C++11: 多线程thread, 锁lock、lock_guard, 条件变量conditional详解

线程定义

实现并行，避免主线程的阻塞

线程实现

void func()
{
   
   
    cout<<"thread func :"<<this_thread::get_id()<<endl;
}

int main()
{
   
   
    cout<<"main thread :"<<this_thread::get_id()<<endl;
    thread t(func);
    t.join();
    cout<<"thread is over"<<endl;
    return 0;
}
输出：
main thread :1
thread func :2

ref：修改线程函数变量作用域

void func(int &n)
{
   
   
    cout<<n<<endl;
    n = 10;
}

int main()
{
   
   
    int n = 5;
    thread t(func,ref(n));
    t.join();
    cout<<n<<endl; // 10
    cout<<"thread is over"<<endl;
    return 0;
}
输出：
5
10
thread is over

join

join：阻塞主线程，子线程调用jion后，主线程需要等待子线程执行完后，再继续执行
join阻塞主进程结束，对子线程的执行没有影响

code:

void func()
{
   
   
    cout<<"thread func :"<<this_thread::get_id()<<endl;
    this_thread::sleep_for(chrono::seconds(10));
}

void func2()
{
   
   
    cout<<"thread func2 :"<<this_thread::get_id()<<endl;
    this_thread::sleep_for(chrono::