Mercurial > hg > graal-jvmci-8
annotate src/share/vm/utilities/taskqueue.hpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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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 | |
1972 | 25 #ifndef SHARE_VM_UTILITIES_TASKQUEUE_HPP |
26 #define SHARE_VM_UTILITIES_TASKQUEUE_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "memory/allocation.inline.hpp" | |
30 #include "runtime/mutex.hpp" | |
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31 #include "runtime/orderAccess.inline.hpp" |
1972 | 32 #include "utilities/stack.hpp" |
33 | |
1665 | 34 // Simple TaskQueue stats that are collected by default in debug builds. |
35 | |
36 #if !defined(TASKQUEUE_STATS) && defined(ASSERT) | |
37 #define TASKQUEUE_STATS 1 | |
38 #elif !defined(TASKQUEUE_STATS) | |
39 #define TASKQUEUE_STATS 0 | |
40 #endif | |
41 | |
42 #if TASKQUEUE_STATS | |
43 #define TASKQUEUE_STATS_ONLY(code) code | |
44 #else | |
45 #define TASKQUEUE_STATS_ONLY(code) | |
46 #endif // TASKQUEUE_STATS | |
47 | |
48 #if TASKQUEUE_STATS | |
49 class TaskQueueStats { | |
50 public: | |
51 enum StatId { | |
52 push, // number of taskqueue pushes | |
53 pop, // number of taskqueue pops | |
54 pop_slow, // subset of taskqueue pops that were done slow-path | |
55 steal_attempt, // number of taskqueue steal attempts | |
56 steal, // number of taskqueue steals | |
57 overflow, // number of overflow pushes | |
58 overflow_max_len, // max length of overflow stack | |
59 last_stat_id | |
60 }; | |
61 | |
62 public: | |
63 inline TaskQueueStats() { reset(); } | |
64 | |
65 inline void record_push() { ++_stats[push]; } | |
66 inline void record_pop() { ++_stats[pop]; } | |
67 inline void record_pop_slow() { record_pop(); ++_stats[pop_slow]; } | |
68 inline void record_steal(bool success); | |
69 inline void record_overflow(size_t new_length); | |
70 | |
1709 | 71 TaskQueueStats & operator +=(const TaskQueueStats & addend); |
72 | |
1665 | 73 inline size_t get(StatId id) const { return _stats[id]; } |
74 inline const size_t* get() const { return _stats; } | |
75 | |
76 inline void reset(); | |
77 | |
1709 | 78 // Print the specified line of the header (does not include a line separator). |
1665 | 79 static void print_header(unsigned int line, outputStream* const stream = tty, |
80 unsigned int width = 10); | |
1709 | 81 // Print the statistics (does not include a line separator). |
1665 | 82 void print(outputStream* const stream = tty, unsigned int width = 10) const; |
83 | |
1709 | 84 DEBUG_ONLY(void verify() const;) |
85 | |
1665 | 86 private: |
87 size_t _stats[last_stat_id]; | |
88 static const char * const _names[last_stat_id]; | |
89 }; | |
90 | |
91 void TaskQueueStats::record_steal(bool success) { | |
92 ++_stats[steal_attempt]; | |
93 if (success) ++_stats[steal]; | |
94 } | |
95 | |
96 void TaskQueueStats::record_overflow(size_t new_len) { | |
97 ++_stats[overflow]; | |
98 if (new_len > _stats[overflow_max_len]) _stats[overflow_max_len] = new_len; | |
99 } | |
100 | |
101 void TaskQueueStats::reset() { | |
102 memset(_stats, 0, sizeof(_stats)); | |
103 } | |
104 #endif // TASKQUEUE_STATS | |
105 | |
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106 // TaskQueueSuper collects functionality common to all GenericTaskQueue instances. |
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107 |
6197 | 108 template <unsigned int N, MEMFLAGS F> |
109 class TaskQueueSuper: public CHeapObj<F> { | |
0 | 110 protected: |
907 | 111 // Internal type for indexing the queue; also used for the tag. |
112 typedef NOT_LP64(uint16_t) LP64_ONLY(uint32_t) idx_t; | |
113 | |
114 // The first free element after the last one pushed (mod N). | |
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115 volatile uint _bottom; |
0 | 116 |
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117 enum { MOD_N_MASK = N - 1 }; |
907 | 118 |
119 class Age { | |
120 public: | |
121 Age(size_t data = 0) { _data = data; } | |
122 Age(const Age& age) { _data = age._data; } | |
123 Age(idx_t top, idx_t tag) { _fields._top = top; _fields._tag = tag; } | |
0 | 124 |
907 | 125 Age get() const volatile { return _data; } |
126 void set(Age age) volatile { _data = age._data; } | |
127 | |
128 idx_t top() const volatile { return _fields._top; } | |
129 idx_t tag() const volatile { return _fields._tag; } | |
0 | 130 |
907 | 131 // Increment top; if it wraps, increment tag also. |
132 void increment() { | |
133 _fields._top = increment_index(_fields._top); | |
134 if (_fields._top == 0) ++_fields._tag; | |
135 } | |
0 | 136 |
907 | 137 Age cmpxchg(const Age new_age, const Age old_age) volatile { |
138 return (size_t) Atomic::cmpxchg_ptr((intptr_t)new_age._data, | |
139 (volatile intptr_t *)&_data, | |
140 (intptr_t)old_age._data); | |
141 } | |
142 | |
143 bool operator ==(const Age& other) const { return _data == other._data; } | |
0 | 144 |
907 | 145 private: |
146 struct fields { | |
147 idx_t _top; | |
148 idx_t _tag; | |
149 }; | |
150 union { | |
151 size_t _data; | |
152 fields _fields; | |
153 }; | |
0 | 154 }; |
907 | 155 |
156 volatile Age _age; | |
157 | |
158 // These both operate mod N. | |
159 static uint increment_index(uint ind) { | |
160 return (ind + 1) & MOD_N_MASK; | |
0 | 161 } |
907 | 162 static uint decrement_index(uint ind) { |
163 return (ind - 1) & MOD_N_MASK; | |
0 | 164 } |
165 | |
907 | 166 // Returns a number in the range [0..N). If the result is "N-1", it should be |
167 // interpreted as 0. | |
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168 uint dirty_size(uint bot, uint top) const { |
