On Sat, 16 Mar 2024 22:33:49 GMT, Serguei Spitsyn <sspit...@openjdk.org> wrote:
>> Please, review this fix correcting the JVMTI `RawMonitorWait()`
>> implementation.
>> The `RawMonitorWait()` is using the the `jt->is_interrupted(true)` to
>> update the interrupt status of the interrupted waiting thread. The issue is
>> that when it calls `jt->is_interrupted(true)` to fetch and clear the
>> `interrupt status` of the virtual thread, this information is not propagated
>> to the `java.lang.Thread` instance.
>> In the `VirtualThread` class implementation the `interrupt status` for
>> virtual thread is stored for both virtual and carrier threads. It is because
>> the implementation of object monitors for virtual threads is based on
>> pinning virtual threads, and so, always operates on carrier thread. The fix
>> is to clear the interrupt status for both virtual and carrier
>> `java.lang.Thread` instances.
>>
>> Testing:
>> - tested with new test
>> `hotspot/jtreg/serviceability/jvmti/vthread/InterruptRawMonitor` which is
>> passed with the fix and failed without it
>> - ran mach5 tiers 1-6
>
> Serguei Spitsyn has updated the pull request incrementally with one
> additional commit since the last revision:
>
> review: made current changes limitedto just RawMonitorWait
src/hotspot/share/runtime/javaThread.cpp line 596:
> 594: // Checks and clears the interrupt status for platform or virtual thread.
> 595: // Used by the JVMTI RawMonitorWait only.
> 596: bool JavaThread::is_interrupted() {
Reading code that uses JavaThread::is_interrupted() won't be clear that it
resets the interrupt status. Can this be something that
get_and_clear_interrupted or something that makes it clearer?
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PR Review Comment: https://git.openjdk.org/jdk/pull/18093#discussion_r1527652412
