RFR: 8303563: GetCurrentThreadCpuTime and GetThreadCpuTime need further clarification for virtual threads

[Serguei Spitsyn]

On Tue, 4 Apr 2023 20:33:46 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

> This is a follow-up to [JDK-8302615](https://bugs.openjdk.org/browse/JDK-8302615) where GetCurrentThreadCpuTime and GetThreadCpuTime were changed from being not supported to optional, when called from/with a virtual thread. There are two additional sentences that need adjustment to avoid creating a conflict in the spec.
> 
> In the functions `GetCurrentThreadCpuTime` and `GetThreadCpuTime`:
> 
> The fragment:
> `"The current thread may not be a virtual thread. Otherwise, the error code"`
> 
> is replaced with:
> 
> "An implementation is not required to support this function
>  when the current thread is a virtual thread, in which case"
> 
> 
> CSR:  [JDK-8305617](https://bugs.openjdk.org/browse/JDK-8305617)

Thank you for review, David and Alan!

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PR Comment: https://git.openjdk.org/jdk/pull/13338#issuecomment-1497065943