From 5bca14a33ee397e5d96ad1b26a62950b0db6ea33 Mon Sep 17 00:00:00 2001
From: "yangguo@chromium.org"
 <yangguo@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Tue, 18 Mar 2014 12:21:07 +0000
Subject: [PATCH] Fix race between VisitSmiRoots and SetStackLimit.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/198833006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20026 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 src/heap.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/heap.cc b/src/heap.cc
index 66b527456e..4855ac08ae 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -6161,6 +6161,8 @@ void Heap::IterateWeakRoots(ObjectVisitor* v, VisitMode mode) {
 
 
 void Heap::IterateSmiRoots(ObjectVisitor* v) {
+  // Acquire execution access since we are going to read stack limit values.
+  ExecutionAccess access(isolate());
   v->VisitPointers(&roots_[kSmiRootsStart], &roots_[kRootListLength]);
   v->Synchronize(VisitorSynchronization::kSmiRootList);
 }