code: func (ctr *ContainerTaskRels) Get(containerID string) *TaskInfo {
  	ctr.Lock()
  	defer ctr.Unlock()
  	return ctr.rels[containerID]
  }
docs: // Get is a utility method which handles the mutex lock and abstracts the inner
  // map in ContainerTaskRels away. If no task info is available for the supplied
  // containerID, returns nil.