kernel: add rt_critical_level that return the lock count of scheduler

Out side world may be interested in whether the scheduler is locked or
not. Provide an API to tell that.

1 files changed, 1 insertions, 0 deletions

diff --git a/include/rtthread.h b/include/rtthread.h
index b68a301a5c..0891ed9bcc 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -173,6 +173,7 @@ void rt_schedule_remove_thread(struct rt_thread *thread);
 
 void rt_enter_critical(void);
 void rt_exit_critical(void);
+rt_uint16_t rt_critical_level(void);
 
 #ifdef RT_USING_HOOK
 void rt_scheduler_sethook(void (*hook)(rt_thread_t from, rt_thread_t to));