Method Push

include/singa/utils/safe_queue.h:45–50

* Push an element into the queue. Blocking operation. * @return true if success; */

   * @return true if success;
   */
  bool Push(const T& e) {
    std::lock_guard<std::mutex> lock(mutex_);
    queue_.push(e);
    condition_.notify_one();
    return true;
  }

  /**
   * Pop an element from the queue.