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1 /*
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2 * Copyright 2002-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 //
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26 // psTasks.hpp is a collection of GCTasks used by the
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27 // parallelScavenge collector.
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28 //
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29
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30 class GCTask;
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31 class OopClosure;
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32 class OopStack;
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33 class ObjectStartArray;
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34 class ParallelTaskTerminator;
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35 class MutableSpace;
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36 class PSOldGen;
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37 class Thread;
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38 class VMThread;
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39
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40 //
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41 // ScavengeRootsTask
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42 //
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43 // This task scans all the roots of a given type.
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44 //
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45 //
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46
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47 class ScavengeRootsTask : public GCTask {
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48 public:
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49 enum RootType {
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50 universe = 1,
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51 jni_handles = 2,
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52 threads = 3,
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53 object_synchronizer = 4,
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54 flat_profiler = 5,
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55 system_dictionary = 6,
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56 management = 7,
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57 jvmti = 8
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58 };
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59 private:
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60 RootType _root_type;
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61 public:
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62 ScavengeRootsTask(RootType value) : _root_type(value) {}
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63
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64 char* name() { return (char *)"scavenge-roots-task"; }
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65
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66 virtual void do_it(GCTaskManager* manager, uint which);
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67 };
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68
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69 //
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70 // ThreadRootsTask
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71 //
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72 // This task scans the roots of a single thread. This task
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73 // enables scanning of thread roots in parallel.
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74 //
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75
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76 class ThreadRootsTask : public GCTask {
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77 private:
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78 JavaThread* _java_thread;
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79 VMThread* _vm_thread;
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80 public:
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81 ThreadRootsTask(JavaThread* root) : _java_thread(root), _vm_thread(NULL) {}
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82 ThreadRootsTask(VMThread* root) : _java_thread(NULL), _vm_thread(root) {}
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83
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84 char* name() { return (char *)"thread-roots-task"; }
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85
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86 virtual void do_it(GCTaskManager* manager, uint which);
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87 };
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88
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89 //
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90 // StealTask
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91 //
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92 // This task is used to distribute work to idle threads.
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93 //
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94
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95 class StealTask : public GCTask {
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96 private:
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97 ParallelTaskTerminator* const _terminator;
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98 public:
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99 char* name() { return (char *)"steal-task"; }
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100
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101 StealTask(ParallelTaskTerminator* t);
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102
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103 ParallelTaskTerminator* terminator() { return _terminator; }
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104
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105 virtual void do_it(GCTaskManager* manager, uint which);
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106 };
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107
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108 //
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109 // SerialOldToYoungRootsTask
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110 //
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111 // This task is used to scan for roots in the perm gen
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112
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113 class SerialOldToYoungRootsTask : public GCTask {
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114 private:
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115 PSOldGen* _gen;
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116 HeapWord* _gen_top;
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117
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118 public:
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119 SerialOldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top) :
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120 _gen(gen), _gen_top(gen_top) { }
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121
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122 char* name() { return (char *)"serial-old-to-young-roots-task"; }
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123
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124 virtual void do_it(GCTaskManager* manager, uint which);
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125 };
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126
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127 //
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128 // OldToYoungRootsTask
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129 //
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130 // This task is used to scan old to young roots in parallel
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131
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132 class OldToYoungRootsTask : public GCTask {
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133 private:
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134 PSOldGen* _gen;
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135 HeapWord* _gen_top;
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136 uint _stripe_number;
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137
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138 public:
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139 OldToYoungRootsTask(PSOldGen *gen, HeapWord* gen_top, uint stripe_number) :
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140 _gen(gen), _gen_top(gen_top), _stripe_number(stripe_number) { }
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141
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142 char* name() { return (char *)"old-to-young-roots-task"; }
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143
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144 virtual void do_it(GCTaskManager* manager, uint which);
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145 };
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