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ros::getGlobalCallbackQueue()->isEmpty() is true, then the queue appears to be empty.

• http://wiki.ros.org/roscpp/Overview/Callbacks%20and%20Spinning#Single-threaded_Spinning
  • From the spin() method, we can see that we can get the queue with ros::getGlobalCallbackQueue().
• http://docs.ros.org/en/diamondback/api/roscpp/html/classros_1_1CallbackQueue.html#a750d7e58bdacab3041913c0929a44142
  • Queue class document