Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/ptrQueue.hpp @ 993:54b3b351d6f9
Merge
| author | jrose |
|---|---|
| date | Wed, 23 Sep 2009 23:56:15 -0700 |
| parents | 7bb995fbd3c0 |
| children | 44f61c24ddab |
| rev | line source |
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| 342 | 1 /* |
| 579 | 2 * Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 342 | 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 // There are various techniques that require threads to be able to log | |
| 26 // addresses. For example, a generational write barrier might log | |
| 27 // the addresses of modified old-generation objects. This type supports | |
| 28 // this operation. | |
| 29 | |
| 30 class PtrQueueSet; | |
| 31 | |
|
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32 class PtrQueue VALUE_OBJ_CLASS_SPEC { |
| 342 | 33 |
| 34 protected: | |
| 35 // The ptr queue set to which this queue belongs. | |
| 36 PtrQueueSet* _qset; | |
| 37 | |
| 38 // Whether updates should be logged. | |
| 39 bool _active; | |
| 40 | |
| 41 // The buffer. | |
| 42 void** _buf; | |
| 43 // The index at which an object was last enqueued. Starts at "_sz" | |
| 44 // (indicating an empty buffer) and goes towards zero. | |
| 45 size_t _index; | |
| 46 | |
| 47 // The size of the buffer. | |
| 48 size_t _sz; | |
| 49 | |
| 50 // If true, the queue is permanent, and doesn't need to deallocate | |
| 51 // its buffer in the destructor (since that obtains a lock which may not | |
| 52 // be legally locked by then. | |
| 53 bool _perm; | |
| 54 | |
| 55 // If there is a lock associated with this buffer, this is that lock. | |
| 56 Mutex* _lock; | |
| 57 | |
| 58 PtrQueueSet* qset() { return _qset; } | |
| 59 | |
| 60 public: | |
| 61 // Initialize this queue to contain a null buffer, and be part of the | |
| 62 // given PtrQueueSet. | |
| 63 PtrQueue(PtrQueueSet*, bool perm = false); | |
| 64 // Release any contained resources. | |
|
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65 void flush(); |
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66 // Calls flush() when destroyed. |
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67 ~PtrQueue() { flush(); } |
| 342 | 68 |
| 69 // Associate a lock with a ptr queue. | |
| 70 void set_lock(Mutex* lock) { _lock = lock; } | |
| 71 | |
| 72 void reset() { if (_buf != NULL) _index = _sz; } | |
| 73 | |
| 74 // Enqueues the given "obj". | |
| 75 void enqueue(void* ptr) { | |
| 76 if (!_active) return; | |
| 77 else enqueue_known_active(ptr); | |
| 78 } | |
| 79 | |
| 80 inline void handle_zero_index(); | |
| 81 void locking_enqueue_completed_buffer(void** buf); | |
| 82 | |
| 83 void enqueue_known_active(void* ptr); | |
| 84 | |
| 85 size_t size() { | |
| 86 assert(_sz >= _index, "Invariant."); | |
| 87 return _buf == NULL ? 0 : _sz - _index; | |
| 88 } | |
| 89 | |
| 90 // Set the "active" property of the queue to "b". An enqueue to an | |
| 91 // inactive thread is a no-op. Setting a queue to inactive resets its | |
| 92 // log to the empty state. | |
| 93 void set_active(bool b) { | |
| 94 _active = b; | |
| 95 if (!b && _buf != NULL) { | |
| 96 _index = _sz; | |
| 97 } else if (b && _buf != NULL) { | |
| 98 assert(_index == _sz, "invariant: queues are empty when activated."); | |
| 99 } | |
| 100 } | |
| 101 | |
| 102 static int byte_index_to_index(int ind) { | |
| 103 assert((ind % oopSize) == 0, "Invariant."); | |
| 104 return ind / oopSize; | |
| 105 } | |
| 106 | |
| 107 static int index_to_byte_index(int byte_ind) { | |
| 108 return byte_ind * oopSize; | |
| 109 } | |
| 110 | |
| 111 // To support compiler. | |
| 112 static ByteSize byte_offset_of_index() { | |
| 113 return byte_offset_of(PtrQueue, _index); | |
| 114 } | |
| 115 static ByteSize byte_width_of_index() { return in_ByteSize(sizeof(size_t)); } | |
| 116 | |
| 117 static ByteSize byte_offset_of_buf() { | |
| 118 return byte_offset_of(PtrQueue, _buf); | |
| 119 } | |
| 120 static ByteSize byte_width_of_buf() { return in_ByteSize(sizeof(void*)); } | |
| 121 | |
| 122 static ByteSize byte_offset_of_active() { | |
| 123 return byte_offset_of(PtrQueue, _active); | |
| 124 } | |
| 125 static ByteSize byte_width_of_active() { return in_ByteSize(sizeof(bool)); } | |
| 126 | |
| 127 }; | |
| 128 | |
| 129 // A PtrQueueSet represents resources common to a set of pointer queues. | |
| 130 // In particular, the individual queues allocate buffers from this shared | |
| 131 // set, and return completed buffers to the set. | |
| 132 // All these variables are are protected by the TLOQ_CBL_mon. XXX ??? | |
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133 class PtrQueueSet VALUE_OBJ_CLASS_SPEC { |
| 342 | 134 |
| 135 protected: | |
| 136 | |
