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

[Erik Österlund]

On Thu, 24 Dec 2020 17:33:21 GMT, Daniel D. Daugherty <dcubed 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. We have something similar in the precious GC log code during error reporting.

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Marked as reviewed by eosterlund (Reviewer).

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