main.cpp

// Kompilieren mit: g++ -Wall main.cpp -o main -pthread -std=c++14

// Zeit unter Linux ändern: sudo date +%T -s "01:05:00"

#include <iostream>

#include <atomic>

#include <condition_variable>

#include <thread>

#include <chrono>

using namespace std::chrono_literals;

std::condition_variable cv;

std::mutex cv_m;

std::atomic<int> i{0};

void waits()

{

    std::unique_lock<std::mutex> lk(cv_m);

    auto absTimeout = std::chrono::steady_clock::now() + 15s;

    if (cv.wait_until(lk, absTimeout, [&](){ return i == 1; })) {

        // signal received

        std::cerr << "Thread finished waiting. signal received i == " << i << '\n';

  }

  else {

        std::cerr << "Thread timed out. i == " << i << '\n';

  }

}

void signals()

{

    std::this_thread::sleep_for(250s);

    {

        std::lock_guard<std::mutex> lk(cv_m);

        i = 1;

    }

    std::cerr << "Notifying...\n";

    cv.notify_all();

}

int main()

{

    std::thread t1(waits), t2(signals);

    t1.join();

    t2.join();

}