From a78c6bedea2bb4e9833fdb2cc22f3af813724609 Mon Sep 17 00:00:00 2001
From: chenchaoqun <chenchaoqun@rt-thread.com>
Date: Mon, 27 Jul 2020 14:01:30 +0800
Subject: [PATCH] [add] a macro to be isolated while using signals in
 rt_mutex_take function.

---
 src/ipc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ipc.c b/src/ipc.c
index 8e8c4db842..b0efdd1320 100644
--- a/src/ipc.c
+++ b/src/ipc.c
@@ -685,7 +685,9 @@ rt_err_t rt_mutex_take(rt_mutex_t mutex, rt_int32_t time)
     }
     else
     {
+#ifdef RT_USING_SIGNALS
 __again:
+#endif /* end of RT_USING_SIGNALS */
         /* The value of mutex is 1 in initial status. Therefore, if the
          * value is great than 0, it indicates the mutex is avaible.
          */
@@ -754,8 +756,10 @@ __again:
 
                 if (thread->error != RT_EOK)
                 {
+#ifdef RT_USING_SIGNALS
                     /* interrupt by signal, try it again */
                     if (thread->error == -RT_EINTR) goto __again;
+#endif /* end of RT_USING_SIGNALS */
 
                     /* return error */
                     return thread->error;