adding mutex lock around map resizing due to dynamic parameter changes and associated processes (#4373) (#4377)

(cherry picked from commit b0abc78)

Co-authored-by: Steve Macenski <[email protected]>

Author: mergify[bot]

nav2_costmap_2d/include/nav2_costmap_2d/costmap_2d_ros.hpp

@@ -348,6 +348,7 @@ class Costmap2DROS : public nav2_util::LifecycleNode
   std::atomic<bool> stop_updates_{false};
   std::atomic<bool> initialized_{false};
   std::atomic<bool> stopped_{true};
+  std::mutex _dynamic_parameter_mutex;
   std::unique_ptr<std::thread> map_update_thread_;  ///< @brief A thread for updating the map
   rclcpp::Time last_publish_{0, 0, RCL_ROS_TIME};
   rclcpp::Duration publish_cycle_{1, 0};

nav2_costmap_2d/src/costmap_2d_ros.cpp

@@ -508,6 +508,9 @@ Costmap2DROS::mapUpdateLoop(double frequency)
 
     // Execute after start() will complete plugins activation
     if (!stopped_) {
+      // Lock while modifying layered costmap and publishing values
+      std::scoped_lock<std::mutex> lock(_dynamic_parameter_mutex);
+
       // Measure the execution time of the updateMap method
       timer.start();
       updateMap();
@@ -708,6 +711,7 @@ Costmap2DROS::dynamicParametersCallback(std::vector<rclcpp::Parameter> parameter
 {
   auto result = rcl_interfaces::msg::SetParametersResult();
   bool resize_map = false;
+  std::lock_guard<std::mutex> lock_reinit(_dynamic_parameter_mutex);
 
   for (auto parameter : parameters) {
     const auto & type = parameter.get_type();
@@ -803,6 +807,7 @@ Costmap2DROS::dynamicParametersCallback(std::vector<rclcpp::Parameter> parameter
     layered_costmap_->resizeMap(
       (unsigned int)(map_width_meters_ / resolution_),
       (unsigned int)(map_height_meters_ / resolution_), resolution_, origin_x_, origin_y_);
+    updateMap();
   }
 
   result.successful = true;