diff --git a/src/idle.c b/src/idle.c
index a571e487cf..ec625cb4a1 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -139,7 +139,7 @@ rt_err_t rt_thread_idle_delhook(void (*hook)(void))
 
 #ifdef RT_USING_MODULE
 /* Return whether there is defunctional thread to be deleted. */
-rt_inline int _has_defunct_thread(void)
+rt_inline int _idle_has_defunct_thread(void)
 {
     /* The rt_list_isempty has prototype of "int rt_list_isempty(const rt_list_t *l)".
      * So the compiler has a good reason that the _rt_thread_defunct list does
@@ -207,7 +207,7 @@ static void rt_defunct_execute(void)
 
 #ifdef RT_USING_MODULE
         /* check whether list is empty */
-        if (!_has_defunct_thread())
+        if (!_idle_has_defunct_thread())
         {
             rt_hw_interrupt_enable(lock);
             break;
diff --git a/src/ipc.c b/src/ipc.c
index 8acfd831d7..57ac453a68 100755
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -68,7 +68,7 @@ extern void (*rt_object_put_hook)(struct rt_object *object);
  *
  * @warning  This function can be called from all IPC initialization and creation.
  */
-rt_inline rt_err_t rt_ipc_object_init(struct rt_ipc_object *ipc)
+rt_inline rt_err_t _ipc_object_init(struct rt_ipc_object *ipc)
 {
     /* initialize ipc object */
     rt_list_init(&(ipc->suspend_thread));
@@ -106,9 +106,9 @@ rt_inline rt_err_t rt_ipc_object_init(struct rt_ipc_object *ipc)
  *           rt_sem_take(),  rt_mutex_take(),  rt_event_recv(),   rt_mb_send_wait(),
  *           rt_mb_recv(),   rt_mq_recv(),     rt_mq_send_wait()
  */
-rt_inline rt_err_t rt_ipc_list_suspend(rt_list_t        *list,
-                                       struct rt_thread *thread,
-                                       rt_uint8_t        flag)
+rt_inline rt_err_t _ipc_list_suspend(rt_list_t        *list,
+                                     struct rt_thread *thread,
+                                     rt_uint8_t        flag)
 {
     /* suspend thread */
     rt_thread_suspend(thread);
@@ -175,7 +175,7 @@ rt_inline rt_err_t rt_ipc_list_suspend(rt_list_t        *list,
  *           rt_sem_release(),    rt_mutex_release(),    rt_mb_send_wait(),    rt_mq_send_wait(),
  *           rt_mb_urgent(),      rt_mb_recv(),          rt_mq_urgent(),       rt_mq_recv(),
  */
-rt_inline rt_err_t rt_ipc_list_resume(rt_list_t *list)
+rt_inline rt_err_t _ipc_list_resume(rt_list_t *list)
 {
     struct rt_thread *thread;
 
@@ -204,7 +204,7 @@ rt_inline rt_err_t rt_ipc_list_resume(rt_list_t *list)
  *           When the return value is any other values, it means this operation failed.
  *
  */
-rt_inline rt_err_t rt_ipc_list_resume_all(rt_list_t *list)
+rt_inline rt_err_t _ipc_list_resume_all(rt_list_t *list)
 {
     struct rt_thread *thread;
     register rt_ubase_t temp;
@@ -292,7 +292,7 @@ rt_err_t rt_sem_init(rt_sem_t    sem,
     rt_object_init(&(sem->parent.parent), RT_Object_Class_Semaphore, name);
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(sem->parent));
+    _ipc_object_init(&(sem->parent));
 
     /* set initial value */
     sem->value = (rt_uint16_t)value;
@@ -331,7 +331,7 @@ rt_err_t rt_sem_detach(rt_sem_t sem)
     RT_ASSERT(rt_object_is_systemobject(&sem->parent.parent));
 
     /* wakeup all suspended threads */
-    rt_ipc_list_resume_all(&(sem->parent.suspend_thread));
+    _ipc_list_resume_all(&(sem->parent.suspend_thread));
 