907 | 169 return (bot - top) & MOD_N_MASK; |
0 | 170 } |
171 | |
172 // Returns the size corresponding to the given "bot" and "top". | |
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173 uint size(uint bot, uint top) const { |
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174 uint sz = dirty_size(bot, top); |
907 | 175 // Has the queue "wrapped", so that bottom is less than top? There's a |
176 // complicated special case here. A pair of threads could perform pop_local | |
177 // and pop_global operations concurrently, starting from a state in which | |
178 // _bottom == _top+1. The pop_local could succeed in decrementing _bottom, | |
179 // and the pop_global in incrementing _top (in which case the pop_global | |
180 // will be awarded the contested queue element.) The resulting state must | |
181 // be interpreted as an empty queue. (We only need to worry about one such | |
182 // event: only the queue owner performs pop_local's, and several concurrent | |
183 // threads attempting to perform the pop_global will all perform the same | |
184 // CAS, and only one can succeed.) Any stealing thread that reads after | |
185 // either the increment or decrement will see an empty queue, and will not | |
186 // join the competitors. The "sz == -1 || sz == N-1" state will not be | |
187 // modified by concurrent queues, so the owner thread can reset the state to | |
188 // _bottom == top so subsequent pushes will be performed normally. | |
189 return (sz == N - 1) ? 0 : sz; | |
0 | 190 } |
191 | |
192 public: | |
193 TaskQueueSuper() : _bottom(0), _age() {} | |
194 | |
1638 | 195 // Return true if the TaskQueue contains/does not contain any tasks. |
196 bool peek() const { return _bottom != _age.top(); } | |
197 bool is_empty() const { return size() == 0; } | |
0 | 198 |
199 // Return an estimate of the number of elements in the queue. | |
200 // The "careful" version admits the possibility of pop_local/pop_global | |
201 // races. | |
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202 uint size() const { |
907 | 203 return size(_bottom, _age.top()); |
0 | 204 } |
205 | |
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206 uint dirty_size() const { |
907 | 207 return dirty_size(_bottom, _age.top()); |
0 | 208 } |
209 | |
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210 void set_empty() { |
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211 _bottom = 0; |
907 | 212 _age.set(0); |
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213 } |
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214 |
0 | 215 // Maximum number of elements allowed in the queue. This is two less |
216 // than the actual queue size, for somewhat complicated reasons. | |
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217 uint max_elems() const { return N - 2; } |
1284 | 218 |
219 // Total size of queue. | |
220 static const uint total_size() { return N; } | |
1665 | 221 |
222 TASKQUEUE_STATS_ONLY(TaskQueueStats stats;) | |
0 | 223 }; |
224 | |
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225 // |
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226 // GenericTaskQueue implements an ABP, Aurora-Blumofe-Plaxton, double- |
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227 // ended-queue (deque), intended for use in work stealing. Queue operations |
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228 // are non-blocking. |
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229 // |
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230 // A queue owner thread performs push() and pop_local() operations on one end |
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231 // of the queue, while other threads may steal work using the pop_global() |
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232 // method. |
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233 // |
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234 // The main difference to the original algorithm is that this |
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235 // implementation allows wrap-around at the end of its allocated |
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236 // storage, which is an array. |
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237 // |
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238 // The original paper is: |
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239 // |
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240 // Arora, N. S., Blumofe, R. D., and Plaxton, C. G. |
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241 // Thread scheduling for multiprogrammed multiprocessors. |
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242 // Theory of Computing Systems 34, 2 (2001), 115-144. |
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243 // |
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244 // The following paper provides an correctness proof and an |
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245 // implementation for weakly ordered memory models including (pseudo-) |
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246 // code containing memory barriers for a Chase-Lev deque. Chase-Lev is |
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247 // similar to ABP, with the main difference that it allows resizing of the |
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248 // underlying storage: |
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249 // |
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250 // Le, N. M., Pop, A., Cohen A., and Nardell, F. Z. |
