add return value to lv_task_handler. resolves #708

lv_misc/lv_task.c

@@ -56,21 +56,22 @@ void lv_task_init(void)
 
 /**
  * Call it  periodically to handle lv_tasks.
+ * @return true: no error; false: error ocurred
  */
-LV_ATTRIBUTE_TASK_HANDLER void lv_task_handler(void)
+LV_ATTRIBUTE_TASK_HANDLER bool lv_task_handler(void)
 {
     LV_LOG_TRACE("lv_task_handler started");
 
     /*Avoid concurrent running of the task handler*/
     static bool task_handler_mutex = false;
-    if(task_handler_mutex) return;
+    if(task_handler_mutex) return true;
     task_handler_mutex = true;
 
     static uint32_t idle_period_start = 0;
     static uint32_t handler_start = 0;
     static uint32_t busy_time = 0;
 
-    if(lv_task_run == false) return;
+    if(lv_task_run == false) return true;
 
     handler_start = lv_tick_get();
 
@@ -148,6 +149,7 @@ LV_ATTRIBUTE_TASK_HANDLER void lv_task_handler(void)
     task_handler_mutex = false;     /*Release the mutex*/
 
     LV_LOG_TRACE("lv_task_handler ready");
+    return true;
 }
 
 /**

lv_misc/lv_task.h

@@ -73,8 +73,9 @@ void lv_task_init(void);
 
 /**
  * Call it  periodically to handle lv_tasks.
+ * @return true: no error; false: error ocurred
  */
-LV_ATTRIBUTE_TASK_HANDLER void lv_task_handler(void);
+LV_ATTRIBUTE_TASK_HANDLER bool lv_task_handler(void);
 
 /**
  * Create a new lv_task