RFR: 8323807: Async UL: Add a stalling mode to async UL [v8]

Wed Jan 22 14:08:16 UTC 2025

On Wed, 22 Jan 2025 10:13:09 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

>Can _data_availiable be a signal for both the _buffer and the _stalled_message?

We can have that in this check, but the `_stalled_message` is needed to communicate that a `_stalled_message`exists. It seems easier to reason about two signals, as we can take care of each one after another.

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PR Review Comment: https://git.openjdk.org/jdk/pull/22770#discussion_r1925380003