C++ 生产者消费之之条件变量

std::mutex mutex;
std::condition_variable cv;
std::vector<int> vec;

void Consumer() {
  std::unique_lock<std::mutex> lock(mutex);
  cv.wait(lock, [&](){ return !vec.empty(); }); // 这里可以直接使用C++的封装
  std::cout << "consumer " << vec.size() << "\n";
}

void Produce() {
  std::unique_lock<std::mutex> lock(mutex);
  vec.push_back(1);
  cv.notify_all();
  std::cout << "produce \n";
}

int main() {
  std::thread t(Consumer);
  t.detach();
  Produce();
  return 0;
}