1 /* 2 * Copyright (c) 2002, 2005, 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 // 26 // psTasks.hpp is a collection of GCTasks used by the 27 // parallelScavenge collector. 28 // 29 30 class GCTask; 31 class OopClosure; 32 class OopStack; 33 class ObjectStartArray; 34 class ParallelTaskTerminator; 35 class MutableSpace; 36 class PSOldGen; 37 class Thread; 38 class VMThread; 39 40 // 41 // ScavengeRootsTask 42 // 43 // This task scans all the roots of a given type. 44 // 45 // 46 47 class ScavengeRootsTask : public GCTask { 48 public: 49 enum RootType { 50 universe = 1, 51 jni_handles = 2, 52 threads = 3, 53 object_synchronizer = 4, 54 flat_profiler = 5, 55 system_dictionary = 6, 56 management = 7, 57 jvmti = 8, 58 code_cache = 9 59 }; 60 private: 61 RootType _root_type; 62 public: 63 ScavengeRootsTask(RootType value) : _root_type(value) {} 64 65 char* name() { return (char *)"scavenge-roots-task"; } 66 67 virtual void do_it(GCTaskManager* manager, uint which); 68 }; 69 70 // 71 // ThreadRootsTask 72 // 73 // This task scans the roots of a single thread. This task 74 // enables scanning of thread roots in parallel. 75 // 76 77 class ThreadRootsTask : public GCTask { 78 private: 79 JavaThread* _java_thread; 80 VMThread* _vm_thread; 81 public: 82 ThreadRootsTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {} 83 ThreadRootsTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {} 84 85 char* name() { return (char *)"thread-roots-task"; } 86 87 virtual void do_it(GCTaskManager* manager, uint which); 88 }; 89 90 // 91 // StealTask 92 // 93 // This task is used to distribute work to idle threads. 94 // 95 96 class StealTask : public GCTask { 97 private: 98 ParallelTaskTerminator* const _terminator; 99 public: 100 char* name() { return (char *)"steal-task"; } 101 102 StealTask(ParallelTaskTerminator* t); 103 104 ParallelTaskTerminator* terminator() { return _terminator; } 105 106 virtual void do_it(GCTaskManager* manager, uint which); 107 }; 108 109 // 110 // SerialOldToYoungRootsTask 111 // 112 // This task is used to scan for roots in the perm gen 113 114 class SerialOldToYoungRootsTask : public GCTask { 115 private: 116 PSOldGen* _gen; 117 HeapWord* _gen_top; 118 119 public: 120 SerialOldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top) : 121 _gen(gen), _gen_top(gen_top) { } 122 123 char* name() { return (char *)"serial-old-to-young-roots-task"; } 124 125 virtual void do_it(GCTaskManager* manager, uint which); 126 }; 127 128 // 129 // OldToYoungRootsTask 130 // 131 // This task is used to scan old to young roots in parallel 132 133 class OldToYoungRootsTask : public GCTask { 134 private: 135 PSOldGen* _gen; 136 HeapWord* _gen_top; 137 uint _stripe_number; 138 139 public: 140 OldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top, uint stripe_number) : 141 _gen(gen), _gen_top(gen_top), _stripe_number(stripe_number) { } 142 143 char* name() { return (char *)"old-to-young-roots-task"; } 144 145 virtual void do_it(GCTaskManager* manager, uint which); 146 };