C++多线程

1.新建文件夹multi_thread

2.cd multi_thread

3.新建CMakeFiles.txt

cmake_minimum_required(VERSION 3.20)
project(multi_thread)
set(CMAKE_CXX_STANDARD 11)

add_executable(thread main.cpp)

4.新建main.cpp

#include<bits/stdc++.h>
#include<thread>
#include<mutex>
using namespace std;

mutex mu_;
int global;

void callback(int i)
{
    cout<<"this is thread "<<i<<endl;
    unique_lock<mutex>lock(mu_);//全局变量加锁，防止多线程干扰
    global+=20;
    lock.unlock();
}

int main(int argc,const char** argv)
{
    cout<<"hello world"<<endl;

    vector<int>g;
    vector<thread>thread_list{};//用vector创建多线程
    for(int i=1;i<=10;i++)
    {
        //std::ref(g)
        thread_list.push_back(thread (callback,i));
    }
    for(int i=1;i<=10;i++)
    {
        thread_list[i-1].join();//结束多线程
    }
    cout<<global<<endl;
    // thread t1(callback,1);
    // t1.join();

    return 0;
}

5.编译运行

cd multi_thread

cmake .

make

./thread