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updated VM_SetNotifyJvmtiEventsMode to correct jt->jvmti_thread_state() and jt->jvmti_vthread() if necessary (needed to fix JvmtiThreadState double-deallocation issue).

renamed VMop: InitNotifyJvmtiEventsMode => SetNotifyJvmtiEventsMode.

updated JVM_VirtualThreadHideFrames and Librar圜allKit::inline_native_notify_jvmti_hide to always (unconditionally) set the temporary VTMS transition bit to avoid asserts.

(3) Extended libToggleNotifyJvmtiTest.cpp to request more JVMTI events: VirtualThreadEnd, ThreadStart and ThreadEnd (2) Refactored the ToggleNotifyJvmtiTest.java to run isolated sequential test cycles for the sake of disable_virtual_threads_notify_jvmti safety (no virtual threads are allowed to run when it is executed)

added comments to ToggleNotifyJvmtiTest.java.

added comments for two new functions in jvmtiEnvBase (enabling and disabling notifyJvmti events).

fixed the typo in disable_virtual_threads_notify_jvmti.

fixed minor issues in libToggleNotifyJvmtiTest.cpp: added volatile specifier and removed unneeded static variable.Pushed a couple of updates which include: $ git pull pull/13133/head Using Skara CLI tools Chris Plummer ( - Reviewer) ⚠️ Review applies to aef87273.Patricio Chilano Mateo ( - Reviewer) ⚠️ Review applies to d38e53fd.Leonid Mesnik ( - Reviewer) ⚠️ Review applies to 1bb250a7.JDK-8297286: runtime/vthread tests crashing after JDK-8296324.Change must not contain extraneous whitespace.Change must be properly reviewed (1 review required, with at least 1 Reviewer).

In progress: Run the tiers 1-6 to make sure there are no regression.

Runtime/vthread/TestObjectAllocationSampleEvent.java

The originally failed tests are expected to pass now:.

New test: serviceability/jvmti/vthread/ToggleNotifyJvmtiTest.New regression test: serviceability/jvmti/vthread/ToggleNotifyJvmtiTest.New WhiteBox function WB_SetVirtualThreadsNotifyJvmtiMode(JNIEnv* env, jobject wb, jboolean enable) needed for testing of this update.New function JvmtiEnvBase::disable_virtual_threads_notify_jvmti() which is needed for testing.This function executes a VM operation counting VTMS transition bits in all JavaThread's to correctly set the static counter _VTMS_transition_count needed for VTMS transition protocol. New function JvmtiEnvBase::enable_virtual_threads_notify_jvmti() which does enabling JVMTI VTMS transition notifications in case of agent loaded into running VM.The fix is to enable virtual threads support for late binding JVMTI agents.