From e600b4eb22e7d27d5211c427d39d39ef5eeae8a0 Mon Sep 17 00:00:00 2001
From: yeom <yeom>
Date: Sat, 13 Nov 2010 04:07:38 +0000
Subject: [PATCH] removes unnecessary LOCKXCHG operation to optimize.

---
 Robust/src/Runtime/squeue.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Robust/src/Runtime/squeue.h b/Robust/src/Runtime/squeue.h
index ec30fd74..b67f3b92 100644
--- a/Robust/src/Runtime/squeue.h
+++ b/Robust/src/Runtime/squeue.h
@@ -148,7 +148,8 @@ static inline void* dqPopTop(deque *p) {
     return item;
   } else {
     void * item=NULL;
-    item=(void *) LOCKXCHG((unsigned INTPTR*) &(realptr->work), (unsigned INTPTR) item);
+    if (realptr->work!=NULL)
+      item=(void *) LOCKXCHG((unsigned INTPTR*) &(realptr->work), (unsigned INTPTR) item);
     return item;
   }
 }
-- 
2.34.1