Mercurial > hg > truffle
annotate src/share/vm/utilities/workgroup.cpp @ 13382:570aaefce624
8028319: ConflictingDefaultsTest.testReabstract spins when running with -mode invoke and -Xcomp
Summary: Change _abstract_method_handler to return AbstractMethodError i2c, c2i and c2iv entries.
Reviewed-by: kvn, vlivanov
author | morris |
---|---|
date | Mon, 18 Nov 2013 12:26:51 -0800 |
parents | f9be75d21404 |
children | 78bbf4d43a14 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2013, 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 #include "precompiled.hpp" |
26 #include "memory/allocation.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "runtime/os.hpp" | |
29 #include "utilities/workgroup.hpp" | |
0 | 30 |
31 // Definitions of WorkGang methods. | |
32 | |
33 AbstractWorkGang::AbstractWorkGang(const char* name, | |
342 | 34 bool are_GC_task_threads, |
35 bool are_ConcurrentGC_threads) : | |
0 | 36 _name(name), |
342 | 37 _are_GC_task_threads(are_GC_task_threads), |
38 _are_ConcurrentGC_threads(are_ConcurrentGC_threads) { | |
39 | |
40 assert(!(are_GC_task_threads && are_ConcurrentGC_threads), | |
41 "They cannot both be STW GC and Concurrent threads" ); | |
42 | |
0 | 43 // Other initialization. |
44 _monitor = new Monitor(/* priority */ Mutex::leaf, | |
45 /* name */ "WorkGroup monitor", | |
342 | 46 /* allow_vm_block */ are_GC_task_threads); |
0 | 47 assert(monitor() != NULL, "Failed to allocate monitor"); |
48 _terminate = false; | |
49 _task = NULL; | |
50 _sequence_number = 0; | |
51 _started_workers = 0; | |
52 _finished_workers = 0; | |
53 } | |
54 | |
55 WorkGang::WorkGang(const char* name, | |
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56 uint workers, |
342 | 57 bool are_GC_task_threads, |
58 bool are_ConcurrentGC_threads) : | |
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59 AbstractWorkGang(name, are_GC_task_threads, are_ConcurrentGC_threads) { |
0 | 60 _total_workers = workers; |
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61 } |
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62 |
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63 GangWorker* WorkGang::allocate_worker(uint which) { |
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64 GangWorker* new_worker = new GangWorker(this, which); |
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65 return new_worker; |
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66 } |
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67 |
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68 // The current implementation will exit if the allocation |
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69 // of any worker fails. Still, return a boolean so that |
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70 // a future implementation can possibly do a partial |
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71 // initialization of the workers and report such to the |
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72 // caller. |
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73 bool WorkGang::initialize_workers() { |
342 | 74 |
0 | 75 if (TraceWorkGang) { |
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76 tty->print_cr("Constructing work gang %s with %d threads", |
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77 name(), |
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78 total_workers()); |
0 | 79 } |
6197 | 80 _gang_workers = NEW_C_HEAP_ARRAY(GangWorker*, total_workers(), mtInternal); |
342 | 81 if (gang_workers() == NULL) { |
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82 vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GangWorker array."); |
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83 return false; |
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84 } |
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85 os::ThreadType worker_type; |
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86 if (are_ConcurrentGC_threads()) { |
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87 worker_type = os::cgc_thread; |
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88 } else { |
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89 worker_type = os::pgc_thread; |
342 | 90 } |
