1 /* 2 * Copyright (c) 2002, 2010, 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 SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP 27 28 #include "memory/allocation.hpp" 29 #include "utilities/growableArray.hpp" 30 31 // 32 // psTasks.hpp is a collection of GCTasks used by the 33 // parallelScavenge collector. 34 // 35 36 class GCTask; 37 class OopClosure; 38 class OopStack; 39 class ObjectStartArray; 40 class ParallelTaskTerminator; 41 class MutableSpace; 42 class PSOldGen; 43 class Thread; 44 class VMThread; 45 46 // 47 // ScavengeRootsTask 48 // 49 // This task scans all the roots of a given type. 50 // 51 // 52 53 class ScavengeRootsTask : public GCTask { 54 public: 55 enum RootType { 56 universe = 1, 57 jni_handles = 2, 58 threads = 3, 59 object_synchronizer = 4, 60 flat_profiler = 5, 61 system_dictionary = 6, 62 management = 7, 63 jvmti = 8, 64 code_cache = 9 65 }; 66 private: 67 RootType _root_type; 68 public: 69 ScavengeRootsTask(RootType value) : _root_type(value) {} 70 71 char* name() { return (char *)"scavenge-roots-task"; } 72 73 virtual void do_it(GCTaskManager* manager, uint which); 74 }; 75 76 // 77 // ThreadRootsTask 78 // 79 // This task scans the roots of a single thread. This task 80 // enables scanning of thread roots in parallel. 81 // 82 83 class ThreadRootsTask : public GCTask { 84 private: 85 JavaThread* _java_thread; 86 VMThread* _vm_thread; 87 public: 88 ThreadRootsTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {} 89 ThreadRootsTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {} 90 91 char* name() { return (char *)"thread-roots-task"; } 92 93 virtual void do_it(GCTaskManager* manager, uint which); 94 }; 95 96 // 97 // StealTask 98 // 99 // This task is used to distribute work to idle threads. 100 // 101 102 class StealTask : public GCTask { 103 private: 104 ParallelTaskTerminator* const _terminator; 105 public: 106 char* name() { return (char *)"steal-task"; } 107 108 StealTask(ParallelTaskTerminator* t); 109 110 ParallelTaskTerminator* terminator() { return _terminator; } 111 112 virtual void do_it(GCTaskManager* manager, uint which); 113 }; 114 115 // 116 // SerialOldToYoungRootsTask 117 // 118 // This task is used to scan for roots in the perm gen 119 120 class SerialOldToYoungRootsTask : public GCTask { 121 private: 122 PSOldGen* _gen; 123 HeapWord* _gen_top; 124 125 public: 126 SerialOldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top) : 127 _gen(gen), _gen_top(gen_top) { } 128 129 char* name() { return (char *)"serial-old-to-young-roots-task"; } 130 131 virtual void do_it(GCTaskManager* manager, uint which); 132 }; 133 134 // 135 // OldToYoungRootsTask 136 // 137 // This task is used to scan old to young roots in parallel 138 139 class OldToYoungRootsTask : public GCTask { 140 private: 141 PSOldGen* _gen; 142 HeapWord* _gen_top; 143 uint _stripe_number; 144 145 public: 146 OldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top, uint stripe_number) : 147 _gen(gen), _gen_top(gen_top), _stripe_number(stripe_number) { } 148 149 char* name() { return (char *)"old-to-young-roots-task"; } 150 151 virtual void do_it(GCTaskManager* manager, uint which); 152 }; 153 154 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSTASKS_HPP