C++中的NAPI本机模块正在部分执行(包括std：：线程)

Question

用NAPI编写的Node-js本机模块正在部分执行。

我在里面使用了多个线程。

在运行模块时，它会打印已启动的线程，但有时不会。

无论哪种方式，模块永远不会到达c++代码的末尾。

我尝试了我的c++代码作为一个独立的应用程序，工作良好，没有任何警告或错误。

我在"CMakeList.txt“中打开了异常处理

C++ 17支持已经启动，因为我使用的是运行良好的std：：文件系统。

我在"CMakeList“中使用CMakeList(需要线程)。

文件CMakeList.txt=>

cmake_minimum_required(VERSION 3.15)
# Name of the project (will be the name of the plugin)
project (addon)

set(CMAKE_CXX_STANDARD 17)
# Don't add this line if you will try_compile with boost.
set(CMAKE_CXX_STANDARD_REQUIRED ON)
option(USE_CXX_EXCEPTIONS "Enable C++ exception support" ON)
set(THREADS_PREFER_PTHREAD_FLAG ON)

find_package(Threads REQUIRED)
# Essential include files to build a node addon,
# you should add this line in every CMake.js based project.
include_directories(${CMAKE_JS_INC})

# Declare the location of the source files
file(GLOB SOURCE_FILES "cppsrc/*.cpp" "cppsrc/*.h")

# This line will tell CMake that we're building a shared library
# from the above source files
# named after the project's name
add_library(${PROJECT_NAME} SHARED ${SOURCE_FILES} ${CMAKE_JS_SRC})

# This line will give our library file a .node extension without any "lib" prefix
set_target_properties(${PROJECT_NAME} PROPERTIES PREFIX "" SUFFIX ".node")

# Essential library files to link to a node addon,
# you should add this line in every CMake.js based project.
target_link_libraries(${PROJECT_NAME} ${CMAKE_JS_LIB} ${CMAKE_THREAD_LIBS_INIT})


# Include N-API wrappers
execute_process(COMMAND node -p "require('node-addon-api').include"
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
    OUTPUT_VARIABLE NODE_ADDON_API_DIR
    )
string(REPLACE "\n" "" NODE_ADDON_API_DIR ${NODE_ADDON_API_DIR})
string(REPLACE "\"" "" NODE_ADDON_API_DIR ${NODE_ADDON_API_DIR})
target_include_directories(${PROJECT_NAME} PRIVATE ${NODE_ADDON_API_DIR})

文件package.json=>

{
"name": "test-addon",
"version": "1.0.0",
"description": "",
"author": "",
"license": "ISC",
"scripts": {
"install": "cmake-js compile"
},
"cmake-js": {
  "runtime": "electron",
"runtimeVersion": "5.0.5",
"arch": "x64"
},
"devDependencies": {},
"dependencies": {
  "cmake-js": "^5.3.0",
  "node-addon-api": "^1.6.3"
}
}

正在部分执行=>的c++代码

while (file != filePaths.end()) {
start = timeStamp();
cout << "\n" << "File: " << *file << " \n";

//process Data
pres.readRawDataList(*file);
for (int i = 0; i < hwGuess; i++) {
    begint = (i * pres.rawDataList.size()) / hwGuess;
    endt = (i + (size_t)1) * pres.rawDataList.size() / hwGuess;
    CthreadObj[i].rawData.reserve(pres.rawDataList.size() / hwGuess);
    CthreadObj[i].rawData.insert(CthreadObj[i].Pcomparison::rawData.begin(), pres.rawDataList.begin() + begint, pres.rawDataList.begin() + endt);
threads.push_back(thread([&]() { ExpSub(CthreadObj[i], PthreadObj[i]); }));
}

for (int j = 0; j < hwGuess; j++) {
  cout<<"join total 4 threads\n";
  threads.at(j).join();
}
cout<<hwGuess<<" \n";

cout<<"thread Ends \n";
pfile.writeFile(pres.results, "cppsrc/Output/0.txt");
pres.rawDataList.clear(); pres.rawDataList.shrink_to_fit();
pres.results.clear(); pres.results.shrink_to_fit();
//Processed
cout<<"While ends \n";
file++;

funtion ExpSub=>

ExpSub(Pcomparison& ThreadObjC, Ppattern& ThreadObjP) {

vector<string>::iterator rawIt;

ThreadObjC.lowerCaseRawData();
cout<<"Inside Thread\n";
ThreadObjC.extractEmailAndPassword(":");
ThreadObjC.extractEmailNamesAndWebsites();

hwGuess值为4

在上面的代码中，结果应该是打印消息"While“，而且每次都应该发生这种情况，而不是随机(检查它随机执行”线程在行中“的图像)。在这里输入图像描述

https://i.stack.imgur.com/55TGy.png

Answer 1

c++中的Lambda函数在node.js not中不能很好地工作.因此，最好在c++代码中忽略lambda。或者你也可以这样做

threads.push_back(thread(&class_namespace::ExpSub, ref(CthreadObj[i]), ref(PthreadObj[i])));

注意，您需要使用ref()来传递引用的参数。