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/java/nio/channels/spi/AbstractInterruptibleChannel.java line 180:

> 178:         Thread me = Thread.currentThread();
> 179:         if (me.isInterrupted()) {
> 180:             interruptor.interrupt(me);

The new javadoc comment on `Interruptor.interrupt(Thread)` states that "This method is invoked while holding the Thread's interrupt lock.", which isn't the case when being invoked from here.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17219#discussion_r1443147621