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251 // Correct and efficient work-stealing for weak memory models |
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252 // Proceedings of the 18th ACM SIGPLAN symposium on Principles and |
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253 // practice of parallel programming (PPoPP 2013), 69-80 |
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254 // |
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255 |
6197 | 256 template <class E, MEMFLAGS F, unsigned int N = TASKQUEUE_SIZE> |
257 class GenericTaskQueue: public TaskQueueSuper<N, F> { | |
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258 ArrayAllocator<E, F> _array_allocator; |
6197 | 259 protected: |
260 typedef typename TaskQueueSuper<N, F>::Age Age; | |
261 typedef typename TaskQueueSuper<N, F>::idx_t idx_t; | |
262 | |
263 using TaskQueueSuper<N, F>::_bottom; | |
264 using TaskQueueSuper<N, F>::_age; | |
265 using TaskQueueSuper<N, F>::increment_index; | |
266 using TaskQueueSuper<N, F>::decrement_index; | |
267 using TaskQueueSuper<N, F>::dirty_size; | |
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268 |
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269 public: |
6197 | 270 using TaskQueueSuper<N, F>::max_elems; |
271 using TaskQueueSuper<N, F>::size; | |
272 | |
273 #if TASKQUEUE_STATS | |
274 using TaskQueueSuper<N, F>::stats; | |
275 #endif | |
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276 |
0 | 277 private: |
278 // Slow paths for push, pop_local. (pop_global has no fast path.) | |
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279 bool push_slow(E t, uint dirty_n_elems); |
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280 bool pop_local_slow(uint localBot, Age oldAge); |
0 | 281 |
282 public: | |
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283 typedef E element_type; |
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284 |
0 | 285 // Initializes the queue to empty. |
286 GenericTaskQueue(); | |
287 | |
288 void initialize(); | |
289 | |
1638 | 290 // Push the task "t" on the queue. Returns "false" iff the queue is full. |
0 | 291 inline bool push(E t); |
292 | |
1638 | 293 // Attempts to claim a task from the "local" end of the queue (the most |
294 // recently pushed). If successful, returns true and sets t to the task; | |
295 // otherwise, returns false (the queue is empty). | |
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296 inline bool pop_local(volatile E& t); |
0 | 297 |
1638 | 298 // Like pop_local(), but uses the "global" end of the queue (the least |
299 // recently pushed). | |
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300 bool pop_global(volatile E& t); |
0 | 301 |
302 // Delete any resource associated with the queue. | |
303 ~GenericTaskQueue(); | |
304 | |
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305 // apply the closure to all elements in the task queue |
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306 void oops_do(OopClosure* f); |
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307 |
0 | 308 private: |
309 // Element array. | |
310 volatile E* _elems; | |
311 }; | |
312 | |
6197 | 313 template<class E, MEMFLAGS F, unsigned int N> |
314 GenericTaskQueue<E, F, N>::GenericTaskQueue() { | |
907 | 315 assert(sizeof(Age) == sizeof(size_t), "Depends on this."); |
0 | 316 } |
317 | |
6197 | 318 template<class E, MEMFLAGS F, unsigned int N> |
319 void GenericTaskQueue<E, F, N>::initialize() { | |
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320 _elems = _array_allocator.allocate(N); |
0 | 321 } |
322 | |
6197 | 323 template<class E, MEMFLAGS F, unsigned int N> |
324 void GenericTaskQueue<E, F, N>::oops_do(OopClosure* f) { | |
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325 // tty->print_cr("START OopTaskQueue::oops_do"); |
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326 uint iters = size(); |
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327 uint index = _bottom; |
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328 for (uint i = 0; i < iters; ++i) { |
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329 index = decrement_index(index); |
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330 // tty->print_cr(" doing entry %d," INTPTR_T " -> " INTPTR_T, |
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331 // index, &_elems[index], _elems[index]); |
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332 E* t = (E*)&_elems[index]; // cast away volatility |
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333 oop* p = (oop*)t; |
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334 assert((*t)->is_oop_or_null(), "Not an oop or null"); |
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335 f->do_oop(p); |
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336 } |
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337 // tty->print_cr("END OopTaskQueue::oops_do"); |
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338 } |
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339 |
6197 | 340 template<class E, MEMFLAGS F, unsigned int N> |
341 bool GenericTaskQueue<E, F, N>::push_slow(E t, uint dirty_n_elems) { | |
907 | 342 if (dirty_n_elems == N - 1) { |
0 | 343 // Actually means 0, so do the push. |
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344 uint localBot = _bottom; |
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345 // g++ complains if the volatile result of the assignment is |
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346 // unused, so we cast the volatile away. We cannot cast directly |
