3.原子变量

全局变量,多线程操作不安全,可能会导致结果不安全

互斥锁,操作很慢,但是结果正确

原子变量,操作很快,结果正确

代码示例

#include <Windows.h>
#include <thread>
#include <iostream>
#include <tuple>
using namespace std;

void run()
{
    MessageBox(0, L"hello", L"hello", 0);
}

void runA(const wchar_t *s, const wchar_t *b)
{
    MessageBox(0, s, b, 0);
}

class myclass
{
public:
    void operator()()//C++重载
    {
        MessageBox(0, L"hello", L"hello", 0);
    }
};

void main1()
{
    thread t1[3]{ thread(run),thread(run),thread(run) };

    thread *p1 = new thread(run);
    thread *p2 = new thread(run);

    thread *p(new thread[3]{ thread(run),thread(run),thread(run) });
    //伪函数
    thread t3[3]{ thread(myclass()),thread(myclass()) ,thread(myclass()) };
    system("pause");
}

void main()
{
    //多线程带参数
    thread t1(runA, L"木头人1", L"HELLO");
    thread t2(runA, L"木头人1", L"HELLO");
    thread t3(runA, L"木头人1", L"HELLO");

    //tuple数组
    char ch = 'X';
    short sh = 129;
    int num = 1234;
    char *p = "木头人";
    tuple<char, short, int, char *>mytuple(ch, sh, num, p);
    auto i0 = get<0>(mytuple);
    cout << i0 << endl;
    auto i1 = get<1>(mytuple);
    cout << i1 << endl;
    auto i2 = get<2>(mytuple);
    cout << i2 << endl;
    auto i3 = get<3>(mytuple);
    cout << i3 << endl;
    cin.get();
}