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 proxy()51 WorkerContextExecutionProxy* proxy() { return m_proxy.get(); } workerContext()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