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347 // to void, because gcc treats that as not using the result of the |
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348 // assignment. However, casting to E& means that we trigger an |
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349 // unused-value warning. So, we cast the E& to void. |
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350 (void)const_cast<E&>(_elems[localBot] = t); |
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351 OrderAccess::release_store(&_bottom, increment_index(localBot)); |
1665 | 352 TASKQUEUE_STATS_ONLY(stats.record_push()); |
0 | 353 return true; |
907 | 354 } |
355 return false; | |
0 | 356 } |
357 | |
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358 // pop_local_slow() is done by the owning thread and is trying to |
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359 // get the last task in the queue. It will compete with pop_global() |
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360 // that will be used by other threads. The tag age is incremented |
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361 // whenever the queue goes empty which it will do here if this thread |
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362 // gets the last task or in pop_global() if the queue wraps (top == 0 |
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363 // and pop_global() succeeds, see pop_global()). |
6197 | 364 template<class E, MEMFLAGS F, unsigned int N> |
365 bool GenericTaskQueue<E, F, N>::pop_local_slow(uint localBot, Age oldAge) { | |
0 | 366 // This queue was observed to contain exactly one element; either this |
367 // thread will claim it, or a competing "pop_global". In either case, | |
368 // the queue will be logically empty afterwards. Create a new Age value | |
369 // that represents the empty queue for the given value of "_bottom". (We | |
370 // must also increment "tag" because of the case where "bottom == 1", | |
371 // "top == 0". A pop_global could read the queue element in that case, | |
372 // then have the owner thread do a pop followed by another push. Without | |
373 // the incrementing of "tag", the pop_global's CAS could succeed, | |
374 // allowing it to believe it has claimed the stale element.) | |
907 | 375 Age newAge((idx_t)localBot, oldAge.tag() + 1); |
0 | 376 // Perhaps a competing pop_global has already incremented "top", in which |
377 // case it wins the element. | |
378 if (localBot == oldAge.top()) { | |
379 // No competing pop_global has yet incremented "top"; we'll try to | |
380 // install new_age, thus claiming the element. | |
907 | 381 Age tempAge = _age.cmpxchg(newAge, oldAge); |
0 | 382 if (tempAge == oldAge) { |
383 // We win. | |
907 | 384 assert(dirty_size(localBot, _age.top()) != N - 1, "sanity"); |
1665 | 385 TASKQUEUE_STATS_ONLY(stats.record_pop_slow()); |
0 | 386 return true; |
387 } | |
388 } | |
907 | 389 // We lose; a completing pop_global gets the element. But the queue is empty |
390 // and top is greater than bottom. Fix this representation of the empty queue | |
391 // to become the canonical one. | |
392 _age.set(newAge); | |
393 assert(dirty_size(localBot, _age.top()) != N - 1, "sanity"); | |
0 | 394 return false; |
395 } | |
396 | |
6197 | 397 template<class E, MEMFLAGS F, unsigned int N> |
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398 bool GenericTaskQueue<E, F, N>::pop_global(volatile E& t) { |
907 | 399 Age oldAge = _age.get(); |
11997 | 400 // Architectures with weak memory model require a barrier here |
401 // to guarantee that bottom is not older than age, | |
402 // which is crucial for the correctness of the algorithm. | |
403 #if !(defined SPARC || defined IA32 || defined AMD64) | |
404 OrderAccess::fence(); | |
405 #endif | |
406 uint localBot = OrderAccess::load_acquire((volatile juint*)&_bottom); | |
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407 uint n_elems = size(localBot, oldAge.top()); |
0 | 408 if (n_elems == 0) { |
409 return false; | |
410 } | |
907 | 411 |
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412 // g++ complains if the volatile result of the assignment is |
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413 // unused, so we cast the volatile away. We cannot cast directly |
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414 // to void, because gcc treats that as not using the result of the |
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415 // assignment. However, casting to E& means that we trigger an |
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416 // unused-value warning. So, we cast the E& to void. |
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417 (void) const_cast<E&>(t = _elems[oldAge.top()]); |
907 | 418 Age newAge(oldAge); |
419 newAge.increment(); | |
420 Age resAge = _age.cmpxchg(newAge, oldAge); | |
421 | |
0 | 422 // Note that using "_bottom" here might fail, since a pop_local might |
423 // have decremented it. | |
907 | 424 assert(dirty_size(localBot, newAge.top()) != N - 1, "sanity"); |
425 return resAge == oldAge; | |
0 | 426 } |
427 | |
6197 | 428 template<class E, MEMFLAGS F, unsigned int N> |
429 GenericTaskQueue<E, F, N>::~GenericTaskQueue() { | |
430 FREE_C_HEAP_ARRAY(E, _elems, F); | |
0 | 431 } |
432 | |
1638 | 433 // OverflowTaskQueue is a TaskQueue that also includes an overflow stack for |
434 // elements that do not fit in the TaskQueue. | |
435 // | |
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436 // This class hides two methods from super classes: |
