Merge pull request #4251 from Lawlieta/chenyong

[ulog] Add backend filtering interface, add async log output control interface, ulog mutex change to semaphore

components/utilities/ulog/ulog.h

@@ -24,6 +24,7 @@ extern "C" {
  * ulog init and deint
  */
 int ulog_init(void);
+int ulog_async_init(void);
 void ulog_deinit(void);
 
 /*
@@ -78,6 +79,7 @@ void ulog_flush(void);
  * asynchronous output API
  */
 void ulog_async_output(void);
+void ulog_async_output_enabled(rt_bool_t enabled);
 void ulog_async_waiting_log(rt_int32_t time);
 #endif
 

components/utilities/ulog/ulog_def.h

@@ -201,6 +201,7 @@ struct ulog_backend
 {
     char name[RT_NAME_MAX];
     rt_bool_t support_color;
+    rt_uint32_t out_level;
     void (*init)  (struct ulog_backend *backend);
     void (*output)(struct ulog_backend *backend, rt_uint32_t level, const char *tag, rt_bool_t is_raw, const char *log, size_t len);
     void (*flush) (struct ulog_backend *backend);