diff --git a/include/nuttx/mutex.h b/include/nuttx/mutex.h
index 6299fd35e3..315a232924 100644
--- a/include/nuttx/mutex.h
+++ b/include/nuttx/mutex.h
@@ -336,6 +336,65 @@ int nxmutex_breaklock(FAR mutex_t *mutex, FAR unsigned int *locked);
 
 int nxmutex_restorelock(FAR mutex_t *mutex, unsigned int locked);
 
+/****************************************************************************
+ * Name: nxmutex_set_protocol
+ *
+ * Description:
+ *   This function attempts to set the priority protocol of a mutex.
+ *
+ * Parameters:
+ *   mutex        - mutex descriptor.
+ *   protocol     - mutex protocol value to set.
+ *
+ * Return Value:
+ *   This is an internal OS interface and should not be used by applications.
+ *   It follows the NuttX internal error return policy:  Zero (OK) is
+ *   returned on success.  A negated errno value is returned on failure
+ *
+ ****************************************************************************/
+
+int nxmutex_set_protocol(FAR mutex_t *mutex, int protocol);
+
+/****************************************************************************
+ * Name: nxmutex_getprioceiling
+ *
+ * Description:
+ *   This function attempts to get the priority ceiling of a mutex.
+ *
+ * Parameters:
+ *   mutex        - mutex descriptor.
+ *   prioceiling  - location to return the mutex priority ceiling.
+ *
+ * Return Value:
+ *   This is an internal OS interface and should not be used by applications.
+ *   It follows the NuttX internal error return policy:  Zero (OK) is
+ *   returned on success.  A negated errno value is returned on failure
+ *
+ ****************************************************************************/
+
+int nxmutex_getprioceiling(FAR const mutex_t *mutex, FAR int *prioceiling);
+
+/****************************************************************************
+ * Name: nxmutex_setprioceiling
+ *
+ * Description:
+ *   This function attempts to set the priority ceiling of a mutex.
+ *
+ * Parameters:
+ *   mutex        - mutex descriptor.
+ *   prioceiling  - mutex priority ceiling value to set.
+ *   old_ceiling  - location to return the mutex ceiling priority set before.
+ *
+ * Return Value:
+ *   This is an internal OS interface and should not be used by applications.
+ *   It follows the NuttX internal error return policy:  Zero (OK) is
+ *   returned on success.  A negated errno value is returned on failure
+ *
+ ****************************************************************************/
+
+int nxmutex_setprioceiling(FAR mutex_t *mutex, int prioceiling,
+                           FAR int *old_ceiling);
+
 /****************************************************************************
  * Name: nxrmutex_init
  *
@@ -615,6 +674,13 @@ int nxrmutex_breaklock(FAR rmutex_t *rmutex, FAR unsigned int *count);
 
 int nxrmutex_restorelock(FAR rmutex_t *rmutex, unsigned int count);
 
+#define nxrmutex_set_protocol(rmutex, protocol) \
+        nxmutex_set_protocol(&(rmutex)->mutex, protocol)
+#define nxrmutex_getprioceiling(rmutex, prioceiling) \
+        nxmutex_getprioceiling(&(rmutex)->mutex, prioceiling)
+#define nxrmutex_setprioceiling(rmutex, prioceiling, old_ceiling) \
+        nxmutex_setprioceiling(&(rmutex)->mutex, prioceiling, old_ceiling)
+
 #undef EXTERN
 #ifdef __cplusplus
 }
diff --git a/libs/libc/misc/lib_mutex.c b/libs/libc/misc/lib_mutex.c
index a00df061fe..ae783a1f88 100644
--- a/libs/libc/misc/lib_mutex.c
+++ b/libs/libc/misc/lib_mutex.c
@@ -480,6 +480,78 @@ int nxmutex_restorelock(FAR mutex_t *mutex, unsigned int locked)
   return locked ? nxmutex_lock(mutex) : OK;
 }
 
+/****************************************************************************
+ * Name: nxmutex_set_protocol
+ *
+ * Description:
+ *   This function attempts to set the priority protocol of a mutex.
+ *
+ * Parameters:
+ *   mutex        - mutex descriptor.
+ *   protocol     - mutex protocol value to set.
+ *
+ * Return Value:
+ *   This is an internal OS interface and should not be used by applications.
+ *   It follows the NuttX internal error return policy:  Zero (OK) is
+ *   returned on success.  A negated errno value is returned on failure
+ *
+ ****************************************************************************/
+
+int nxmutex_set_protocol(FAR mutex_t *mutex, int protocol)
+{
+  return nxsem_set_protocol(&mutex->sem, protocol);
+}
+
+/****************************************************************************
+ * Name: nxmutex_getprioceiling
+ *
+ * Description:
+ *   This function attempts to get the priority ceiling of a mutex.
+ *
+ * Parameters:
+ *   mutex        - mutex descriptor.
+ *   prioceiling  - location to return the mutex priority ceiling.
+ *
+ * Return Value:
+ *   This is an internal OS interface and should not be used by applications.
+ *   It follows the NuttX internal error return policy:  Zero (OK) is
+ *   returned on success.  A negated errno value is returned on failure
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_PRIORITY_PROTECT
+int nxmutex_getprioceiling(FAR const mutex_t *mutex, FAR int *prioceiling)
+{
+  return nxsem_getprioceiling(&mutex->sem, prioceiling);
+}
+#endif
+
+/****************************************************************************
+ * Name: nxmutex_setprioceiling
+ *
+ * Description:
+ *   This function attempts to set the priority ceiling of a mutex.
+ *
+ * Parameters:
+ *   mutex        - mutex descriptor.
+ *   prioceiling  - mutex priority ceiling value to set.
+ *   old_ceiling  - location to return the mutex ceiling priority set before.
+ *
+ * Return Value:
+ *   This is an internal OS interface and should not be used by applications.
+ *   It follows the NuttX internal error return policy:  Zero (OK) is
+ *   returned on success.  A negated errno value is returned on failure
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_PRIORITY_PROTECT
+int nxmutex_setprioceiling(FAR mutex_t *mutex, int prioceiling,
+                           FAR int *old_ceiling)
+{
+  return nxsem_setprioceiling(&mutex->sem, prioceiling, old_ceiling);
+}
+#endif
+
 /****************************************************************************
  * Name: nxrmutex_init
  *
diff --git a/sched/pthread/pthread.h b/sched/pthread/pthread.h
index 6e7dd8b6d3..869a13606f 100644
--- a/sched/pthread/pthread.h
+++ b/sched/pthread/pthread.h
@@ -41,33 +41,39 @@
  ****************************************************************************/
 