1638 | 437 // |
438 // push() - push onto the task queue or, if that fails, onto the overflow stack | |
439 // is_empty() - return true if both the TaskQueue and overflow stack are empty | |
440 // | |
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441 // Note that size() is not hidden--it returns the number of elements in the |
1638 | 442 // TaskQueue, and does not include the size of the overflow stack. This |
443 // simplifies replacement of GenericTaskQueues with OverflowTaskQueues. | |
6197 | 444 template<class E, MEMFLAGS F, unsigned int N = TASKQUEUE_SIZE> |
445 class OverflowTaskQueue: public GenericTaskQueue<E, F, N> | |
1638 | 446 { |
447 public: | |
6197 | 448 typedef Stack<E, F> overflow_t; |
449 typedef GenericTaskQueue<E, F, N> taskqueue_t; | |
1638 | 450 |
1665 | 451 TASKQUEUE_STATS_ONLY(using taskqueue_t::stats;) |
452 | |
1638 | 453 // Push task t onto the queue or onto the overflow stack. Return true. |
454 inline bool push(E t); | |
455 | |
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456 // Try to push task t onto the queue only. Returns true if successful, false otherwise. |
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457 inline bool try_push_to_taskqueue(E t); |
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458 |
1638 | 459 // Attempt to pop from the overflow stack; return true if anything was popped. |
460 inline bool pop_overflow(E& t); | |
461 | |
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462 inline overflow_t* overflow_stack() { return &_overflow_stack; } |
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463 |
1638 | 464 inline bool taskqueue_empty() const { return taskqueue_t::is_empty(); } |
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465 inline bool overflow_empty() const { return _overflow_stack.is_empty(); } |
1638 | 466 inline bool is_empty() const { |
467 return taskqueue_empty() && overflow_empty(); | |
468 } | |
469 | |
470 private: | |
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471 overflow_t _overflow_stack; |
1638 | 472 }; |
473 | |
6197 | 474 template <class E, MEMFLAGS F, unsigned int N> |
475 bool OverflowTaskQueue<E, F, N>::push(E t) | |
1638 | 476 { |
477 if (!taskqueue_t::push(t)) { | |
478 overflow_stack()->push(t); | |
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479 TASKQUEUE_STATS_ONLY(stats.record_overflow(overflow_stack()->size())); |
1638 | 480 } |
481 return true; | |
482 } | |
483 | |
6197 | 484 template <class E, MEMFLAGS F, unsigned int N> |
485 bool OverflowTaskQueue<E, F, N>::pop_overflow(E& t) | |
1638 | 486 { |
487 if (overflow_empty()) return false; | |
488 t = overflow_stack()->pop(); | |
489 return true; | |
490 } | |
491 | |
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492 template <class E, MEMFLAGS F, unsigned int N> |
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493 bool OverflowTaskQueue<E, F, N>::try_push_to_taskqueue(E t) { |
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494 return taskqueue_t::push(t); |
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495 } |
6197 | 496 class TaskQueueSetSuper { |
0 | 497 protected: |
498 static int randomParkAndMiller(int* seed0); | |
499 public: | |
500 // Returns "true" if some TaskQueue in the set contains a task. | |
501 virtual bool peek() = 0; | |
502 }; | |
503 | |
6197 | 504 template <MEMFLAGS F> class TaskQueueSetSuperImpl: public CHeapObj<F>, public TaskQueueSetSuper { |
505 }; | |
506 | |
507 template<class T, MEMFLAGS F> | |
508 class GenericTaskQueueSet: public TaskQueueSetSuperImpl<F> { | |
0 | 509 private: |
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510 uint _n; |
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511 T** _queues; |
0 | 512 |
513 public: | |
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514 typedef typename T::element_type E; |
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515 |
0 | 516 GenericTaskQueueSet(int n) : _n(n) { |
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517 typedef T* GenericTaskQueuePtr; |
6197 | 518 _queues = NEW_C_HEAP_ARRAY(GenericTaskQueuePtr, n, F); |
0 | 519 for (int i = 0; i < n; i++) { |
520 _queues[i] = NULL; | |
521 } | |
522 } | |
523 | |
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524 bool steal_best_of_2(uint queue_num, int* seed, E& t); |
0 | 525 |
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526 void register_queue(uint i, T* q); |
0 | 527 |
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528 T* queue(uint n); |
0 | 529 |
1638 | 530 // The thread with queue number "queue_num" (and whose random number seed is |
531 // at "seed") is trying to steal a task from some other queue. (It may try | |
532 // several queues, according to some configuration parameter.) If some steal | |
533 // succeeds, returns "true" and sets "t" to the stolen task, otherwise returns | |
534 // false. | |
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535 bool steal(uint queue_num, int* seed, E& t); |
0 | 536 |
537 bool peek(); | |
538 }; | |
539 | |
6197 | 540 template<class T, MEMFLAGS F> void |
541 GenericTaskQueueSet<T, F>::register_queue(uint i, T* q) { | |
541
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542 assert(i < _n, "index out of range."); |
0 | 543 _queues[i] = q; |
544 } | |
545 | |
6197 | 546 template<class T, MEMFLAGS F> T* |
547 GenericTaskQueueSet<T, F>::queue(uint i) { | |
0 | 548 return _queues[i]; |
549 } | |
550 | |
6197 | 551 template<class T, MEMFLAGS F> bool |
552 GenericTaskQueueSet<T, F>::steal(uint queue_num, int* seed, E& t) { | |
