Don't be so CRASH happy in the bindings layer.

WebCore/bindings/v8/WorkerScriptController.cpp

 /*
- * Copyright (C) 2009 Google Inc. All rights reserved.
+ * Copyright (C) 2012 Google Inc. 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 with the
@@ skipping 33 matching lines @@
 #include "WorkerObjectProxy.h"
 #include "WorkerThread.h"
 #include <v8.h>
 
 namespace WebCore {
 
 WorkerScriptController::WorkerScriptController(WorkerContext* workerContext)
     : m_workerContext(workerContext)
     , m_isolate(v8::Isolate::New())
     , m_executionForbidden(false)
+    , m_executionScheduledToTerminate(false)
 {
     V8BindingPerIsolateData* data = V8BindingPerIsolateData::create(m_isolate);
     data->allStores().append(&m_DOMDataStore);
     data->setDOMDataStore(&m_DOMDataStore);
     m_isolate->Enter();
     m_proxy = adoptPtr(new WorkerContextExecutionProxy(workerContext));
 }
 
 WorkerScriptController::~WorkerScriptController()
 {
@@ skipping 19 matching lines @@
     if (state.hadException) {
         if (exception)
             *exception = state.exception;
         else
             m_workerContext->reportException(state.errorMessage, state.lineNumber, state.sourceURL, 0);
     }
 }
 
 void WorkerScriptController::scheduleExecutionTermination()
 {
+    {
+        MutexLocker locker(m_scheduledTerminationMutex);
+        m_executionScheduledToTerminate = true;
+    }
     v8::V8::TerminateExecution(m_isolate);
 }
 
+bool WorkerScriptController::isExecutionTerminating() const
+{
+    MutexLocker locker(m_scheduledTerminationMutex);
+    return m_executionScheduledToTerminate;
+}
+
 void WorkerScriptController::forbidExecution()
 {
     ASSERT(m_workerContext->isContextThread());
     m_executionForbidden = true;
 }
 
 bool WorkerScriptController::isExecutionForbidden() const
 {
     ASSERT(m_workerContext->isContextThread());
     return m_executionForbidden;
@@ skipping 19 matching lines @@
     // Return 0 if the current executing context is not the worker context.
     if (global.IsEmpty())
         return 0;
     WorkerContext* workerContext = V8WorkerContext::toNative(global);
     return workerContext->script();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WORKERS)