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1 /*
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2 * Copyright 2000 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 #ifndef _REAPER_
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26 #define _REAPER_
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27
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28 #include <vector>
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29 #include <windows.h>
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30
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31 typedef void ReaperCB(void* userData);
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32
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33 /** A Reaper maintains a thread which waits for child processes to
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34 terminate; upon termination it calls a user-specified ReaperCB to
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35 clean up resources associated with those child processes. */
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36
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37 class Reaper {
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38 private:
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39 Reaper& operator=(const Reaper&);
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40 Reaper(const Reaper&);
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41
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42 public:
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43 Reaper(ReaperCB*);
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44 ~Reaper();
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45
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46 // Start the reaper thread.
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47 bool start();
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48
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49 // Stop the reaper thread. This is called automatically in the
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50 // reaper's destructor. It is not thread safe and should be called
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51 // by at most one thread at a time.
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52 bool stop();
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53
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54 // Register a given child process with the reaper. This should be
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55 // called by the application's main thread. When that process
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56 // terminates, the cleanup callback will be called with the
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57 // specified userData in the context of the reaper thread. Callbacks
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58 // are guaranteed to be called serially, so they can safely refer to
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59 // static data as well as the given user data.
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60 void registerProcess(HANDLE processHandle, void* userData);
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61
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62 private:
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63 // For thread safety of register()
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64 CRITICAL_SECTION crit;
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65
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66 ReaperCB* cb;
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67
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68 // State variables
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69 volatile bool active;
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70 volatile bool shouldShutDown;
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71
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72 struct ProcessInfo {
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73 HANDLE handle;
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74 void* userData;
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75 };
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76
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77 // Bookkeeping
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78 std::vector<ProcessInfo> procInfo;
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79
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80 // Synchronization between application thread and reaper thread
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81 HANDLE event;
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82
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83 // Entry point for reaper thread
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84 void reaperThread();
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85
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86 // Static function which is actual thread entry point
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87 static DWORD WINAPI reaperThreadEntry(LPVOID data);
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88 };
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89
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90 #endif // #defined _REAPER_
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