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91 for (uint worker = 0; worker < total_workers(); worker += 1) { |
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92 GangWorker* new_worker = allocate_worker(worker); |
0 | 93 assert(new_worker != NULL, "Failed to allocate GangWorker"); |
94 _gang_workers[worker] = new_worker; | |
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95 if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) { |
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96 vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, |
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97 "Cannot create worker GC thread. Out of system resources."); |
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98 return false; |
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99 } |
0 | 100 if (!DisableStartThread) { |
101 os::start_thread(new_worker); | |
102 } | |
103 } | |
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104 return true; |
0 | 105 } |
106 | |
107 AbstractWorkGang::~AbstractWorkGang() { | |
108 if (TraceWorkGang) { | |
109 tty->print_cr("Destructing work gang %s", name()); | |
110 } | |
111 stop(); // stop all the workers | |
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112 for (uint worker = 0; worker < total_workers(); worker += 1) { |
0 | 113 delete gang_worker(worker); |
114 } | |
115 delete gang_workers(); | |
116 delete monitor(); | |
117 } | |
118 | |
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119 GangWorker* AbstractWorkGang::gang_worker(uint i) const { |
0 | 120 // Array index bounds checking. |
121 GangWorker* result = NULL; | |
122 assert(gang_workers() != NULL, "No workers for indexing"); | |
123 assert(((i >= 0) && (i < total_workers())), "Worker index out of bounds"); | |
124 result = _gang_workers[i]; | |
125 assert(result != NULL, "Indexing to null worker"); | |
126 return result; | |
127 } | |
128 | |
129 void WorkGang::run_task(AbstractGangTask* task) { | |
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130 run_task(task, total_workers()); |
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131 } |
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132 |
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133 void WorkGang::run_task(AbstractGangTask* task, uint no_of_parallel_workers) { |
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134 task->set_for_termination(no_of_parallel_workers); |
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135 |
0 | 136 // This thread is executed by the VM thread which does not block |
137 // on ordinary MutexLocker's. | |
138 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
139 if (TraceWorkGang) { | |
140 tty->print_cr("Running work gang %s task %s", name(), task->name()); | |
141 } | |
142 // Tell all the workers to run a task. | |
143 assert(task != NULL, "Running a null task"); | |
144 // Initialize. | |
145 _task = task; | |
146 _sequence_number += 1; | |
147 _started_workers = 0; | |
148 _finished_workers = 0; | |
149 // Tell the workers to get to work. | |
150 monitor()->notify_all(); | |
151 // Wait for them to be finished | |
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152 while (finished_workers() < no_of_parallel_workers) { |
0 | 153 if (TraceWorkGang) { |
154 tty->print_cr("Waiting in work gang %s: %d/%d finished sequence %d", | |
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155 name(), finished_workers(), no_of_parallel_workers, |
0 | 156 _sequence_number); |
157 } | |
158 monitor()->wait(/* no_safepoint_check */ true); | |
159 } | |
160 _task = NULL; | |
161 if (TraceWorkGang) { | |
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162 tty->print_cr("\nFinished work gang %s: %d/%d sequence %d", |
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163 name(), finished_workers(), no_of_parallel_workers, |
0 | 164 _sequence_number); |
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165 Thread* me = Thread::current(); |
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166 tty->print_cr(" T: 0x%x VM_thread: %d", me, me->is_VM_thread()); |
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167 } |
0 | 168 } |
169 | |
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170 void FlexibleWorkGang::run_task(AbstractGangTask* task) { |
