[kernel] rt_scheduler_lock_nest使用原子操作

Author: Ryan-CW-Code

src/scheduler_up.c

@@ -31,6 +31,7 @@
  * 2023-03-27     rose_man     Split into scheduler upc and scheduler_mp.c
  * 2023-10-17     ChuShicheng  Modify the timing of clearing RT_THREAD_STAT_YIELD flag bits
  * 2025-08-04     Pillar       Add rt_scheduler_critical_switch_flag
+ * 2025-08-20     RyanCW       rt_scheduler_lock_nest use atomic operations
  */
 
 #define __RT_IPC_SOURCE__
@@ -49,7 +50,7 @@ rt_uint8_t rt_thread_ready_table[32];
 #endif /* RT_THREAD_PRIORITY_MAX > 32 */
 
 extern volatile rt_atomic_t rt_interrupt_nest;
-static rt_int16_t rt_scheduler_lock_nest;
+static rt_atomic_t rt_scheduler_lock_nest;
 rt_uint8_t rt_current_priority;
 
 static rt_int8_t rt_scheduler_critical_switch_flag;
@@ -649,22 +650,9 @@ RTM_EXPORT(rt_exit_critical_safe);
  */
 rt_base_t rt_enter_critical(void)
 {
-    rt_base_t level;
     rt_base_t critical_level;
 
-    /* disable interrupt */
-    level = rt_hw_interrupt_disable();
-
-    /*
-     * the maximal number of nest is RT_UINT16_MAX, which is big
-     * enough and does not check here
-     */
-    rt_scheduler_lock_nest ++;
-    critical_level = rt_scheduler_lock_nest;
-
-    /* enable interrupt */
-    rt_hw_interrupt_enable(level);
-
+    critical_level = rt_atomic_add(&rt_scheduler_lock_nest, 1) + 1;
     return critical_level;
 }
 RTM_EXPORT(rt_enter_critical);
@@ -722,7 +710,7 @@ RTM_EXPORT(rt_exit_critical);
  */
 rt_uint16_t rt_critical_level(void)
 {
-    return rt_scheduler_lock_nest;
+    return (rt_uint16_t)rt_atomic_load(&rt_scheduler_lock_nest);
 }
 RTM_EXPORT(rt_critical_level);