diff --git a/components/dfs/src/dfs_file.c b/components/dfs/src/dfs_file.c
index 1063a278aba5459e8e72853d98c072088bcab688..91d39597f06d520096dc863754c21cbce1cd5233 100644
--- a/components/dfs/src/dfs_file.c
+++ b/components/dfs/src/dfs_file.c
@@ -369,8 +369,7 @@ int dfs_file_stat(const char *path, struct stat *buf)
 
     if ((fs = dfs_filesystem_lookup(fullpath)) == NULL)
     {
-        LOG_E(
-                "can't find mounted filesystem on this path:%s", fullpath);
+        LOG_E("can't find mounted filesystem on this path:%s", fullpath);
         rt_free(fullpath);
 
         return -ENOENT;
@@ -399,8 +398,7 @@ int dfs_file_stat(const char *path, struct stat *buf)
         if (fs->ops->stat == NULL)
         {
             rt_free(fullpath);
-            LOG_E(
-                    "the filesystem didn't implement this function");
+            LOG_E("the filesystem didn't implement this function");
 
             return -ENOSYS;
         }
@@ -565,7 +563,7 @@ void ls(const char *pathname)
                     }
                     else
                     {
-                        rt_kprintf("%-25lu\n", stat.st_size);
+                        rt_kprintf("%-25lu\n", (unsigned long)stat.st_size);
                     }
                 }
                 else
diff --git a/components/drivers/src/pipe.c b/components/drivers/src/pipe.c
index b682c351ad5d6cddf07ff36cbb18f9a9588de253..ae87b6f5f22e54e91d2b15cae957f713073a498f 100644
--- a/components/drivers/src/pipe.c
+++ b/components/drivers/src/pipe.c
@@ -19,6 +19,7 @@
 
 static int pipe_fops_open(struct dfs_fd *fd)
 {
+    int rc = 0;
     rt_device_t device;
     rt_pipe_t *pipe;
 
@@ -31,6 +32,11 @@ static int pipe_fops_open(struct dfs_fd *fd)
     if (device->ref_count == 0)
     {
         pipe->fifo = rt_ringbuffer_create(pipe->bufsz);
+        if (pipe->fifo == RT_NULL)
+        {
+            rc = -RT_ENOMEM;
+            goto __exit;
+        }
     }
 
     switch (fd->flags & O_ACCMODE)
@@ -48,9 +54,10 @@ static int pipe_fops_open(struct dfs_fd *fd)
     }
     device->ref_count ++;
 
+__exit:
     rt_mutex_release(&(pipe->lock));
 
-    return 0;
+    return rc;
 }
 
 static int pipe_fops_close(struct dfs_fd *fd)
@@ -90,7 +97,8 @@ static int pipe_fops_close(struct dfs_fd *fd)
 
     if (device->ref_count == 1)
     {
-        rt_ringbuffer_destroy(pipe->fifo);
+        if (pipe->fifo != RT_NULL)
+            rt_ringbuffer_destroy(pipe->fifo);
         pipe->fifo = RT_NULL;
     }
     device->ref_count --;
diff --git a/include/rtthread.h b/include/rtthread.h
index 13a1a4424bf47e5caf5a54543f3b7bfe315d3136..92cdf012b24b2875fd7874d4449bb8eb44f8c842 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -138,6 +138,7 @@ rt_err_t rt_thread_delete(rt_thread_t thread);
 
 rt_err_t rt_thread_yield(void);
 rt_err_t rt_thread_delay(rt_tick_t tick);
+rt_err_t rt_thread_delay_until(rt_tick_t *tick, rt_tick_t inc_tick);
 rt_err_t rt_thread_mdelay(rt_int32_t ms);
 rt_err_t rt_thread_control(rt_thread_t thread, int cmd, void *arg);
 rt_err_t rt_thread_suspend(rt_thread_t thread);
diff --git a/src/thread.c b/src/thread.c
index 7596906fae68de4996ce3729d63c2f221d8aa5cc..3a3c97d0b67d8aaecd5473ab1825dcd2461f2845 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -530,6 +530,63 @@ rt_err_t rt_thread_delay(rt_tick_t tick)
 }
 RTM_EXPORT(rt_thread_delay);
 
+/**
+ * This function will let current thread delay until (*tick + inc_tick).
+ *
+ * @param tick the tick of last wakeup.
+ * @param inc_tick the increment tick
+ *
+ * @return RT_EOK
+ */
+rt_err_t rt_thread_delay_until(rt_tick_t *tick, rt_tick_t inc_tick)
+{
+    register rt_base_t level;
+    struct rt_thread *thread;
+
+    RT_ASSERT(tick != RT_NULL);
+
+    /* set to current thread */
+    thread = rt_thread_self();
+    RT_ASSERT(thread != RT_NULL);
+    RT_ASSERT(rt_object_get_type((rt_object_t)thread) == RT_Object_Class_Thread);
+
+    /* disable interrupt */
+    level = rt_hw_interrupt_disable();
+
+    if (rt_tick_get() - *tick < inc_tick)
+    {
+        *tick = rt_tick_get() - *tick + inc_tick;
+
+        /* suspend thread */
+        rt_thread_suspend(thread);
+
+        /* reset the timeout of thread timer and start it */
+        rt_timer_control(&(thread->thread_timer), RT_TIMER_CTRL_SET_TIME, tick);
+        rt_timer_start(&(thread->thread_timer));
+
+        /* enable interrupt */
+        rt_hw_interrupt_enable(level);
+
+        rt_schedule();
+
+        /* clear error number of this thread to RT_EOK */
+        if (thread->error == -RT_ETIMEOUT)
+        {
+            thread->error = RT_EOK;
+        }
+    }
+    else
+    {
+        rt_hw_interrupt_enable(level);
+    }
+
+    /* get the wakeup tick */
+    *tick = rt_tick_get();
+
+    return RT_EOK;
+}
+RTM_EXPORT(rt_thread_delay_util);
+
 /**
  * This function will let current thread delay for some milliseconds.
  *