1665 | 553 for (uint i = 0; i < 2 * _n; i++) { |
554 if (steal_best_of_2(queue_num, seed, t)) { | |
555 TASKQUEUE_STATS_ONLY(queue(queue_num)->stats.record_steal(true)); | |
0 | 556 return true; |
1665 | 557 } |
558 } | |
559 TASKQUEUE_STATS_ONLY(queue(queue_num)->stats.record_steal(false)); | |
0 | 560 return false; |
561 } | |
562 | |
6197 | 563 template<class T, MEMFLAGS F> bool |
564 GenericTaskQueueSet<T, F>::steal_best_of_2(uint queue_num, int* seed, E& t) { | |
0 | 565 if (_n > 2) { |
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566 uint k1 = queue_num; |
6197 | 567 while (k1 == queue_num) k1 = TaskQueueSetSuper::randomParkAndMiller(seed) % _n; |
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568 uint k2 = queue_num; |
6197 | 569 while (k2 == queue_num || k2 == k1) k2 = TaskQueueSetSuper::randomParkAndMiller(seed) % _n; |
0 | 570 // Sample both and try the larger. |
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571 uint sz1 = _queues[k1]->size(); |
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572 uint sz2 = _queues[k2]->size(); |
0 | 573 if (sz2 > sz1) return _queues[k2]->pop_global(t); |
574 else return _queues[k1]->pop_global(t); | |
575 } else if (_n == 2) { | |
576 // Just try the other one. | |
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577 uint k = (queue_num + 1) % 2; |
0 | 578 return _queues[k]->pop_global(t); |
579 } else { | |
580 assert(_n == 1, "can't be zero."); | |
581 return false; | |
582 } | |
583 } | |
584 | |
6197 | 585 template<class T, MEMFLAGS F> |
586 bool GenericTaskQueueSet<T, F>::peek() { | |
0 | 587 // Try all the queues. |
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588 for (uint j = 0; j < _n; j++) { |
0 | 589 if (_queues[j]->peek()) |
590 return true; | |
591 } | |
592 return false; | |
593 } | |
594 | |
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595 // When to terminate from the termination protocol. |
6197 | 596 class TerminatorTerminator: public CHeapObj<mtInternal> { |
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597 public: |
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598 virtual bool should_exit_termination() = 0; |
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599 }; |
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600 |
0 | 601 // A class to aid in the termination of a set of parallel tasks using |
602 // TaskQueueSet's for work stealing. | |
603 | |
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604 #undef TRACESPINNING |
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605 |
0 | 606 class ParallelTaskTerminator: public StackObj { |
607 private: | |
608 int _n_threads; | |
609 TaskQueueSetSuper* _queue_set; | |
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610 int _offered_termination; |
0 | 611 |
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612 #ifdef TRACESPINNING |
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613 static uint _total_yields; |
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614 static uint _total_spins; |
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615 static uint _total_peeks; |
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616 #endif |
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617 |
0 | 618 bool peek_in_queue_set(); |
619 protected: | |
620 virtual void yield(); | |
621 void sleep(uint millis); | |
622 | |
623 public: | |
624 | |
625 // "n_threads" is the number of threads to be terminated. "queue_set" is a | |
626 // queue sets of work queues of other threads. | |
627 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set); | |
628 | |
629 // The current thread has no work, and is ready to terminate if everyone | |
630 // else is. If returns "true", all threads are terminated. If returns | |
631 // "false", available work has been observed in one of the task queues, | |
632 // so the global task is not complete. | |
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633 bool offer_termination() { |
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634 return offer_termination(NULL); |
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635 } |
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636 |
907 | 637 // As above, but it also terminates if the should_exit_termination() |
342
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638 // method of the terminator parameter returns true. If terminator is |
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639 // NULL, then it is ignored. |
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640 bool offer_termination(TerminatorTerminator* terminator); |
0 | 641 |
642 // Reset the terminator, so that it may be reused again. | |
643 // The caller is responsible for ensuring that this is done | |
644 // in an MT-safe manner, once the previous round of use of | |
645 // the terminator is finished. | |
646 void reset_for_reuse(); | |
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647 // Same as above but the number of parallel threads is set to the |
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648 // given number. |
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649 void reset_for_reuse(int n_threads); |
0 | 650 |
546
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651 #ifdef TRACESPINNING |
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652 static uint total_yields() { return _total_yields; } |
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653 static uint total_spins() { return _total_spins; } |
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654 static uint total_peeks() { return _total_peeks; } |
