Fix race condition in test-thread-termination.

test/cctest/test-thread-termination.cc

 // Copyright 2009 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 237 matching lines @@
   {
     v8::Locker locker;
     for (int i = 0; i < kThreads; i++) {
       v8::V8::TerminateExecution(threads[i]->GetV8ThreadId());
     }
   }
   for (int i = 0; i < kThreads; i++) {
     threads[i]->Join();
     delete threads[i];
   }
+  {
+    v8::Locker locker;
+    v8::Locker::StopPreemption();
+  }
 
   delete semaphore;
   semaphore = NULL;
 }
 
 
 int call_count = 0;
 
 
 v8::Handle<v8::Value> TerminateOrReturnObject(const v8::Arguments& args) {
@@ skipping 94 matching lines @@
   v8::Handle<v8::String> source =
       v8::String::New("try { loop(); fail(); } catch(e) { fail(); }");
   v8::Script::Compile(source)->Run();
   CHECK(!v8::V8::IsExecutionTerminating());
   // Check we can run JS again after termination.
   CHECK(v8::Script::Compile(v8::String::New("function f() { return true; }"
                                             "f()"))->Run()->IsTrue());
   context.Dispose();
 }