From 3755ac10b3a18192c3bddbe9649239402f5baa83 Mon Sep 17 00:00:00 2001
From: jjenista <jjenista>
Date: Tue, 9 Nov 2010 02:25:37 +0000
Subject: [PATCH] just an explanation of LOCKXCH

---
 Robust/src/Runtime/mlp_lock.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Robust/src/Runtime/mlp_lock.h b/Robust/src/Runtime/mlp_lock.h
index d462534b..46d8a930 100644
--- a/Robust/src/Runtime/mlp_lock.h
+++ b/Robust/src/Runtime/mlp_lock.h
@@ -61,6 +61,11 @@ static inline int LOCKXCHG32(volatile int* ptr, int val){
  
 }
 
+
+// LOCKXCH atomically does the following:
+// INTPTR retval=*ptr; 
+// *ptr=val; 
+// return retval
 #ifdef BIT64
 static inline INTPTR LOCKXCHG(volatile INTPTR * ptr, INTPTR val){
   INTPTR retval;
-- 
2.34.1