mutex/example3.cpp

// timed_mutex::try_lock_for example
#include <iostream>       // std::cout
#include <chrono>         // std::chrono::milliseconds
#include <thread>         // std::thread
#include <mutex>          // std::timed_mutex

std::timed_mutex mtx;

void fireworks () {
  // waiting to get a lock: each thread prints "-" every 200ms:
  while (!mtx.try_lock_for(std::chrono::milliseconds(2))) {
    std::cout << "-";
  }
  // got a lock! - wait for 1s, then this thread prints "*"
  std::this_thread::sleep_for(std::chrono::milliseconds(10));
  std::cout << "*\n";
  mtx.unlock();
}

int main ()
{
  std::thread threads[10];
  // spawn 10 threads:
  for (int i=0; i<10; ++i) {
    threads[i] = std::thread(fireworks);
  }
  for (auto& th : threads) th.join();
  return 0;
}