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 107:

> 105:             public void postInterrupt() {
> 106:                 try {
> 107:                     AbstractInterruptibleChannel.this.close();

Before the current change, the `Interruptible` implementation in this class used to call `AbstractInterruptibleChannel.this.implCloseChannel();` whereas now it calls `close()`. Is that an intentional change?

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PR Review Comment: https://git.openjdk.org/jdk/pull/17219#discussion_r1443152626