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      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:
     45         explicit LocalTerminationDisabler(ChildProcess& childProcess)
     46             : m_childProcess(childProcess)
     47         {
     48             m_childProcess.disableTermination();
     49         }
     50 
     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