我如何使线程顺序运行而不是并发？ [英] How do I make threads run sequentially instead of concurrently?

问题描述

例如我想让每个线程在上一个线程完成之前不会开始运行，是否有一个标志，例如 thread.isRunning（）？

For example I want each thread to not start running until the previous one has completed, is there a flag, something like thread.isRunning()?

#include <iostream>
#include <vector>
#include <thread>
using namespace std;

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

int main() {

    vector<thread> threads;

    for (int i = 0; i < 5; ++i)
        threads.push_back(thread(hello));


    for (thread& thr : threads)
        thr.join();

    cin.get();
    return 0;
}

我知道线程是并发运行的，如果我想控制顺序？

I know that the threads are meant to run concurrently, but what if I want to control the order?

推荐答案

如果我们需要第二个线程开始在第一个线程之后运行

If we need the second thread start to run after the first one is completed, is a thread really needed?

对于解决方案我想尝试设置一个全局标志，设置第一个线程中的值，并且当启动第二个线程，检查标志首先应该工作。

For solution I think try to set a global flag, the set the value in the first thread, and when start the second thread, check the flag first should work.

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