c++ - 运行线程

Question

我有一个程序，我试图在一个单独的线程中运行一个进程。通常我会为此使用 Qt，但在这个特定的实例中我不能(因为它会在嵌入式设备上运行)。我关心的是我当前的实现是否会正确运行线程，或者它是否会在处理之前销毁线程。下面是我的代码:

int main(){
  //code
  Processor *x = new Processor;
  //other code
  x->startThread(s);
  //more code which needs to be running seperately
}

处理器.h

Class Processor {
public:
  Processor();
  void startThread(std::string s);
  void myCode(std::string s);
  //more stuff
}

处理器.cpp

void Processor::startThread(std::string s){
  std::thread(&Processor::startRecording, s).detach();
}

void Processor::myCode(std::string s){
  //lots of code
}

或者，如果有更简单的方法从 main 函数启动 myCode 而不是需要类 startThread，请让我知道。

Answer 1

我建议您将线程作为 Processor 属性。

Run It Online

#include <iostream>
#include <memory>
#include <string>
#include <thread>

//Processor.h

class Processor {
private:
  std::shared_ptr<std::thread> _th;
public:
  Processor();
  void startThread(std::string s);
  void joinThread();
  void myCode(std::string s);
  void startRecording(std::string s);
  //more stuff
};

//Processor.cpp

Processor::Processor() {
}

void Processor::startThread(std::string s) {
  _th = std::make_shared<std::thread>(&Processor::startRecording, this, s);  // "this" is the first argument ;)
}

void Processor::joinThread() {
    _th->join();
}

void Processor::myCode(std::string s) {
  //lots of code
}

void Processor::startRecording(std::string s) {
  std::cout << "msg: " << s << std::endl;
}

// main.cpp

int main(){
  //code
  auto x = std::make_unique<Processor>();
  //other code
  x->startThread("hello");
  //more code which needs to be running seperately
  x->joinThread();
}