RFR: 8329596: Add test for virtual threads invoking synchronized native methods

[ExE Boss]

On Wed, 3 Apr 2024 10:52:10 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> This is a test-only addition to add a test for virtual threads invoking a synchronized native method and invoking a native method that enter/exits a monitor with JNI MonitorEnter/MonitorExit. The test has been in the loom repo for some time, it can move to the main line in advance of changes to the object monitor implementation.

Nit, maybe make all re‑entrancy comments match each other:

test/jdk/java/lang/Thread/virtual/SynchronizedNative.java line 94:

> 92:         VThreadRunner.run(() -> {
> 93: 
> 94:             // enter, reenter with a synchronized native method

Suggestion:

            // enter with synchronized statement, reenter with synchronized native method

test/jdk/java/lang/Thread/virtual/SynchronizedNative.java line 265:

> 263:         VThreadRunner.run(() -> {
> 264: 
> 265:             // enter, reenter with JNI MonitorEnter

Suggestion:

            // enter with synchronized statement, reenter with JNI MonitorEnter

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PR Review: https://git.openjdk.org/jdk/pull/18600#pullrequestreview-1985402714
PR Review Comment: https://git.openjdk.org/jdk/pull/18600#discussion_r1555196757
PR Review Comment: https://git.openjdk.org/jdk/pull/18600#discussion_r1555196933