CcTest::isolate_used_ is used from multiple threads, make it atomic

test/cctest/cctest.cc

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 29 matching lines @@
 #include <crtdbg.h>
 #endif  // defined(_MSC_VER)
 #endif  // defined(_WIN32) || defined(_WIN64)
 
 enum InitializationState {kUnset, kUnintialized, kInitialized};
 static InitializationState initialization_state_  = kUnset;
 static bool disable_automatic_dispose_ = false;
 
 CcTest* CcTest::last_ = NULL;
 bool CcTest::initialize_called_ = false;
-bool CcTest::isolate_used_ = false;
+v8::base::Atomic32 CcTest::isolate_used_ = 0;
 v8::Isolate* CcTest::isolate_ = NULL;
 
 
 CcTest::CcTest(TestFunction* callback, const char* file, const char* name,
                const char* dependency, bool enabled, bool initialize)
     : callback_(callback), name_(name), dependency_(dependency),
       enabled_(enabled), initialize_(initialize), prev_(last_) {
   // Find the base name of this test (const_cast required on Windows).
   char *basename = strrchr(const_cast<char *>(file), '/');
   if (!basename) {
@@ skipping 166 matching lines @@
   CcTest::TearDown();
   // TODO(svenpanne) See comment above.
   // if (!disable_automatic_dispose_) v8::V8::Dispose();
   v8::V8::ShutdownPlatform();
   delete platform;
   return 0;
 }
 
 RegisterThreadedTest *RegisterThreadedTest::first_ = NULL;
 int RegisterThreadedTest::count_ = 0;