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655 static void print_termination_counts(); |
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656 #endif |
0 | 657 }; |
658 | |
6197 | 659 template<class E, MEMFLAGS F, unsigned int N> inline bool |
660 GenericTaskQueue<E, F, N>::push(E t) { | |
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661 uint localBot = _bottom; |
11997 | 662 assert(localBot < N, "_bottom out of range."); |
907 | 663 idx_t top = _age.top(); |
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664 uint dirty_n_elems = dirty_size(localBot, top); |
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665 assert(dirty_n_elems < N, "n_elems out of range."); |
0 | 666 if (dirty_n_elems < max_elems()) { |
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667 // g++ complains if the volatile result of the assignment is |
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668 // unused, so we cast the volatile away. We cannot cast directly |
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669 // to void, because gcc treats that as not using the result of the |
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670 // assignment. However, casting to E& means that we trigger an |
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671 // unused-value warning. So, we cast the E& to void. |
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672 (void) const_cast<E&>(_elems[localBot] = t); |
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673 OrderAccess::release_store(&_bottom, increment_index(localBot)); |
1665 | 674 TASKQUEUE_STATS_ONLY(stats.record_push()); |
0 | 675 return true; |
676 } else { | |
677 return push_slow(t, dirty_n_elems); | |
678 } | |
679 } | |
680 | |
6197 | 681 template<class E, MEMFLAGS F, unsigned int N> inline bool |
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682 GenericTaskQueue<E, F, N>::pop_local(volatile E& t) { |
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683 uint localBot = _bottom; |
907 | 684 // This value cannot be N-1. That can only occur as a result of |
0 | 685 // the assignment to bottom in this method. If it does, this method |
1638 | 686 // resets the size to 0 before the next call (which is sequential, |
0 | 687 // since this is pop_local.) |
907 | 688 uint dirty_n_elems = dirty_size(localBot, _age.top()); |
689 assert(dirty_n_elems != N - 1, "Shouldn't be possible..."); | |
0 | 690 if (dirty_n_elems == 0) return false; |
691 localBot = decrement_index(localBot); | |
692 _bottom = localBot; | |
693 // This is necessary to prevent any read below from being reordered | |
694 // before the store just above. | |
695 OrderAccess::fence(); | |
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696 // g++ complains if the volatile result of the assignment is |
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697 // unused, so we cast the volatile away. We cannot cast directly |
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698 // to void, because gcc treats that as not using the result of the |
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699 // assignment. However, casting to E& means that we trigger an |
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700 // unused-value warning. So, we cast the E& to void. |
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701 (void) const_cast<E&>(t = _elems[localBot]); |
0 | 702 // This is a second read of "age"; the "size()" above is the first. |
703 // If there's still at least one element in the queue, based on the | |
704 // "_bottom" and "age" we've read, then there can be no interference with | |
705 // a "pop_global" operation, and we're done. | |
907 | 706 idx_t tp = _age.top(); // XXX |
0 | 707 if (size(localBot, tp) > 0) { |
907 | 708 assert(dirty_size(localBot, tp) != N - 1, "sanity"); |
1665 | 709 TASKQUEUE_STATS_ONLY(stats.record_pop()); |
0 | 710 return true; |
711 } else { | |
712 // Otherwise, the queue contained exactly one element; we take the slow | |
713 // path. | |
907 | 714 return pop_local_slow(localBot, _age.get()); |
0 | 715 } |
716 } | |
717 | |
6197 | 718 typedef GenericTaskQueue<oop, mtGC> OopTaskQueue; |
719 typedef GenericTaskQueueSet<OopTaskQueue, mtGC> OopTaskQueueSet; | |
0 | 720 |
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721 #ifdef _MSC_VER |
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722 #pragma warning(push) |
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723 // warning C4522: multiple assignment operators specified |
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724 #pragma warning(disable:4522) |
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725 #endif |
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726 |
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727 // This is a container class for either an oop* or a narrowOop*. |
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728 // Both are pushed onto a task queue and the consumer will test is_narrow() |
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729 // to determine which should be processed. |
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730 class StarTask { |
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731 void* _holder; // either union oop* or narrowOop* |
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732 |
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733 enum { COMPRESSED_OOP_MASK = 1 }; |
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734 |
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735 public: |
