add config main thread priority

components/Kconfig

@@ -13,6 +13,11 @@ if RT_USING_COMPONENTS_INIT
         config RT_MAIN_THREAD_STACK_SIZE
             int "Set main thread stack size"
             default 2048
+        config RT_MAIN_THREAD_PRIORITY
+            int "Set main thread priority" 
+            default 4  if RT_THREAD_PRIORITY_8
+            default 10  if RT_THREAD_PRIORITY_32
+            default 85  if RT_THREAD_PRIORITY_256
     endif
 endif
 

src/components.c

@@ -37,6 +37,9 @@
 #ifndef RT_MAIN_THREAD_STACK_SIZE
 #define RT_MAIN_THREAD_STACK_SIZE     2048
 #endif
+#ifndef RT_MAIN_THREAD_PRIORITY
+#define RT_MAIN_THREAD_PRIORITY       (RT_THREAD_PRIORITY_MAX / 3)
+#endif
 #endif
 
 #ifdef RT_USING_COMPONENTS_INIT
@@ -205,14 +208,14 @@ void rt_application_init(void)
 
 #ifdef RT_USING_HEAP
     tid = rt_thread_create("main", main_thread_entry, RT_NULL,
-                           RT_MAIN_THREAD_STACK_SIZE, RT_THREAD_PRIORITY_MAX / 3, 20);
+                           RT_MAIN_THREAD_STACK_SIZE, RT_MAIN_THREAD_PRIORITY, 20);
     RT_ASSERT(tid != RT_NULL);
 #else
     rt_err_t result;
 
     tid = &main_thread;
     result = rt_thread_init(tid, "main", main_thread_entry, RT_NULL,
-                            main_stack, sizeof(main_stack), RT_THREAD_PRIORITY_MAX / 3, 20);
+                            main_stack, sizeof(main_stack), RT_MAIN_THREAD_PRIORITY, 20);
     RT_ASSERT(result == RT_EOK);
 	
     /* if not define RT_USING_HEAP, using to eliminate the warning */