     /* detach semaphore object */
     rt_object_detach(&(sem->parent.parent));
@@ -386,7 +386,7 @@ rt_sem_t rt_sem_create(const char *name, rt_uint32_t value, rt_uint8_t flag)
         return sem;
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(sem->parent));
+    _ipc_object_init(&(sem->parent));
 
     /* set initial value */
     sem->value = value;
@@ -427,7 +427,7 @@ rt_err_t rt_sem_delete(rt_sem_t sem)
     RT_ASSERT(rt_object_is_systemobject(&sem->parent.parent) == RT_FALSE);
 
     /* wakeup all suspended threads */
-    rt_ipc_list_resume_all(&(sem->parent.suspend_thread));
+    _ipc_list_resume_all(&(sem->parent.suspend_thread));
 
     /* delete semaphore object */
     rt_object_delete(&(sem->parent.parent));
@@ -513,7 +513,7 @@ rt_err_t rt_sem_take(rt_sem_t sem, rt_int32_t time)
                                         thread->name));
 
             /* suspend thread */
-            rt_ipc_list_suspend(&(sem->parent.suspend_thread),
+            _ipc_list_suspend(&(sem->parent.suspend_thread),
                                 thread,
                                 sem->parent.parent.flag);
 
@@ -607,7 +607,7 @@ rt_err_t rt_sem_release(rt_sem_t sem)
     if (!rt_list_isempty(&sem->parent.suspend_thread))
     {
         /* resume the suspended thread */
-        rt_ipc_list_resume(&(sem->parent.suspend_thread));
+        _ipc_list_resume(&(sem->parent.suspend_thread));
         need_schedule = RT_TRUE;
     }
     else
@@ -667,7 +667,7 @@ rt_err_t rt_sem_control(rt_sem_t sem, int cmd, void *arg)
         level = rt_hw_interrupt_disable();
 
         /* resume all waiting thread */
-        rt_ipc_list_resume_all(&sem->parent.suspend_thread);
+        _ipc_list_resume_all(&sem->parent.suspend_thread);
 
         /* set new value */
         sem->value = (rt_uint16_t)value;
@@ -730,7 +730,7 @@ rt_err_t rt_mutex_init(rt_mutex_t mutex, const char *name, rt_uint8_t flag)
     rt_object_init(&(mutex->parent.parent), RT_Object_Class_Mutex, name);
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(mutex->parent));
+    _ipc_object_init(&(mutex->parent));
 
     mutex->value = 1;
     mutex->owner = RT_NULL;
@@ -771,7 +771,7 @@ rt_err_t rt_mutex_detach(rt_mutex_t mutex)
     RT_ASSERT(rt_object_is_systemobject(&mutex->parent.parent));
 
     /* wakeup all suspended threads */
-    rt_ipc_list_resume_all(&(mutex->parent.suspend_thread));
+    _ipc_list_resume_all(&(mutex->parent.suspend_thread));
 
     /* detach mutex object */
     rt_object_detach(&(mutex->parent.parent));
@@ -813,7 +813,7 @@ rt_mutex_t rt_mutex_create(const char *name, rt_uint8_t flag)
         return mutex;
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(mutex->parent));
+    _ipc_object_init(&(mutex->parent));
 
     mutex->value              = 1;
     mutex->owner              = RT_NULL;
@@ -856,7 +856,7 @@ rt_err_t rt_mutex_delete(rt_mutex_t mutex)
     RT_ASSERT(rt_object_is_systemobject(&mutex->parent.parent) == RT_FALSE);
 
     /* wakeup all suspended threads */
-    rt_ipc_list_resume_all(&(mutex->parent.suspend_thread));
+    _ipc_list_resume_all(&(mutex->parent.suspend_thread));
 
     /* delete mutex object */
     rt_object_delete(&(mutex->parent.parent));
@@ -985,7 +985,7 @@ __again:
                 }
 
                 /* suspend current thread */
-                rt_ipc_list_suspend(&(mutex->parent.suspend_thread),
+                _ipc_list_suspend(&(mutex->parent.suspend_thread),
                                     thread,
                                     mutex->parent.parent.flag);
 
