RFR: 8320318: ObjectMonitor Responsible thread [v4]

[David Holmes]

On Fri, 27 Sep 2024 05:55:35 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Fredrik Bredberg has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 14 commits:
>> 
>>  - Update three, after the review
>>  - Merge branch 'master' into 8320318_objectmon_responsible_thread
>>  - Update two, after the review
>>  - Update one, after the review
>>  - Small fixes before the review
>>  - Merge branch 'master' into 8320318_objectmon_responsible_thread
>>  - Merge branch 'master' into 8320318_objectmon_responsible_thread
>>  - Removed _Responsible
>>  - Fixed s390
>>  - Fixed legacy locking
>>  - ... and 4 more: https://git.openjdk.org/jdk/compare/0f253d11...8140570f
>
> src/hotspot/share/runtime/objectMonitor.cpp line 312:
> 
>> 310:   // The monitor is private to or already owned by locking_thread which must be suspended.
>> 311:   // So this code may only contend with deflation.
>> 312:   assert(locking_thread == Thread::current() || locking_thread->is_obj_deopt_suspend(), "must be");
> 
> These comments and asserts seem to belong to `enter_for_with_contention_mark`. ??

And for `enter_for`

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PR Review Comment: https://git.openjdk.org/jdk/pull/19454#discussion_r1778066968