment.  Also, ha ha, Harold caught me today: you need to update the copyrights!

Maybe the PR/JBS title should be shortened to "ThreadsListHandleInErrorHandlingTest.java fails in printing all threads" for conciseness and to make GitHub happy?

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PR: https://git.openjdk.java.net/jdk/pull/1891