2 files changed, 21 insertions, 0 deletions
diff --git a/cpukit/score/include/rtems/score/thread.h b/cpukit/score/include/rtems/score/thread.h
index d839b1f9ec..eb272e6c01 100644
--- a/cpukit/score/include/rtems/score/thread.h
+++ b/cpukit/score/include/rtems/score/thread.h
@@ -246,6 +246,11 @@ typedef enum {
 typedef struct {
 #if defined(RTEMS_SMP)
   /**
+   * @brief Lock to protect the scheduler node change requests.
+   */
+  ISR_lock_Control Lock;
+
+  /**
    * @brief The current scheduler state of this thread.
    */
   Thread_Scheduler_state state;
diff --git a/cpukit/score/include/rtems/score/threadimpl.h b/cpukit/score/include/rtems/score/threadimpl.h
index f259e74d49..8254b97183 100644
--- a/cpukit/score/include/rtems/score/threadimpl.h
+++ b/cpukit/score/include/rtems/score/threadimpl.h
@@ -1035,6 +1035,22 @@ RTEMS_INLINE_ROUTINE Scheduler_Node *_Thread_Scheduler_get_node_by_index(
 }
 
 #if defined(RTEMS_SMP)
+RTEMS_INLINE_ROUTINE void _Thread_Scheduler_acquire_critical(
+  Thread_Control   *the_thread,
+  ISR_lock_Context *lock_context
+)
+{
+  _ISR_lock_Acquire( &the_thread->Scheduler.Lock, lock_context );
+}
+
+RTEMS_INLINE_ROUTINE void _Thread_Scheduler_release_critical(
+  Thread_Control   *the_thread,
+  ISR_lock_Context *lock_context
+)
+{
+  _ISR_lock_Release( &the_thread->Scheduler.Lock, lock_context );
+}
+
 RTEMS_INLINE_ROUTINE void _Thread_Scheduler_add_wait_node(
   Thread_Control *the_thread,
   Scheduler_Node *scheduler_node