stl::thread——创建线程

 

 

 

#include <iostream>
#include<thread>
#include <ctime>
#include<chrono>

using namespace std;

#define NAME_LINE 40


volatile clock_t startt, endt;

void prt() {
    cout << "cout"<<endl;
};

void f1(int n) {
    for (int i = 0; i < n; ++i) {
        std::cout << "Thread " << n << " executing\n";
        std::this_thread::sleep_for(std:: chrono::milliseconds(10));
        prt();
    }
}

void f2(int& n) {
    for (int i = 0; i < 5; ++i) {
        std::cout << "Thread 2 executing\n"; 
        ++n;
        std::this_thread::sleep_for(std::chrono::milliseconds(10));
        prt();
    }
}


void thread_task(int n) {
    std::this_thread::sleep_for(std::chrono::seconds(n));
    std::cout << "hello thread "
        << std::this_thread::get_id()
        << " paused " << n << " seconds" << std::endl;
    
}

int main() 
{
    //experiment 1
    int n = 0;
    std::thread t1;                  // t1不再是线程
    std::thread t2(f1, n+1);         // 
    std::thread t3(f2, std::ref(n)); //
    std::thread t4(std::move(t3));   //t4现在在跑f2()，t3不再是线程了

    t2.join();  // 主线程阻塞，直到线程t2跑完它的传入函数
    t4.join();
    cout << "final value of n is:" << n << endl;


    // experiment 2
    std::thread threads[5];
    std::cout << "Spawning 5 threads...\n";
    for (int i = 0; i < 5; ++i) {
        threads[i] = std::thread(thread_task,i+1);
    }
    std::cout << "Done of spawning threads! Now wait for them to join \n";
    for (auto& t : threads) {
        t.join();
    }
    std::cout << "All threads joined.\n";

    return EXIT_SUCCESS;
}

 

C++11 并发指南二(std::thread 详解) - Haippy - 博客园 (cnblogs.com)