Method Pop

include/singa/utils/safe_queue.h:56–61

* Pop an element from the queue. * It will be blocked until one element is poped. */

   * It will be blocked until one element is poped.
   */
  void Pop(T& e) {
    std::unique_lock<std::mutex> lock(mutex_);
    condition_.wait(lock, [this]() { return !queue_.empty(); });
    e = queue_.front();
    queue_.pop();
  }
  /**
   * Pop an item from the queue until one element is poped or timout.
   * @param[in] timeout, return false after waiting this number of microseconds