// conditionVariable.cpp
#include <iostream>
#include <condition_variable>
#include <mutex>
#include <thread>
std::mutex mutex_;
std::condition_variable condVar;
bool dataReady{false};
void doTheWork(){
  std::cout << "Processing shared data." << std::endl;
}
void waitingForWork(){
    std::cout << "Worker: Waiting for work." << std::endl;
    std::unique_lock<std::mutex> lck(mutex_);
    condVar.wait(lck, []{ return dataReady; });
    doTheWork();
    std::cout << "Work done." << std::endl;
}
void setDataReady(){
    {
      std::lock_guard<std::mutex> lck(mutex_);
      dataReady = true;
    }
    std::cout << "Sender: Data is ready."  << std::endl;
    condVar.notify_one();
}
int main(){
  std::cout << std::endl;
  std::thread t1(waitingForWork);
  std::thread t2(setDataReady);
  t1.join();
  t2.join();
  std::cout << std::endl;
  
}