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171 // If active_workers() is passed, _finished_workers |
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172 // must only be incremented for workers that find non_null |
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173 // work (as opposed to all those that just check that the |
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174 // task is not null). |
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175 WorkGang::run_task(task, (uint) active_workers()); |
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176 } |
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177 |
0 | 178 void AbstractWorkGang::stop() { |
179 // Tell all workers to terminate, then wait for them to become inactive. | |
180 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
181 if (TraceWorkGang) { | |
182 tty->print_cr("Stopping work gang %s task %s", name(), task()->name()); | |
183 } | |
184 _task = NULL; | |
185 _terminate = true; | |
186 monitor()->notify_all(); | |
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187 while (finished_workers() < active_workers()) { |
0 | 188 if (TraceWorkGang) { |
189 tty->print_cr("Waiting in work gang %s: %d/%d finished", | |
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190 name(), finished_workers(), active_workers()); |
0 | 191 } |
192 monitor()->wait(/* no_safepoint_check */ true); | |
193 } | |
194 } | |
195 | |
196 void AbstractWorkGang::internal_worker_poll(WorkData* data) const { | |
197 assert(monitor()->owned_by_self(), "worker_poll is an internal method"); | |
198 assert(data != NULL, "worker data is null"); | |
199 data->set_terminate(terminate()); | |
200 data->set_task(task()); | |
201 data->set_sequence_number(sequence_number()); | |
202 } | |
203 | |
204 void AbstractWorkGang::internal_note_start() { | |
205 assert(monitor()->owned_by_self(), "note_finish is an internal method"); | |
206 _started_workers += 1; | |
207 } | |
208 | |
209 void AbstractWorkGang::internal_note_finish() { | |
210 assert(monitor()->owned_by_self(), "note_finish is an internal method"); | |
211 _finished_workers += 1; | |
212 } | |
213 | |
214 void AbstractWorkGang::print_worker_threads_on(outputStream* st) const { | |
215 uint num_thr = total_workers(); | |
216 for (uint i = 0; i < num_thr; i++) { | |
217 gang_worker(i)->print_on(st); | |
218 st->cr(); | |
219 } | |
220 } | |
221 | |
222 void AbstractWorkGang::threads_do(ThreadClosure* tc) const { | |
223 assert(tc != NULL, "Null ThreadClosure"); | |
224 uint num_thr = total_workers(); | |
225 for (uint i = 0; i < num_thr; i++) { | |
226 tc->do_thread(gang_worker(i)); | |
227 } | |
228 } | |
229 | |
230 // GangWorker methods. | |
231 | |
232 GangWorker::GangWorker(AbstractWorkGang* gang, uint id) { | |
233 _gang = gang; | |
234 set_id(id); | |
235 set_name("Gang worker#%d (%s)", id, gang->name()); | |
236 } | |
237 | |
238 void GangWorker::run() { | |
239 initialize(); | |
240 loop(); | |
241 } | |
242 | |
243 void GangWorker::initialize() { | |
244 this->initialize_thread_local_storage(); | |
6197 | 245 this->record_stack_base_and_size(); |
0 | 246 assert(_gang != NULL, "No gang to run in"); |
247 os::set_priority(this, NearMaxPriority); | |
248 if (TraceWorkGang) { | |
249 tty->print_cr("Running gang worker for gang %s id %d", | |
250 gang()->name(), id()); | |
251 } | |
252 // The VM thread should not execute here because MutexLocker's are used | |
253 // as (opposed to MutexLockerEx's). | |
254 assert(!Thread::current()->is_VM_thread(), "VM thread should not be part" | |
255 " of a work gang"); | |
256 } | |
257 | |
258 void GangWorker::loop() { | |
259 int previous_sequence_number = 0; | |
260 Monitor* gang_monitor = gang()->monitor(); | |
261 for ( ; /* !terminate() */; ) { | |
262 WorkData data; | |
263 int part; // Initialized below. | |
264 { | |
265 // Grab the gang mutex. | |
266 MutexLocker ml(gang_monitor); | |
267 // Wait for something to do. | |
268 // Polling outside the while { wait } avoids missed notifies | |
269 // in the outer loop. | |
270 gang()->internal_worker_poll(&data); | |
271 if (TraceWorkGang) { | |
272 tty->print("Polled outside for work in gang %s worker %d", | |
273 gang()->name(), id()); | |
274 tty->print(" terminate: %s", | |
275 data.terminate() ? "true" : "false"); | |
