This enhancement adds support of virtual threads to the JVMTI `StopThread` function. In preview releases before this enhancement the StopThread returned the JVMTI_ERROR_UNSUPPORTED_OPERATION error code for virtual threads.
The `StopThread` supports sending an asynchronous exception to a virtual thread only if it is current or suspended at mounted state. For instance, a virtual thread can be suspended at a JVMTI event. If the virtual thread is not suspended and is not current then the `JVMTI_ERROR_THREAD_NOT_SUSPENDED` error code is returned. If the virtual thread was suspended at unmounted state then the `JVMTI_ERROR_OPAQUE_FRAME` error code is returned. The `StopThread` has the following description for `JVMTI_ERROR_OPAQUE_FRAME` error code: > The thread is a suspended virtual thread and the implementation > was unable to throw an asynchronous exception from this frame. A couple of the `serviceability/jvmti/vthread` tests has been updated to adopt to new `StopThread` behavior. The CSR is: https://bugs.openjdk.org/browse/JDK-8306434 Testing: The mach5 tears 1-6 are in progress. Preliminary test runs were good in general. The JDB test `vmTestbase/nsk/jdb/kill/kill001/kill001.java` has been problem-listed and will be fixed by the corresponding debugger enhancement which is going to adopt JDWP/JDI specs to new behavior of the JVMTI `StopThread` related to virtual threads. Also, two JCK JVMTI tests are failing in the tier-6 : > vm/jvmti/StopThread/stop001/stop00103/stop00103.html > vm/jvmti/StopThread/stop001/stop00103/stop00103a.html These two tests will be excluded from the test runs by the JCK team and then adjusted to new `StopThread` behavior. ------------- Commit messages: - fixed trailing spaces - 8306034: add support of virtual threads to JVMTI StopThread Changes: https://git.openjdk.org/jdk/pull/13546/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13546&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8306034 Stats: 477 lines in 8 files changed: 456 ins; 8 del; 13 mod Patch: https://git.openjdk.org/jdk/pull/13546.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13546/head:pull/13546 PR: https://git.openjdk.org/jdk/pull/13546
