Method put

3rdparty/libprocess/include/process/queue.hpp:35–54

TODO(bmahler): Take a T&& here instead.

  // TODO(bmahler): Take a T&& here instead.
  void put(const T& t)
  {
    // NOTE: We need to grab the promise 'date->promises.front()' but
    // set it outside of the critical section because setting it might
    // trigger callbacks that try to reacquire the lock.
    Owned<Promise<T>> promise;

    synchronized (data->lock) {
      if (data->promises.empty()) {
        data->elements.push(t);
      } else {
        promise = data->promises.front();
        data->promises.pop_front();
      }
    }

    if (promise.get() != nullptr) {
      promise->set(t);
    }
  }

  Future<T> get()
  {