From 07d2ace8b4771e2ad48d4a9e6bf43a2022a25fac Mon Sep 17 00:00:00 2001
From: Joe Zhao <ztuowen@gmail.com>
Date: Fri, 23 May 2014 15:36:51 +0800
Subject: Added SYSSTOP & MSTATE macro New example main.c

---
 rs422lib/sysctl.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'rs422lib/sysctl.c')

diff --git a/rs422lib/sysctl.c b/rs422lib/sysctl.c
index cafcb62..ea05587 100644
--- a/rs422lib/sysctl.c
+++ b/rs422lib/sysctl.c
@@ -19,8 +19,11 @@ void sysctl_void()
 }
 
 void sysroutine()
+// << Drawback: interrupt may happen between else and CPUOFF
+//		Critical section -> unlikely to have a race condition
 {
-	if (syscall>0)
+	if (!syscall)
+		_BIS_SR(CPUOFF);
 	switch ((syscall & (-syscall))) // This is used to get the lowest bit
 	{
 	case SYS_BIT7:
@@ -56,8 +59,7 @@ void sysroutine()
 		sysarr[0]();
 		break;
 	}
-	else
-		_BIS_SR(CPUOFF);
+
 }
 
 inline int sys_b2i(int bit)
-- 
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