 #ifdef CONFIG_PTHREAD_MUTEX_TYPES
-#  define mutex_init(m)          nxrmutex_init(m)
-#  define mutex_destroy(m)       nxrmutex_destroy(m)
-#  define mutex_is_hold(m)       nxrmutex_is_hold(m)
-#  define mutex_is_locked(m)     nxrmutex_is_locked(m)
-#  define mutex_is_recursive(m)  nxrmutex_is_recursive(m)
-#  define mutex_get_holder(m)    nxrmutex_get_holder(m)
-#  define mutex_reset(m)         nxrmutex_reset(m)
-#  define mutex_unlock(m)        nxrmutex_unlock(m)
-#  define mutex_lock(m)          nxrmutex_lock(m)
-#  define mutex_trylock(m)       nxrmutex_trylock(m)
-#  define mutex_breaklock(m,v)   nxrmutex_breaklock(m,v)
-#  define mutex_restorelock(m,v) nxrmutex_restorelock(m,v)
-#  define mutex_clocklock(m,t)   nxrmutex_clocklock(m,CLOCK_REALTIME,t)
+#  define mutex_init(m)               nxrmutex_init(m)
+#  define mutex_destroy(m)            nxrmutex_destroy(m)
+#  define mutex_is_hold(m)            nxrmutex_is_hold(m)
+#  define mutex_is_locked(m)          nxrmutex_is_locked(m)
+#  define mutex_is_recursive(m)       nxrmutex_is_recursive(m)
+#  define mutex_get_holder(m)         nxrmutex_get_holder(m)
+#  define mutex_reset(m)              nxrmutex_reset(m)
+#  define mutex_unlock(m)             nxrmutex_unlock(m)
+#  define mutex_lock(m)               nxrmutex_lock(m)
+#  define mutex_trylock(m)            nxrmutex_trylock(m)
+#  define mutex_breaklock(m,v)        nxrmutex_breaklock(m,v)
+#  define mutex_restorelock(m,v)      nxrmutex_restorelock(m,v)
+#  define mutex_clocklock(m,t)        nxrmutex_clocklock(m,CLOCK_REALTIME,t)
+#  define mutex_set_protocol(m,p)     nxrmutex_set_protocol(m,p)
+#  define mutex_getprioceiling(m,p)   nxrmutex_getprioceiling(m,p)
+#  define mutex_setprioceiling(m,p,o) nxrmutex_setprioceiling(m,p,o)
 #else
-#  define mutex_init(m)          nxmutex_init(m)
-#  define mutex_destroy(m)       nxmutex_destroy(m)
-#  define mutex_is_hold(m)       nxmutex_is_hold(m)
-#  define mutex_is_recursive(m)  (false)
-#  define mutex_is_locked(m)     nxmutex_is_locked(m)
-#  define mutex_get_holder(m)    nxmutex_get_holder(m)
-#  define mutex_reset(m)         nxmutex_reset(m)
-#  define mutex_unlock(m)        nxmutex_unlock(m)
-#  define mutex_lock(m)          nxmutex_lock(m)
-#  define mutex_trylock(m)       nxmutex_trylock(m)
-#  define mutex_breaklock(m,v)   nxmutex_breaklock(m, v)
-#  define mutex_restorelock(m,v) nxmutex_restorelock(m, v)
-#  define mutex_clocklock(m,t)   nxmutex_clocklock(m,CLOCK_REALTIME,t)
+#  define mutex_init(m)               nxmutex_init(m)
+#  define mutex_destroy(m)            nxmutex_destroy(m)
+#  define mutex_is_hold(m)            nxmutex_is_hold(m)
+#  define mutex_is_recursive(m)       (false)
+#  define mutex_is_locked(m)          nxmutex_is_locked(m)
+#  define mutex_get_holder(m)         nxmutex_get_holder(m)
+#  define mutex_reset(m)              nxmutex_reset(m)
+#  define mutex_unlock(m)             nxmutex_unlock(m)
+#  define mutex_lock(m)               nxmutex_lock(m)
+#  define mutex_trylock(m)            nxmutex_trylock(m)
+#  define mutex_breaklock(m,v)        nxmutex_breaklock(m, v)
+#  define mutex_restorelock(m,v)      nxmutex_restorelock(m, v)
+#  define mutex_clocklock(m,t)        nxmutex_clocklock(m,CLOCK_REALTIME,t)
+#  define mutex_set_protocol(m,p)     nxmutex_set_protocol(m,p)
+#  define mutex_getprioceiling(m,p)   nxmutex_getprioceiling(m,p)
+#  define mutex_setprioceiling(m,p,o) nxmutex_setprioceiling(m,p,o)
 #endif
 
 /****************************************************************************