From 3d5e79248d284dd277f4c93126fc0f1a4ca0969e Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Tue, 29 Dec 2020 00:49:18 +0800
Subject: [kernel] 对IPC中减减进行摸排，防止出现减出一个很大的数
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---
 src/ipc.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/ipc.c b/src/ipc.c
index 454fcb5439..4261f617b0 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -1764,8 +1764,12 @@ rt_err_t rt_mb_recv(rt_mailbox_t mb, rt_ubase_t *value, rt_int32_t timeout)
     ++ mb->out_offset;
     if (mb->out_offset >= mb->size)
         mb->out_offset = 0;
+
     /* decrease message entry */
-    mb->entry --;
+    if(mb->entry > 0)
+    {
+        mb->entry --;
+    }
 
     /* resume suspended thread */
     if (!rt_list_isempty(&(mb->suspend_sender_thread)))
@@ -2439,7 +2443,10 @@ rt_err_t rt_mq_recv(rt_mq_t    mq,
         mq->msg_queue_tail = RT_NULL;
 
     /* decrease message entry */
-    mq->entry --;
+    if(mq->entry > 0)
+    {
+        mq->entry --;
+    }
 
     /* enable interrupt */
     rt_hw_interrupt_enable(temp);
-- 
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