> The implementation of the JVM TI `GetCurrentContendedMonitor()` does not > match the spec. It can sometimes return an incorrect information about the > contended monitor. Such a behavior does not match the function spec. > With this update the `GetCurrentContendedMonitor()` is returning the monitor > only when the specified thread is waiting to enter or re-enter the monitor, > and the monitor is not returned when the specified thread is waiting in the > `java.lang.Object.wait` to be notified. > > The implementations of the JDWP `ThreadReference.CurrentContendedMonitor` > command and JDI `ThreadReference.currentContendedMonitor()` method are based > and depend on this JVMTI function. The JDWP command and the JDI method were > specified incorrectly and had incorrect behavior. The fix slightly corrects > both the JDWP and JDI specs. The JDWP and JDI implementations have been also > fixed because they use this JVM TI update. Please, see and review the related > CSR and Release-Note. > > CSR: [8326024](https://bugs.openjdk.org/browse/JDK-8326024): JVM TI > GetCurrentContendedMonitor is implemented incorrectly > RN: [8326038](https://bugs.openjdk.org/browse/JDK-8326038): Release Note: > JVM TI GetCurrentContendedMonitor is implemented incorrectly > > Testing: > - tested with the mach5 tiers 1-6
Serguei Spitsyn has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision: - Merge - review: updated test desciption for two modified tests - review: added new internal function JvmtiEnvBase::get_thread_or_vthread_state - review: replaced timed with timed-out in JDWP and JDI spec - Merge - Merge - fix specs: JDWP ThreadReference.CurrentContendedMonitor command, JDI ThreadReference.currentContendedMonitor method - 8256314: JVM TI GetCurrentContendedMonitor is implemented incorrectly ------------- Changes: - all: https://git.openjdk.org/jdk/pull/17944/files - new: https://git.openjdk.org/jdk/pull/17944/files/289f6ff7..ce8ae8a8 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=17944&range=07 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17944&range=06-07 Stats: 79955 lines in 822 files changed: 6246 ins; 71952 del; 1757 mod Patch: https://git.openjdk.org/jdk/pull/17944.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/17944/head:pull/17944 PR: https://git.openjdk.org/jdk/pull/17944
