Integrated: 8258284: clean up issues with nested ThreadsListHandles

[Daniel D.Daugherty]

On Fri, 18 Dec 2020 17:07:27 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

> While working on JDK-8231627, I discovered there were issues with nested
> ThreadsListHandles. I added a new test to verify how ThreadsListHandles and
> nested ThreadsListHandles are supposed to work. I found two bugs:
> 
> 1) A failure to restore the expected _threads_hazard_ptr when a nested
>     ThreadsListHandle is destroyed.
> 
> 2) A failure to decrement _nested_threads_hazard_ptr_cnt when a nested
>     ThreadsListHandle is destroyed.
> 
> The second failure mode is what tripped up my fix for JDK-8231627 so that
> bug fix depends on this bug fix.
> 
> Mach5 Tier[1-3] testing has no regressions (macOSX testing is incomplete at the moment).

This pull request has now been integrated.

Changeset: 172af152
Author:    Daniel D. Daugherty <dcubed at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/172af152
Stats:     720 lines in 4 files changed: 705 ins; 5 del; 10 mod

8258284: clean up issues with nested ThreadsListHandles

Reviewed-by: eosterlund, rehn

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

PR: https://git.openjdk.java.net/jdk/pull/1844