update

src/ipc.c

@@ -1534,7 +1534,6 @@ rt_err_t rt_mb_send_wait(rt_mailbox_t mb,
     if (mb->entry == mb->size && timeout == 0)
     {
         rt_hw_interrupt_enable(temp);
-
         return -RT_EFULL;
     }
 
@@ -1678,6 +1677,12 @@ rt_err_t rt_mb_urgent(rt_mailbox_t mb, rt_ubase_t value)
     /* disable interrupt */
     temp = rt_hw_interrupt_disable();
 
+    if (mb->entry == mb->size)
+    {
+        rt_hw_interrupt_enable(temp);
+        return -RT_EFULL;
+    }
+
     /* rewind to the previous position */
     if (mb->out_offset > 0)
     {