HarmonyOS Next开发学习手册——在非ArkTS线程中回调ArkTS接口

场景介绍

ArkTS是单线程语言，通过NAPI接口对ArkTS对象的所有操作都须保证在同一个ArkTS线程上进行。本示例将介绍通过napi_get_uv_event_loop和uv_queue_work实现在非ArkTS线程中通过NAPI接口回调ArkTS函数。

使用示例

1.接口声明、编译配置以及模块注册

接口声明

// index.d.ts
export const queueWork: (cb: (arg: number) => void) => void;

编译配置

// CMakeLists.txt
# the minimum version of CMake.
cmake_minimum_required(VERSION 3.4.1)
project(MyApplication)

set(NATIVERENDER_ROOT_PATH ${CMAKE_CURRENT_SOURCE_DIR})

include_directories(${NATIVERENDER_ROOT_PATH}
                    ${NATIVERENDER_ROOT_PATH}/include)
add_library(queue_work SHARED queue_work.cpp)
target_link_libraries(queue_work PUBLIC libace_napi.z.so libhilog_ndk.z.so libuv.so)

模块注册

// queue_work.cpp
EXTERN_C_START
static napi_value Init(napi_env env, napi_value exports)
{
    napi_property_descriptor desc[] = {
        { "queueWork", nullptr, QueueWork, nullptr, nullptr, nullptr, napi_default, nullptr }
    };
    napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);
    return exports;
}
EXTERN_C_END

static napi_module nativeModule = {
    .nm_version = 1,
    .nm_flags = 0,
    .nm_filename = nullptr,
    .nm_register_func = Init,
    .nm_modname = "queue_work",
    .nm_priv = nullptr,
    .reserved = { 0 },
};

extern "C" __attribute__((constructor)) void RegisterQueueWorkModule()
{
    napi_module_register(&nativeModule);
}

2.获取env对应的loop，并抛任务到ArkTS线程

// queue_work.cpp
#include <thread>

#include "napi/native_api.h"
#include "uv.h"

struct CallbackContext {
    napi_env env = nullptr;
    napi_r