ArkTS注册后，C++启动的业务线程收到消息通知ArkTS层的一种思路

napi_get_cb_info
napi_create_reference
uv_queue_work
napi_open_handle_scope
napi_get_reference_value
napi_call_function
napi_delete_reference
napi_close_handle_scope
pthread_create
pthread_detach

@Entry 
@Component 
struct Index { 
  @State message: string = 'Hello World'; 
 
  build() { 
    Row() { 
      Column() { 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
          .onClick(() => { 
            hilog.info(0x0000, 'testTag', 'Test NAPI 2 + 3 = %{public}d', testNapi.add(2, 3)); 
            testNapi.regArkts((result: number)=>{ 
              hilog.info(0x0000, 'testTag', 'Test regArkts %{public}d', result); 
              this.message = 'result is ' + result.toString(); 
            }); 
          }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}

static napi_value RegArkts(napi_env env, napi_callback_info info) { 
    OH_LOG_INFO(LOG_APP, "thread id0  %{public}d.\n", pthread_self()); 
  
    size_t argc = 1; 
    napi_value argv[1] = {0}; 
napi_value thisVar = nullptr; 
void *data = nullptr; 
napi_get_cb_info(env, info, &argc, argv, &thisVar, &data); 
 
napi_valuetype valueType = napi_undefined; 
napi_typeof(env, argv[0], &valueType); 
if (valueType != napi_function) { 
  return nullptr; 
} 
if (g_CallbackContext == nullptr) { 
  g_CallbackContext = new CallbackContext(); 
} 
g_CallbackContext->env = env; 
napi_create_reference(env, argv[0], 1, &g_CallbackContext->callbackRef); 
 
return thisVar; 
}

       } 
  
            delete context; 
        }); 
    return nullptr; 
} 
static void InitServiceThread() 
{ 
    pthread_t mythread; 
    if (pthread_create(&mythread, nullptr, CallbackTest, nullptr) != 0) { 
        return; 
    } 
}

export const regArkts: (callback:(result:number)=>void) => number;