src/hotspot/share/runtime/jniHandles.cpp

*** 124,133 ****
--- 124,138 ----
  }
  
  template oop JNIHandles::resolve_jweak<true>(jweak);
  template oop JNIHandles::resolve_jweak<false>(jweak);
  
+ bool JNIHandles::is_global_weak_cleared(jweak handle) {
+   assert(is_jweak(handle), "not a weak handle");
+   return guard_value<false>(jweak_ref(handle)) == NULL;
+ }
+ 
  void JNIHandles::destroy_global(jobject handle) {
    if (handle != NULL) {
      assert(is_global_handle(handle), "Invalid delete of global JNI handle");
      jobject_ref(handle) = deleted_handle();
    }