| 137 class CompletedBufferNode: public CHeapObj { | |
| 138 public: | |
| 139 void** buf; | |
| 140 size_t index; | |
| 141 CompletedBufferNode* next; | |
| 142 CompletedBufferNode() : buf(NULL), | |
| 143 index(0), next(NULL){ } | |
| 144 }; | |
| 145 | |
| 146 Monitor* _cbl_mon; // Protects the fields below. | |
| 147 CompletedBufferNode* _completed_buffers_head; | |
| 148 CompletedBufferNode* _completed_buffers_tail; | |
| 149 size_t _n_completed_buffers; | |
| 150 size_t _process_completed_threshold; | |
| 151 volatile bool _process_completed; | |
| 152 | |
| 153 // This (and the interpretation of the first element as a "next" | |
| 154 // pointer) are protected by the TLOQ_FL_lock. | |
| 155 Mutex* _fl_lock; | |
| 156 void** _buf_free_list; | |
| 157 size_t _buf_free_list_sz; | |
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158 // Queue set can share a freelist. The _fl_owner variable |
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159 // specifies the owner. It is set to "this" by default. |
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160 PtrQueueSet* _fl_owner; |
| 342 | 161 |
| 162 // The size of all buffers in the set. | |
| 163 size_t _sz; | |
| 164 | |
| 165 bool _all_active; | |
| 166 | |
| 167 // If true, notify_all on _cbl_mon when the threshold is reached. | |
| 168 bool _notify_when_complete; | |
| 169 | |
| 170 // Maximum number of elements allowed on completed queue: after that, | |
| 171 // enqueuer does the work itself. Zero indicates no maximum. | |
| 172 int _max_completed_queue; | |
| 173 | |
| 174 int completed_buffers_list_length(); | |
| 175 void assert_completed_buffer_list_len_correct_locked(); | |
| 176 void assert_completed_buffer_list_len_correct(); | |
| 177 | |
| 178 protected: | |
| 179 // A mutator thread does the the work of processing a buffer. | |
| 180 // Returns "true" iff the work is complete (and the buffer may be | |
| 181 // deallocated). | |
| 182 virtual bool mut_process_buffer(void** buf) { | |
| 183 ShouldNotReachHere(); | |
| 184 return false; | |
| 185 } | |
| 186 | |
| 187 public: | |
| 188 // Create an empty ptr queue set. | |
| 189 PtrQueueSet(bool notify_when_complete = false); | |
| 190 | |
| 191 // Because of init-order concerns, we can't pass these as constructor | |
| 192 // arguments. | |
| 193 void initialize(Monitor* cbl_mon, Mutex* fl_lock, | |
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194 int max_completed_queue = 0, |
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195 PtrQueueSet *fl_owner = NULL) { |
| 342 | 196 _max_completed_queue = max_completed_queue; |
| 197 assert(cbl_mon != NULL && fl_lock != NULL, "Init order issue?"); | |
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198 _cbl_mon = cbl_mon; |
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199 _fl_lock = fl_lock; |
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200 _fl_owner = (fl_owner != NULL) ? fl_owner : this; |
| 342 | 201 } |
| 202 | |
| 203 // Return an empty oop array of size _sz (required to be non-zero). | |
| 204 void** allocate_buffer(); | |
| 205 | |
| 206 // Return an empty buffer to the free list. The "buf" argument is | |
| 207 // required to be a pointer to the head of an array of length "_sz". | |
| 208 void deallocate_buffer(void** buf); | |
| 209 | |
| 210 // Declares that "buf" is a complete buffer. | |
| 211 void enqueue_complete_buffer(void** buf, size_t index = 0, | |
| 212 bool ignore_max_completed = false); | |
| 213 | |
| 214 bool completed_buffers_exist_dirty() { | |
| 215 return _n_completed_buffers > 0; | |
| 216 } | |
| 217 | |
| 218 bool process_completed_buffers() { return _process_completed; } | |
| 219 | |
| 220 bool active() { return _all_active; } | |
| 221 | |
| 222 // Set the buffer size. Should be called before any "enqueue" operation | |
| 223 // can be called. And should only be called once. | |
| 224 void set_buffer_size(size_t sz); | |
| 225 | |
| 226 // Get the buffer size. | |
| 227 size_t buffer_size() { return _sz; } | |
| 228 | |
| 229 // Set the number of completed buffers that triggers log processing. | |
| 230 void set_process_completed_threshold(size_t sz); | |
| 231 | |
| 232 // Must only be called at a safe point. Indicates that the buffer free | |
| 233 // list size may be reduced, if that is deemed desirable. | |
| 234 void reduce_free_list(); | |
| 235 | |
| 236 size_t completed_buffers_num() { return _n_completed_buffers; } | |
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237 |
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238 void merge_bufferlists(PtrQueueSet* src); |
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239 void merge_freelists(PtrQueueSet* src); |
| 342 | 240 }; |