276 tty->print(" sequence: %d (prev: %d)", | |
277 data.sequence_number(), previous_sequence_number); | |
278 if (data.task() != NULL) { | |
279 tty->print(" task: %s", data.task()->name()); | |
280 } else { | |
281 tty->print(" task: NULL"); | |
282 } | |
283 tty->cr(); | |
284 } | |
285 for ( ; /* break or return */; ) { | |
286 // Terminate if requested. | |
287 if (data.terminate()) { | |
288 gang()->internal_note_finish(); | |
289 gang_monitor->notify_all(); | |
290 return; | |
291 } | |
292 // Check for new work. | |
293 if ((data.task() != NULL) && | |
294 (data.sequence_number() != previous_sequence_number)) { | |
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295 if (gang()->needs_more_workers()) { |
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296 gang()->internal_note_start(); |
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297 gang_monitor->notify_all(); |
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298 part = gang()->started_workers() - 1; |
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299 break; |
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300 } |
0 | 301 } |
302 // Nothing to do. | |
303 gang_monitor->wait(/* no_safepoint_check */ true); | |
304 gang()->internal_worker_poll(&data); | |
305 if (TraceWorkGang) { | |
306 tty->print("Polled inside for work in gang %s worker %d", | |
307 gang()->name(), id()); | |
308 tty->print(" terminate: %s", | |
309 data.terminate() ? "true" : "false"); | |
310 tty->print(" sequence: %d (prev: %d)", | |
311 data.sequence_number(), previous_sequence_number); | |
312 if (data.task() != NULL) { | |
313 tty->print(" task: %s", data.task()->name()); | |
314 } else { | |
315 tty->print(" task: NULL"); | |
316 } | |
317 tty->cr(); | |
318 } | |
319 } | |
320 // Drop gang mutex. | |
321 } | |
322 if (TraceWorkGang) { | |
323 tty->print("Work for work gang %s id %d task %s part %d", | |
324 gang()->name(), id(), data.task()->name(), part); | |
325 } | |
326 assert(data.task() != NULL, "Got null task"); | |
327 data.task()->work(part); | |
328 { | |
329 if (TraceWorkGang) { | |
330 tty->print("Finish for work gang %s id %d task %s part %d", | |
331 gang()->name(), id(), data.task()->name(), part); | |
332 } | |
333 // Grab the gang mutex. | |
334 MutexLocker ml(gang_monitor); | |
335 gang()->internal_note_finish(); | |
336 // Tell the gang you are done. | |
337 gang_monitor->notify_all(); | |
338 // Drop the gang mutex. | |
339 } | |
340 previous_sequence_number = data.sequence_number(); | |
341 } | |
342 } | |
343 | |
344 bool GangWorker::is_GC_task_thread() const { | |
342 | 345 return gang()->are_GC_task_threads(); |
346 } | |
347 | |
348 bool GangWorker::is_ConcurrentGC_thread() const { | |
349 return gang()->are_ConcurrentGC_threads(); | |
0 | 350 } |
351 | |
352 void GangWorker::print_on(outputStream* st) const { | |
353 st->print("\"%s\" ", name()); | |
354 Thread::print_on(st); | |
355 st->cr(); | |
356 } | |
357 | |
358 // Printing methods | |
359 | |
360 const char* AbstractWorkGang::name() const { | |
361 return _name; | |
362 } | |
363 | |
364 #ifndef PRODUCT | |
365 | |
366 const char* AbstractGangTask::name() const { | |
367 return _name; | |
368 } | |
369 | |
370 #endif /* PRODUCT */ | |
371 | |
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372 // FlexibleWorkGang |
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373 |
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374 |
0 | 375 // *** WorkGangBarrierSync |
376 | |
377 WorkGangBarrierSync::WorkGangBarrierSync() | |
378 : _monitor(Mutex::safepoint, "work gang barrier sync", true), | |
342 | 379 _n_workers(0), _n_completed(0), _should_reset(false) { |
0 | 380 } |
381 | |
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382 WorkGangBarrierSync::WorkGangBarrierSync(uint n_workers, const char* name) |
0 | 383 : _monitor(Mutex::safepoint, name, true), |
342 | 384 _n_workers(n_workers), _n_completed(0), _should_reset(false) { |
0 | 385 } |
386 | |
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387 void WorkGangBarrierSync::set_n_workers(uint n_workers) { |
0 | 388 _n_workers = n_workers; |
389 _n_completed = 0; | |
342 | 390 _should_reset = false; |
0 | 391 } |
392 | |
393 void WorkGangBarrierSync::enter() { | |