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736 StarTask(narrowOop* p) { |
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737 assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!"); |
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738 _holder = (void *)((uintptr_t)p | COMPRESSED_OOP_MASK); |
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739 } |
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740 StarTask(oop* p) { |
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741 assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!"); |
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742 _holder = (void*)p; |
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743 } |
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744 StarTask() { _holder = NULL; } |
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745 operator oop*() { return (oop*)_holder; } |
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746 operator narrowOop*() { |
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747 return (narrowOop*)((uintptr_t)_holder & ~COMPRESSED_OOP_MASK); |
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748 } |
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749 |
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750 StarTask& operator=(const StarTask& t) { |
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751 _holder = t._holder; |
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752 return *this; |
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753 } |
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754 volatile StarTask& operator=(const volatile StarTask& t) volatile { |
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755 _holder = t._holder; |
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756 return *this; |
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757 } |
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758 |
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759 bool is_narrow() const { |
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760 return (((uintptr_t)_holder & COMPRESSED_OOP_MASK) != 0); |
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761 } |
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762 }; |
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763 |
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764 class ObjArrayTask |
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765 { |
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766 public: |
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767 ObjArrayTask(oop o = NULL, int idx = 0): _obj(o), _index(idx) { } |
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768 ObjArrayTask(oop o, size_t idx): _obj(o), _index(int(idx)) { |
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769 assert(idx <= size_t(max_jint), "too big"); |
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770 } |
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771 ObjArrayTask(const ObjArrayTask& t): _obj(t._obj), _index(t._index) { } |
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772 |
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773 ObjArrayTask& operator =(const ObjArrayTask& t) { |
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774 _obj = t._obj; |
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775 _index = t._index; |
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776 return *this; |
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777 } |
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778 volatile ObjArrayTask& |
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779 operator =(const volatile ObjArrayTask& t) volatile { |
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780 (void)const_cast<oop&>(_obj = t._obj); |
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781 _index = t._index; |
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782 return *this; |
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783 } |
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784 |
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785 inline oop obj() const { return _obj; } |
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786 inline int index() const { return _index; } |
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787 |
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788 DEBUG_ONLY(bool is_valid() const); // Tasks to be pushed/popped must be valid. |
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789 |
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790 private: |
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791 oop _obj; |
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792 int _index; |
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793 }; |
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794 |
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795 #ifdef _MSC_VER |
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796 #pragma warning(pop) |
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797 #endif |
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798 |
6197 | 799 typedef OverflowTaskQueue<StarTask, mtClass> OopStarTaskQueue; |
800 typedef GenericTaskQueueSet<OopStarTaskQueue, mtClass> OopStarTaskQueueSet; | |
0 | 801 |
6197 | 802 typedef OverflowTaskQueue<size_t, mtInternal> RegionTaskQueue; |
803 typedef GenericTaskQueueSet<RegionTaskQueue, mtClass> RegionTaskQueueSet; | |
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1709
diff
changeset
|
804 |
1972 | 805 |
806 #endif // SHARE_VM_UTILITIES_TASKQUEUE_HPP |