@@ -1150,7 +1150,7 @@ rt_err_t rt_mutex_release(rt_mutex_t mutex)
             }
 
             /* resume thread */
-            rt_ipc_list_resume(&(mutex->parent.suspend_thread));
+            _ipc_list_resume(&(mutex->parent.suspend_thread));
 
             need_schedule = RT_TRUE;
         }
@@ -1269,7 +1269,7 @@ rt_err_t rt_event_init(rt_event_t event, const char *name, rt_uint8_t flag)
     event->parent.parent.flag = flag;
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(event->parent));
+    _ipc_object_init(&(event->parent));
 
     /* initialize event */
     event->set = 0;
@@ -1305,7 +1305,7 @@ rt_err_t rt_event_detach(rt_event_t event)
     RT_ASSERT(rt_object_is_systemobject(&event->parent.parent));
 
     /* resume all suspended thread */
-    rt_ipc_list_resume_all(&(event->parent.suspend_thread));
+    _ipc_list_resume_all(&(event->parent.suspend_thread));
 
     /* detach event object */
     rt_object_detach(&(event->parent.parent));
@@ -1358,7 +1358,7 @@ rt_event_t rt_event_create(const char *name, rt_uint8_t flag)
     event->parent.parent.flag = flag;
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(event->parent));
+    _ipc_object_init(&(event->parent));
 
     /* initialize event */
     event->set = 0;
@@ -1396,7 +1396,7 @@ rt_err_t rt_event_delete(rt_event_t event)
     RT_DEBUG_NOT_IN_INTERRUPT;
 
     /* resume all suspended thread */
-    rt_ipc_list_resume_all(&(event->parent.suspend_thread));
+    _ipc_list_resume_all(&(event->parent.suspend_thread));
 
     /* delete event object */
     rt_object_delete(&(event->parent.parent));
@@ -1628,7 +1628,7 @@ rt_err_t rt_event_recv(rt_event_t   event,
         thread->event_info = option;
 
         /* put thread to suspended thread list */
-        rt_ipc_list_suspend(&(event->parent.suspend_thread),
+        _ipc_list_suspend(&(event->parent.suspend_thread),
                             thread,
                             event->parent.parent.flag);
 
@@ -1700,7 +1700,7 @@ rt_err_t rt_event_control(rt_event_t event, int cmd, void *arg)
         level = rt_hw_interrupt_disable();
 
         /* resume all waiting thread */
-        rt_ipc_list_resume_all(&event->parent.suspend_thread);
+        _ipc_list_resume_all(&event->parent.suspend_thread);
 
         /* initialize event set */
         event->set = 0;
@@ -1781,7 +1781,7 @@ rt_err_t rt_mb_init(rt_mailbox_t mb,
     mb->parent.parent.flag = flag;
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(mb->parent));
+    _ipc_object_init(&(mb->parent));
 
     /* initialize mailbox */
     mb->msg_pool   = (rt_ubase_t *)msgpool;
@@ -1824,9 +1824,9 @@ rt_err_t rt_mb_detach(rt_mailbox_t mb)
     RT_ASSERT(rt_object_is_systemobject(&mb->parent.parent));
 
     /* resume all suspended thread */
-    rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
+    _ipc_list_resume_all(&(mb->parent.suspend_thread));
     /* also resume all mailbox private suspended thread */
-    rt_ipc_list_resume_all(&(mb->suspend_sender_thread));
+    _ipc_list_resume_all(&(mb->suspend_sender_thread));
 
     /* detach mailbox object */
     rt_object_detach(&(mb->parent.parent));
@@ -1882,7 +1882,7 @@ rt_mailbox_t rt_mb_create(const char *name, rt_size_t size, rt_uint8_t flag)
     mb->parent.parent.flag = flag;
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(mb->parent));
+    _ipc_object_init(&(mb->parent));
 
