Callback-group-level Executor Sample Clauses

Callback-group-level Executor. ‌ The Callback-group-level Executor was an early prototype for a refined rclcpp Executor API devel- oped in micro-ROS. It has been derived from the default rclcpp Executor and addresses some of the aforementioned deficits. Most important, it was used to validate that the underlying layers (rcl, rmw, rmw_adapter, DDS) allow for multiple Executor instances without any negative interferences. As the default rclcpp Executor works at a node-level granularity – which is a limitation given that a node may issue different callbacks needing different real-time guarantees - we decided to refine the API for more fine-grained control over the scheduling of callbacks on the granu- larity of callback groups using. We leverage the callback-group concept existing in rclcpp by introducing real-time profiles such as RT-CRITICAL and BEST-EFFORT in the callback-group API (i.e. rclcpp/callback_group.hpp). Each callback needing specific real-time guarantees, when created, may therefore be associated with a dedicated callback group. With this in place, we enhanced the Executor and depending classes (e.g., for memory allocation) to operate at a finer callback-group granularity. This allows a single node to have callbacks with different real-time profiles assigned to different Executor instances - within one process. Thus, an Executor instance can be dedicated to specific callback group(s) and the Executor’s thread(s) can be prioritized according to the real-time requirements of these groups. For example, all time- critical callbacks are handled by an “RT-CRITICAL” Executor instance running at the highest sched- uler priority. The following figure illustrates this approach with two nodes served by three Callback-group-level Executors in one process: The different callbacks of the Drive-Base node are distributed to different Executors (visualized by the color red, yellow and green). For example the onCmdVel and publishWheelTicks callback are scheduled by the same Executor (yellow). Callbacks from different nodes can be serviced by the same Executor.
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