gistfile1.txt

#include <iostream>
#include <thread>
#include <mutex>
#include <condition_variable>
#include <vector>

std::mutex              mutex;
std::condition_variable cv;
bool                    workerThreadsFinished = false;

void workerThread() {
    // Perform the worker thread's task
    std::this_thread::sleep_for(std::chrono::seconds(1));

    {
        std::lock_guard<std::mutex> lock(mutex);
        workerThreadsFinished = true;
        cv.notify_one();
    }
}

int main() {
    std::vector<std::thread> threads;

    // Create and start worker threads
    for (int i = 0; i < 4; ++i) {
        threads.emplace_back(workerThread);
    }

    while (true) {
        {
            std::unique_lock<std::mutex> lock(mutex);
            while (!workerThreadsFinished) {
                cv.wait(lock);
            }
            workerThreadsFinished = false;
        }

        // Perform the main loop's work
        std::cout << "Main loop iteration" << std::endl;
    }

    for (std::thread& thread : threads) {
        thread.join();
    }

    return 0;
}