RFR: 8323807: Async UL: Add a stalling mode to async UL [v10]

[David Holmes]

On Thu, 23 Jan 2025 07:52:24 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> src/hotspot/share/logging/logAsyncWriter.cpp line 309:
>> 
>>> 307:   AsyncLogWriter* instance = AsyncLogWriter::instance();
>>> 308:   if (instance != nullptr) {
>>> 309:     if ((uintptr_t)instance == (uintptr_t)Thread::current_or_null()) {
>> 
>> Why the casts ??
>
> Sorry, that was sloppy of me. I still need a cast, but to the proper `Thread` type.

Why do you need a cast to `Thread`? `AsyncLogWriter` is-a NonJavaThread is-a `Thread`. `Thread::current_or_null()` returns a `Thread`.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22770#discussion_r1928111441