RFR: 8349002: GenShen: Deadlock during shutdown

[William Kemper]

On Wed, 29 Jan 2025 21:53:05 GMT, William Kemper <wkemper at openjdk.org> wrote:

> [JDK-8345970](https://bugs.openjdk.org/browse/JDK-8345970) changed the order in which the control thread and regulator thread are shutdown. The new order (in which the control thread is shutdown first), may leave the regulator thread waiting indefinitely for a gc cycle that will never start.

Yes, the regulator thread is in a wait loop until the gc mode is not `none`.

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PR Comment: https://git.openjdk.org/jdk/pull/23358#issuecomment-2625045467