RFR: 8322829: Refactor nioBlocker to avoid blocking while holding Thread's interrupt lock

[Jaikiran Pai]

On Tue, 2 Jan 2024 10:21:11 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> In preparation for when virtual threads can unmount while holding a monitor or unmount when blocking on monitorenter, the implementation of VirtualThread's interrupt method is refactored to avoid parking/blocking while holding the Thread's interrupt lock. The implementations of sun.nio.ch.Interruptible are refactored to close/wakeup the InterruptibleChannel/Selector after releasing the interrupt lock. There is a lot of test coverage for async close and interrupt, no additional tests are added.

src/java.base/share/classes/sun/nio/ch/Interruptible.java line 49:

> 47:      * Selector. This method is required to be idempotent.
> 48:      */
> 49:     void postInterrupt();

Should there be any thread safety note/expectations on this method now that it can be potentially called concurrently by multiple threads since it's called outside of the interrupt lock?

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PR Review Comment: https://git.openjdk.org/jdk/pull/17219#discussion_r1443125420