[Kernel] message 可以返回消息的实际大小 (#7709)

2 files changed, 3 insertions, 3 deletions

diff --git a/documentation/device/uart/uart.md b/documentation/device/uart/uart.md
index d49a005019..92ca9b4bf8 100644
--- a/documentation/device/uart/uart.md
+++ b/documentation/device/uart/uart.md
@@ -575,7 +575,7 @@ static void serial_thread_entry(void *parameter)
         rt_memset(&msg, 0, sizeof(msg));
         /* Read messages from the message queue*/
         result = rt_mq_recv(&rx_mq, &msg, sizeof(msg), RT_WAITING_FOREVER);
-        if (result == RT_EOK)
+        if (result >= 0)
         {
             /*Read data from the serial port*/
             rx_length = rt_device_read(msg.dev, 0, rx_buffer, msg.size);
diff --git a/documentation/thread-comm/thread-comm.md b/documentation/thread-comm/thread-comm.md
index 4369752855..758c8defa5 100644
--- a/documentation/thread-comm/thread-comm.md
+++ b/documentation/thread-comm/thread-comm.md
@@ -595,7 +595,7 @@ static void thread1_entry(void *parameter)
     while (1)
     {
         /* Receive messages from the message queue */
-        if (rt_mq_recv(&mq, &buf, sizeof(buf), RT_WAITING_FOREVER) == RT_EOK)
+        if (rt_mq_recv(&mq, &buf, sizeof(buf), RT_WAITING_FOREVER) >= 0)
         {
             rt_kprintf("thread1: recv msg from msg queue, the content:%c\n", buf);
             if (cnt == 19)
@@ -784,7 +784,7 @@ void message_handler()
     struct msg msg_ptr; /* Local variable used to place the message */
 
     /* Receive messages from the message queue into msg_ptr */
-    if (rt_mq_recv(mq, (void*)&msg_ptr, sizeof(struct msg)) == RT_EOK)
+    if (rt_mq_recv(mq, (void*)&msg_ptr, sizeof(struct msg)) >= 0)
     {
         /* Successfully received the message, corresponding data processing is performed */
     }