From 4087a6e7fc773ba4eb217dfc196dfe1eee84b25d Mon Sep 17 00:00:00 2001
From: Frans Kaashoek <kaashoek@mit.edu>
Date: Wed, 10 Aug 2022 20:35:42 -0400
Subject: Read and write p->killed using atomics

---
 kernel/sysproc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/sysproc.c')

diff --git a/kernel/sysproc.c b/kernel/sysproc.c
index e8bcda9..61b715b 100644
--- a/kernel/sysproc.c
+++ b/kernel/sysproc.c
@@ -63,7 +63,7 @@ sys_sleep(void)
   acquire(&tickslock);
   ticks0 = ticks;
   while(ticks - ticks0 < n){
-    if(myproc()->killed){
+    if(__sync_add_and_fetch(&(myproc()->killed), 0)){
       release(&tickslock);
       return -1;
     }
-- 
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