From 789b508d538e6faf635e49f268a4f1f9e9b65f05 Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@nephron.lcs.mit.edu>
Date: Wed, 11 Aug 2010 14:34:45 -0400
Subject: uptime() sys call for benchmarking increase PHYSTOP

---
 sysproc.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

(limited to 'sysproc.c')

diff --git a/sysproc.c b/sysproc.c
index 11770ff..efaa372 100644
--- a/sysproc.c
+++ b/sysproc.c
@@ -57,7 +57,8 @@ sys_sbrk(void)
 int
 sys_sleep(void)
 {
-  int n, ticks0;
+  int n;
+  uint ticks0;
   
   if(argint(0, &n) < 0)
     return -1;
@@ -73,3 +74,16 @@ sys_sleep(void)
   release(&tickslock);
   return 0;
 }
+
+// return how many clock tick interrupts have occurred
+// since boot.
+int
+sys_uptime(void)
+{
+  uint xticks;
+  
+  acquire(&tickslock);
+  xticks = ticks;
+  release(&tickslock);
+  return xticks;
+}
-- 
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