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

[Robbin Ehn]

On Wed, 21 Oct 2020 22:57:59 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> 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.

Added comment.

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