     /* initialize mailbox */
     mb->size     = size;
@@ -1934,10 +1934,10 @@ rt_err_t rt_mb_delete(rt_mailbox_t mb)
     RT_ASSERT(rt_object_is_systemobject(&mb->parent.parent) == RT_FALSE);
 
     /* resume all suspended thread */
-    rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
+    _ipc_list_resume_all(&(mb->parent.suspend_thread));
 
     /* also resume all mailbox private suspended thread */
-    rt_ipc_list_resume_all(&(mb->suspend_sender_thread));
+    _ipc_list_resume_all(&(mb->suspend_sender_thread));
 
     /* free mailbox pool */
     RT_KERNEL_FREE(mb->msg_pool);
@@ -2020,7 +2020,7 @@ rt_err_t rt_mb_send_wait(rt_mailbox_t mb,
 
         RT_DEBUG_IN_THREAD_CONTEXT;
         /* suspend current thread */
-        rt_ipc_list_suspend(&(mb->suspend_sender_thread),
+        _ipc_list_suspend(&(mb->suspend_sender_thread),
                             thread,
                             mb->parent.parent.flag);
 
@@ -2087,7 +2087,7 @@ rt_err_t rt_mb_send_wait(rt_mailbox_t mb,
     /* resume suspended thread */
     if (!rt_list_isempty(&mb->parent.suspend_thread))
     {
-        rt_ipc_list_resume(&(mb->parent.suspend_thread));
+        _ipc_list_resume(&(mb->parent.suspend_thread));
 
         /* enable interrupt */
         rt_hw_interrupt_enable(temp);
@@ -2183,7 +2183,7 @@ rt_err_t rt_mb_urgent(rt_mailbox_t mb, rt_ubase_t value)
     /* resume suspended thread */
     if (!rt_list_isempty(&mb->parent.suspend_thread))
     {
-        rt_ipc_list_resume(&(mb->parent.suspend_thread));
+        _ipc_list_resume(&(mb->parent.suspend_thread));
 
         /* enable interrupt */
         rt_hw_interrupt_enable(temp);
@@ -2266,7 +2266,7 @@ rt_err_t rt_mb_recv(rt_mailbox_t mb, rt_ubase_t *value, rt_int32_t timeout)
 
         RT_DEBUG_IN_THREAD_CONTEXT;
         /* suspend current thread */
-        rt_ipc_list_suspend(&(mb->parent.suspend_thread),
+        _ipc_list_suspend(&(mb->parent.suspend_thread),
                             thread,
                             mb->parent.parent.flag);
 
@@ -2329,7 +2329,7 @@ rt_err_t rt_mb_recv(rt_mailbox_t mb, rt_ubase_t *value, rt_int32_t timeout)
     /* resume suspended thread */
     if (!rt_list_isempty(&(mb->suspend_sender_thread)))
     {
-        rt_ipc_list_resume(&(mb->suspend_sender_thread));
+        _ipc_list_resume(&(mb->suspend_sender_thread));
 
         /* enable interrupt */
         rt_hw_interrupt_enable(temp);
@@ -2379,9 +2379,9 @@ rt_err_t rt_mb_control(rt_mailbox_t mb, int cmd, void *arg)
         level = rt_hw_interrupt_disable();
 
         /* resume all waiting thread */
-        rt_ipc_list_resume_all(&(mb->parent.suspend_thread));
+        _ipc_list_resume_all(&(mb->parent.suspend_thread));
         /* also resume all mailbox private suspended thread */
-        rt_ipc_list_resume_all(&(mb->suspend_sender_thread));
+        _ipc_list_resume_all(&(mb->suspend_sender_thread));
 
         /* re-init mailbox */
         mb->entry      = 0;
@@ -2478,7 +2478,7 @@ rt_err_t rt_mq_init(rt_mq_t     mq,
     mq->parent.parent.flag = flag;
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(mq->parent));
+    _ipc_object_init(&(mq->parent));
 
     /* set message pool */
     mq->msg_pool = msgpool;
@@ -2538,9 +2538,9 @@ rt_err_t rt_mq_detach(rt_mq_t mq)
     RT_ASSERT(rt_object_is_systemobject(&mq->parent.parent));
 
