RFR: 8223312: Utilize handshakes instead of is_thread_fully_suspended [v3]

[David Holmes]

On Wed, 21 Oct 2020 17:15:01 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> Robbin Ehn has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains seven commits:
>> 
>>  - Fixed merge miss
>>  - Merge branch 'master' into 8223312-Utilize-handshakes-instead-of-is_thread_fully_suspended
>>  - Merge fix from Richard
>>  - Merge branch 'master' into 8223312-Utilize-handshakes-instead-of-is_thread_fully_suspended
>>  - Removed TraceSuspendDebugBits
>>  - Removed unused method is_ext_suspend_completed_with_lock
>>  - Utilize handshakes instead of is_thread_fully_suspended
>
> src/hotspot/share/prims/jvmtiEnvBase.cpp line 1661:
> 
>> 1659:   assert(vf->frame_pointer() != NULL, "frame pointer mustn't be NULL");
>> 1660:   if (java_thread->is_exiting() || java_thread->threadObj() == NULL) {
>> 1661:     return;
> 
> What's the `_result` value if this `return` executes?

The default "not alive" value.

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PR: https://git.openjdk.java.net/jdk/pull/729