C++三个线程交替打印

SunrayME

于 2019-06-21 13:43:20 发布

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本文链接：https://blog.youkuaiyun.com/u013699869/article/details/93189922

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博客仅提及运行结果，但无具体内容。推测可能围绕某程序或操作的运行结果展开，不过缺乏关键信息，难以进一步概括。

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#include <iostream>
#include <condition_variable>

using namespace std;

mutex mtx;
condition_variable cond_var;
int g_index;

typedef struct {
    const char *str;
    int index;
} Param;

void fun(void *arg)
{
    Param *param = (Param *)arg;
    while (1) {
        this_thread::sleep_for(chrono::seconds(1));
        unique_lock<mutex> lck(mtx);
        int index = param->index;
        cond_var.wait(lck, [index] {return index == g_index;});
        cout << param->str << endl;
        g_index = (index + 1) % 3;
        cond_var.notify_all();
    }
}

void main()
{
    Param param0 = { "thread 0", 0 },
        param1 = { "thread 1", 1 },
        param2 = { "thread 2", 2 };
    thread t0(fun, &param0),
        t1(fun, &param1),
        t2(fun, &param2);
    t0.join();
    t1.join();
    t2.join();
}

运行结果：