RFR: 8317433: Async UL: Only grab lock once when write():ing

[Aleksey Shipilev]

On Tue, 3 Oct 2023 14:31:43 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

> Hi,
> 
> The writer thread used to await for `_data_available` to become true through using the async log lock as a condition variable. When data is available it'd let go of the lock and then call `AsyncLogWriter::write()`, which would immediately try to acquire that same lock. We can remove this second instance by moving the work needed to be done under lock to `run`.
> 
> Thank you for considering this.

Let's include @navyxliu in this review.

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PR Comment: https://git.openjdk.org/jdk/pull/16030#issuecomment-1746932709