Mercurial > hg > truffle
annotate agent/src/os/win32/Reaper.hpp @ 3917:eca1193ca245
4965777: GC changes to support use of discovered field for pending references
Summary: If and when the reference handler thread is able to use the discovered field to link reference objects in its pending list, so will GC. In that case, GC will scan through this field once a reference object has been placed on the pending list, but not scan that field before that stage, as the field is used by the concurrent GC thread to link discovered objects. When ReferenceHandleR thread does not use the discovered field for the purpose of linking the elements in the pending list, as would be the case in older JDKs, the JVM will fall back to the old behaviour of using the next field for that purpose.
Reviewed-by: jcoomes, mchung, stefank
| author | ysr |
|---|---|
| date | Wed, 07 Sep 2011 13:55:42 -0700 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
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| 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 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_ |