     /* resume all suspended thread */
-    rt_ipc_list_resume_all(&mq->parent.suspend_thread);
+    _ipc_list_resume_all(&mq->parent.suspend_thread);
     /* also resume all message queue private suspended thread */
-    rt_ipc_list_resume_all(&(mq->suspend_sender_thread));
+    _ipc_list_resume_all(&(mq->suspend_sender_thread));
 
     /* detach message queue object */
     rt_object_detach(&(mq->parent.parent));
@@ -2602,7 +2602,7 @@ rt_mq_t rt_mq_create(const char *name,
     mq->parent.parent.flag = flag;
 
     /* initialize ipc object */
-    rt_ipc_object_init(&(mq->parent));
+    _ipc_object_init(&(mq->parent));
 
     /* initialize message queue */
 
@@ -2673,9 +2673,9 @@ rt_err_t rt_mq_delete(rt_mq_t mq)
     RT_ASSERT(rt_object_is_systemobject(&mq->parent.parent) == RT_FALSE);
 
     /* resume all suspended thread */
-    rt_ipc_list_resume_all(&(mq->parent.suspend_thread));
+    _ipc_list_resume_all(&(mq->parent.suspend_thread));
     /* also resume all message queue private suspended thread */
-    rt_ipc_list_resume_all(&(mq->suspend_sender_thread));
+    _ipc_list_resume_all(&(mq->suspend_sender_thread));
 
     /* free message queue pool */
     RT_KERNEL_FREE(mq->msg_pool);
@@ -2776,7 +2776,7 @@ rt_err_t rt_mq_send_wait(rt_mq_t     mq,
 
         RT_DEBUG_IN_THREAD_CONTEXT;
         /* suspend current thread */
-        rt_ipc_list_suspend(&(mq->suspend_sender_thread),
+        _ipc_list_suspend(&(mq->suspend_sender_thread),
                             thread,
                             mq->parent.parent.flag);
 
@@ -2862,7 +2862,7 @@ rt_err_t rt_mq_send_wait(rt_mq_t     mq,
     /* resume suspended thread */
     if (!rt_list_isempty(&mq->parent.suspend_thread))
     {
-        rt_ipc_list_resume(&(mq->parent.suspend_thread));
+        _ipc_list_resume(&(mq->parent.suspend_thread));
 
         /* enable interrupt */
         rt_hw_interrupt_enable(temp);
@@ -2991,7 +2991,7 @@ rt_err_t rt_mq_urgent(rt_mq_t mq, const void *buffer, rt_size_t size)
     /* resume suspended thread */
     if (!rt_list_isempty(&mq->parent.suspend_thread))
     {
-        rt_ipc_list_resume(&(mq->parent.suspend_thread));
+        _ipc_list_resume(&(mq->parent.suspend_thread));
 
         /* enable interrupt */
         rt_hw_interrupt_enable(temp);
@@ -3081,7 +3081,7 @@ rt_err_t rt_mq_recv(rt_mq_t    mq,
         }
 
         /* suspend current thread */
-        rt_ipc_list_suspend(&(mq->parent.suspend_thread),
+        _ipc_list_suspend(&(mq->parent.suspend_thread),
                             thread,
                             mq->parent.parent.flag);
 
@@ -3157,7 +3157,7 @@ rt_err_t rt_mq_recv(rt_mq_t    mq,
     /* resume suspended thread */
     if (!rt_list_isempty(&(mq->suspend_sender_thread)))
     {
-        rt_ipc_list_resume(&(mq->suspend_sender_thread));
+        _ipc_list_resume(&(mq->suspend_sender_thread));
 
         /* enable interrupt */
         rt_hw_interrupt_enable(temp);
@@ -3208,9 +3208,9 @@ rt_err_t rt_mq_control(rt_mq_t mq, int cmd, void *arg)
         level = rt_hw_interrupt_disable();
 
