px4_module: use px4_atomic_t

src/modules/events/send_event.cpp

@@ -113,7 +113,7 @@ void SendEvent::initialize_trampoline(void *arg)
 	}
 
 	send_event->start();
-	_object = send_event;
+	_object.store(send_event);
 }
 
 void SendEvent::cycle_trampoline(void *arg)

src/modules/land_detector/LandDetector.cpp

@@ -92,7 +92,7 @@ void LandDetector::_cycle()
 {
 	perf_begin(_cycle_perf);
 
-	if (_object == nullptr) { // not initialized yet
+	if (_object.load() == nullptr) { // not initialized yet
 		// Advertise the first land detected uORB.
 		_landDetected.timestamp = hrt_absolute_time();
 		_landDetected.freefall = false;
@@ -110,7 +110,7 @@ void LandDetector::_cycle()
 
 		_check_params(true);
 
-		_object = this;
+		_object.store(this);
 	}
 
 	_check_params(false);

src/modules/load_mon/load_mon.cpp

@@ -151,7 +151,7 @@ int LoadMon::task_spawn(int argc, char *argv[])
 		return ret;
 	}
 
-	_object = obj;
+	_object.store(obj);
 	_task_id = task_id_is_work_queue;
 	return 0;
 }

src/modules/wind_estimator/wind_estimator_main.cpp

@@ -173,7 +173,7 @@ WindEstimatorModule::cycle_trampoline(void *arg)
 			return;
 		}
 
-		_object = dev;
+		_object.store(dev);
 	}
 
 	if (dev) {