On Tue, 7 Nov 2023 14:44:52 GMT, Patricio Chilano Mateo
<pchilanom...@openjdk.org> wrote:
>> Serguei Spitsyn has updated the pull request incrementally with one
>> additional commit since the last revision:
>>
>> review: get rid of the VM_HandshakeUnmountedVirtualThread
>
> src/hotspot/share/prims/jvmtiEnvBase.cpp line 1974:
>
>> 1972:
>> 1973: if (java_lang_VirtualThread::is_instance(target_h())) { // virtual
>> thread
>> 1974: if (!JvmtiEnvBase::is_vthread_alive(target_h())) {
>
> There is only one issue I see in how this check is implemented and the
> removal of the VM_op for unmounted vthreads. The change of state to
> TERMINATED happens after notifyJvmtiUnmount(), i.e we can see that this
> vthread is alive here but a check later can return is not. This might hit the
> assert in JvmtiEnvBase::get_vthread_jvf() (maybe this the issue you saw on
> your first prototype). We can either change that order at the Java level, or
> maybe better change this function to read the state and add a case where if
> the state is RUNNING check whether the continuation is done or not
> (jdk_internal_vm_Continuation::done(cont)).
Thank you for the suggestion. Will check it.
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PR Review Comment: https://git.openjdk.org/jdk/pull/16460#discussion_r1386875290
