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comparison agent/src/os/win32/Reaper.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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_