RFR: 8338383: Implement JEP 491: Synchronize Virtual Threads without Pinning [v16]

[Patricio Chilano Mateo]

On Tue, 29 Oct 2024 22:58:31 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Patricio Chilano Mateo has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix comment in VThreadWaitReenter
>
> src/hotspot/share/runtime/continuationFreezeThaw.cpp line 316:
> 
>> 314:     pc = ContinuationHelper::return_address_at(
>> 315:            sp - frame::sender_sp_ret_address_offset());
>> 316:   }
> 
> You could do this with an overload instead:
> 
> static void set_anchor(JavaThread* thread, intptr_t* sp, address pc) {
>   assert(pc != nullptr, "");
>   [...]
> }
> static void set_anchor(JavaThread* thread, intptr_t* sp) {
>   address pc = ContinuationHelper::return_address_at(
>     sp - frame::sender_sp_ret_address_offset());
>   set_anchor(thread, sp, pc);
> }
> 
> but the compiler probably optmizes the above check just fine.

Added an overload method.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21565#discussion_r1828187178