1 /* 2 * Copyright (C) 2010 Apple 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 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #ifndef ChildProcess_h 27 #define ChildProcess_h 28 29 #include "Connection.h" 30 #include "RunLoop.h" 31 32 namespace WebKit { 33 34 class ChildProcess : protected CoreIPC::Connection::Client { 35 WTF_MAKE_NONCOPYABLE(ChildProcess); 36 37 public: 38 // disable and enable termination of the process. when disableTermination is called, the 39 // process won't terminate unless a corresponding disableTermination call is made. 40 void disableTermination(); 41 void enableTermination(); 42 43 class LocalTerminationDisabler { 44 public: LocalTerminationDisabler(ChildProcess & childProcess)45 explicit LocalTerminationDisabler(ChildProcess& childProcess) 46 : m_childProcess(childProcess) 47 { 48 m_childProcess.disableTermination(); 49 } 50 ~LocalTerminationDisabler()51 ~LocalTerminationDisabler() 52 { 53 m_childProcess.enableTermination(); 54 } 55 56 private: 57 ChildProcess& m_childProcess; 58 }; 59 60 protected: 61 explicit ChildProcess(double terminationTimeout); 62 ~ChildProcess(); 63 64 static void didCloseOnConnectionWorkQueue(WorkQueue&, CoreIPC::Connection*); 65 66 private: 67 void terminationTimerFired(); 68 69 virtual bool shouldTerminate() = 0; 70 virtual void terminate(); 71 72 // The timeout, in seconds, before this process will be terminated if termination 73 // has been enabled. If the timeout is 0 seconds, the process will be terminated immediately. 74 double m_terminationTimeout; 75 76 // A termination counter; when the counter reaches zero, the process will be terminated 77 // after a given period of time. 78 unsigned m_terminationCounter; 79 80 RunLoop::Timer<ChildProcess> m_terminationTimer; 81 }; 82 83 } // namespace WebKit 84 85 #endif // ChildProcess_h 86