Home | History | Annotate | Download | only in v8 
      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef WorkerScriptController_h
     32 #define WorkerScriptController_h
     33 
     34 #if ENABLE(WORKERS)
     35 
     36 #include <wtf/OwnPtr.h>
     37 #include <wtf/Threading.h>
     38 
     39 namespace WebCore {
     40 
     41     class ScriptSourceCode;
     42     class ScriptValue;
     43     class WorkerContext;
     44     class WorkerContextExecutionProxy;
     45 
     46     class WorkerScriptController {
     47     public:
     48         WorkerScriptController(WorkerContext*);
     49         ~WorkerScriptController();
     50 
     51         WorkerContextExecutionProxy* proxy() { return m_proxy.get(); }
     52         WorkerContext* workerContext() { return m_workerContext; }
     53 
     54         ScriptValue evaluate(const ScriptSourceCode&);
     55         ScriptValue evaluate(const ScriptSourceCode&, ScriptValue* exception);
     56 
     57         void setException(ScriptValue);
     58 
     59         // Async request to terminate a future JS execution. Eventually causes termination
     60         // exception raised during JS execution, if the worker thread happens to run JS.
     61         // After JS execution was terminated in this way, the Worker thread has to use
     62         // forbidExecution()/isExecutionForbidden() to guard against reentry into JS.
     63         // Can be called from any thread.
     64         void scheduleExecutionTermination();
     65 
     66         // Called on Worker thread when JS exits with termination exception caused by forbidExecution() request,
     67         // or by Worker thread termination code to prevent future entry into JS.
     68         void forbidExecution();
     69         bool isExecutionForbidden() const;
     70 
     71         // Returns WorkerScriptController for the currently executing context. 0 will be returned if the current executing context is not the worker context.
     72         static WorkerScriptController* controllerForContext();
     73 
     74     private:
     75         WorkerContext* m_workerContext;
     76         OwnPtr<WorkerContextExecutionProxy> m_proxy;
     77         bool m_executionForbidden;
     78     };
     79 
     80 } // namespace WebCore
     81 
     82 #endif // ENABLE(WORKERS)
     83 
     84 #endif // WorkerScriptController_h
     85