         /* resume all waiting thread */
-        rt_ipc_list_resume_all(&mq->parent.suspend_thread);
+        _ipc_list_resume_all(&mq->parent.suspend_thread);
         /* also resume all message queue private suspended thread */
-        rt_ipc_list_resume_all(&(mq->suspend_sender_thread));
+        _ipc_list_resume_all(&(mq->suspend_sender_thread));
 
         /* release all message in the queue */
         while (mq->msg_queue_head != RT_NULL)
diff --git a/src/scheduler.c b/src/scheduler.c
index 353fdad5cb..bb431e2efe 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -23,7 +23,7 @@
  * 2013-12-21     Grissiom     add rt_critical_level
  * 2018-11-22     Jesven       remove the current task from ready queue
  *                             add per cpu ready queue
- *                             add _get_highest_priority_thread to find highest priority task
+ *                             add _scheduler_get_highest_priority_thread to find highest priority task
  *                             rt_schedule_insert_thread won't insert current task to ready queue
  *                             in smp version, rt_hw_context_switch_interrupt maybe switch to
  *                               new task directly
@@ -119,7 +119,7 @@ static void _rt_scheduler_stack_check(struct rt_thread *thread)
  * get the highest priority thread in ready queue
  */
 #ifdef RT_USING_SMP
-static struct rt_thread* _get_highest_priority_thread(rt_ubase_t *highest_prio)
+static struct rt_thread* _scheduler_get_highest_priority_thread(rt_ubase_t *highest_prio)
 {
     register struct rt_thread *highest_priority_thread;
     register rt_ubase_t highest_ready_priority, local_highest_ready_priority;
@@ -155,7 +155,7 @@ static struct rt_thread* _get_highest_priority_thread(rt_ubase_t *highest_prio)
     return highest_priority_thread;
 }
 #else
-static struct rt_thread* _get_highest_priority_thread(rt_ubase_t *highest_prio)
+static struct rt_thread* _scheduler_get_highest_priority_thread(rt_ubase_t *highest_prio)
 {
     register struct rt_thread *highest_priority_thread;
     register rt_ubase_t highest_ready_priority;
@@ -241,7 +241,7 @@ void rt_system_scheduler_start(void)
     register struct rt_thread *to_thread;
     rt_ubase_t highest_ready_priority;
 
-    to_thread = _get_highest_priority_thread(&highest_ready_priority);
+    to_thread = _scheduler_get_highest_priority_thread(&highest_ready_priority);
 
 #ifdef RT_USING_SMP
     to_thread->oncpu = rt_hw_cpu_id();
@@ -329,7 +329,7 @@ void rt_schedule(void)
 
         if (rt_thread_ready_priority_group != 0 || pcpu->priority_group != 0)
         {
-            to_thread = _get_highest_priority_thread(&highest_ready_priority);
+            to_thread = _scheduler_get_highest_priority_thread(&highest_ready_priority);
             current_thread->oncpu = RT_CPU_DETACHED;
             if ((current_thread->stat & RT_THREAD_STAT_MASK) == RT_THREAD_RUNNING)
             {
@@ -429,7 +429,7 @@ void rt_schedule(void)
             /* need_insert_from_thread: need to insert from_thread to ready queue */
             int need_insert_from_thread = 0;
 
-            to_thread = _get_highest_priority_thread(&highest_ready_priority);
+            to_thread = _scheduler_get_highest_priority_thread(&highest_ready_priority);
 
             if ((rt_current_thread->stat & RT_THREAD_STAT_MASK) == RT_THREAD_RUNNING)
             {
@@ -582,7 +582,7 @@ void rt_scheduler_do_irq_switch(void *context)
 
         if (rt_thread_ready_priority_group != 0 || pcpu->priority_group != 0)
         {
-            to_thread = _get_highest_priority_thread(&highest_ready_priority);
+            to_thread = _scheduler_get_highest_priority_thread(&highest_ready_priority);
             current_thread->oncpu = RT_CPU_DETACHED;
             if ((current_thread->stat & RT_THREAD_STAT_MASK) == RT_THREAD_RUNNING)
             {