1 /* 2 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef _REAPER_ 26 #define _REAPER_ 27 28 #include <vector> 29 #include <windows.h> 30 31 typedef void ReaperCB(void* userData); 32 33 /** A Reaper maintains a thread which waits for child processes to 34 terminate; upon termination it calls a user-specified ReaperCB to 35 clean up resources associated with those child processes. */ 36 37 class Reaper { 38 private: 39 Reaper& operator=(const Reaper&); 40 Reaper(const Reaper&); 41 42 public: 43 Reaper(ReaperCB*); 44 ~Reaper(); 45 46 // Start the reaper thread. 47 bool start(); 48 49 // Stop the reaper thread. This is called automatically in the 50 // reaper's destructor. It is not thread safe and should be called 51 // by at most one thread at a time. 52 bool stop(); 53 54 // Register a given child process with the reaper. This should be 55 // called by the application's main thread. When that process 56 // terminates, the cleanup callback will be called with the 57 // specified userData in the context of the reaper thread. Callbacks 58 // are guaranteed to be called serially, so they can safely refer to 59 // static data as well as the given user data. 60 void registerProcess(HANDLE processHandle, void* userData); 61 62 private: 63 // For thread safety of register() 64 CRITICAL_SECTION crit; 65 66 ReaperCB* cb; 67 68 // State variables 69 volatile bool active; 70 volatile bool shouldShutDown; 71 72 struct ProcessInfo { 73 HANDLE handle; 74 void* userData; 75 }; 76 77 // Bookkeeping 78 std::vector<ProcessInfo> procInfo; 79 80 // Synchronization between application thread and reaper thread 81 HANDLE event; 82 83 // Entry point for reaper thread 84 void reaperThread(); 85 86 // Static function which is actual thread entry point 87 static DWORD WINAPI reaperThreadEntry(LPVOID data); 88 }; 89 90 #endif // #defined _REAPER_