// Caller to this function must own Management_lock

void ClassLoadingService::reset_trace_class_unloading() {

  {- -------------------------------------------
  (1) CommandLineFlags::boolAtPut() を使って
      TraceClassUnloading オプションの値を変更する.

      値は, MemoryService と ClassLoadingService のどちらか片方でも verbose 状態になっていれば true, 
      どちらも verbose 状態でなければ false.
      ---------------------------------------- -}

      assert(Management_lock->owned_by_self(), "Must own the Management_lock");
      bool value = MemoryService::get_verbose() || ClassLoadingService::get_verbose();
      bool succeed = CommandLineFlags::boolAtPut((char*)"TraceClassUnloading", &value, MANAGEMENT);
      assert(succeed, "Setting TraceClassUnLoading flag fails");
    }