> The `interp-only` mechanism is based on the `JavaThread` objects. Carrier and > virtual threads can temporary share the same `JavaThread`. The > `java_thread->jvmti_thread_state()` is re-linked to a virtual thread at > `mount` and to the carrier thread at `unmount`. The `JvmtiThreadState` has a > back link to the `JavaThread` which is also set for virtual thread at a > `mount` and carrier thread at an `unmount`. Just one of these two links at > the same time is set to the `JavaThread`, the other one has to be set to > `nullptr`. The `interp-only` mechanism needs this invariant. > However, there is a corner case when this invariant is broken. It happens > when the `JvmtiThreadState` for carrier thread has just been created. In such > case, the link to `JavaThread` is always `non-nullptr` even though a virtual > thread is currently mounted on a carrier thread. This simple update fixes the > issue in the `JvmtiThreadState` ctor. > > Testing: > - TBD: Mach5 tiers 1-6
Serguei Spitsyn has updated the pull request incrementally with one additional commit since the last revision: review: some tweaks for carrier thread JvmtiThreadState initialization ------------- Changes: - all: https://git.openjdk.org/jdk/pull/29436/files - new: https://git.openjdk.org/jdk/pull/29436/files/4e3ff29a..23d6f88e Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=29436&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29436&range=00-01 Stats: 15 lines in 1 file changed: 9 ins; 4 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/29436.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29436/head:pull/29436 PR: https://git.openjdk.org/jdk/pull/29436
