RFR: 8268164: Adopt cast notation for WorkerThread conversions

[Albert Mingkun Yang]

On Thu, 3 Jun 2021 11:38:07 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> I wonder if it wouldn't be nicer to be able to write:
> 
> ```
> WorkerThread::current()->id()
> ```

That will cause a compiling error:


src/hotspot/share/gc/shared/referenceProcessor.cpp:933:35: error: no member named 'id' in 'Thread'
    id = WorkerThread::current()->id();
         ~~~~~~~~~~~~~~~~~~~~~~~  ^
1 error generated.

`WorkerThread` doesn't have a static `current()` method, so it will get the one from `Thread`, which returns a `Thread*`. However, `id()` is only defined for `WorkerThread`, not `Thread`.

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PR: https://git.openjdk.java.net/jdk/pull/4334