X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Fsynch.h;h=a19e88b181dff1208839ff890154aa69b299ce91;hb=8b801a69f8e0c2c4ef7e32a2476786f80f433b8e;hp=6b8f550e8798f6b9b916cf15ce8ec72861e283a8;hpb=f35d56069db7eb1bc09f48f7f40a594718611f95;p=pintos-anon

diff --git a/src/threads/synch.h b/src/threads/synch.h
index 6b8f550..a19e88b 100644
--- a/src/threads/synch.h
+++ b/src/threads/synch.h
@@ -44,7 +44,8 @@ void cond_broadcast (struct condition *, struct lock *);
 /* Optimization barrier.
 
    The compiler will not reorder operations across an
-   optimization barrier. */
-#define barrier() asm volatile ("")
+   optimization barrier.  See "Optimization Barriers" in the
+   reference guide for more information.*/
+#define barrier() asm volatile ("" : : : "memory")
 
 #endif /* threads/synch.h */