394 MutexLockerEx x(monitor(), Mutex::_no_safepoint_check_flag); | |
342 | 395 if (should_reset()) { |
396 // The should_reset() was set and we are the first worker to enter | |
397 // the sync barrier. We will zero the n_completed() count which | |
398 // effectively resets the barrier. | |
399 zero_completed(); | |
400 set_should_reset(false); | |
401 } | |
0 | 402 inc_completed(); |
403 if (n_completed() == n_workers()) { | |
342 | 404 // At this point we would like to reset the barrier to be ready in |
405 // case it is used again. However, we cannot set n_completed() to | |
406 // 0, even after the notify_all(), given that some other workers | |
407 // might still be waiting for n_completed() to become == | |
408 // n_workers(). So, if we set n_completed() to 0, those workers | |
409 // will get stuck (as they will wake up, see that n_completed() != | |
410 // n_workers() and go back to sleep). Instead, we raise the | |
411 // should_reset() flag and the barrier will be reset the first | |
412 // time a worker enters it again. | |
413 set_should_reset(true); | |
0 | 414 monitor()->notify_all(); |
342 | 415 } else { |
0 | 416 while (n_completed() != n_workers()) { |
417 monitor()->wait(/* no_safepoint_check */ true); | |
418 } | |
419 } | |
420 } | |
421 | |
422 // SubTasksDone functions. | |
423 | |
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424 SubTasksDone::SubTasksDone(uint n) : |
0 | 425 _n_tasks(n), _n_threads(1), _tasks(NULL) { |
6197 | 426 _tasks = NEW_C_HEAP_ARRAY(uint, n, mtInternal); |
0 | 427 guarantee(_tasks != NULL, "alloc failure"); |
428 clear(); | |
429 } | |
430 | |
431 bool SubTasksDone::valid() { | |
432 return _tasks != NULL; | |
433 } | |
434 | |
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435 void SubTasksDone::set_n_threads(uint t) { |
0 | 436 assert(_claimed == 0 || _threads_completed == _n_threads, |
437 "should not be called while tasks are being processed!"); | |
438 _n_threads = (t == 0 ? 1 : t); | |
439 } | |
440 | |
441 void SubTasksDone::clear() { | |
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442 for (uint i = 0; i < _n_tasks; i++) { |
0 | 443 _tasks[i] = 0; |
444 } | |
445 _threads_completed = 0; | |
446 #ifdef ASSERT | |
447 _claimed = 0; | |
448 #endif | |
449 } | |
450 | |
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451 bool SubTasksDone::is_task_claimed(uint t) { |
0 | 452 assert(0 <= t && t < _n_tasks, "bad task id."); |
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453 uint old = _tasks[t]; |
0 | 454 if (old == 0) { |
455 old = Atomic::cmpxchg(1, &_tasks[t], 0); | |
456 } | |
457 assert(_tasks[t] == 1, "What else?"); | |
458 bool res = old != 0; | |
459 #ifdef ASSERT | |
460 if (!res) { | |
461 assert(_claimed < _n_tasks, "Too many tasks claimed; missing clear?"); | |
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462 Atomic::inc((volatile jint*) &_claimed); |
0 | 463 } |
464 #endif | |
465 return res; | |
466 } | |
467 | |
468 void SubTasksDone::all_tasks_completed() { | |
469 jint observed = _threads_completed; | |
470 jint old; | |
471 do { | |
472 old = observed; | |
473 observed = Atomic::cmpxchg(old+1, &_threads_completed, old); | |
474 } while (observed != old); | |
475 // If this was the last thread checking in, clear the tasks. | |
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476 if (observed+1 == (jint)_n_threads) clear(); |
0 | 477 } |
478 | |
479 | |
480 SubTasksDone::~SubTasksDone() { | |
6197 | 481 if (_tasks != NULL) FREE_C_HEAP_ARRAY(jint, _tasks, mtInternal); |
0 | 482 } |
483 | |
484 // *** SequentialSubTasksDone | |
485 | |
486 void SequentialSubTasksDone::clear() { | |
487 _n_tasks = _n_claimed = 0; | |
488 _n_threads = _n_completed = 0; | |
489 } | |
490 | |
491 bool SequentialSubTasksDone::valid() { | |
492 return _n_threads > 0; | |
493 } | |
494 | |
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495 bool SequentialSubTasksDone::is_task_claimed(uint& t) { |
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496 uint* n_claimed_ptr = &_n_claimed; |
0 | 497 t = *n_claimed_ptr; |
498 while (t < _n_tasks) { | |
499 jint res = Atomic::cmpxchg(t+1, n_claimed_ptr, t); | |
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500 if (res == (jint)t) { |
0 | 501 return false; |
502 } | |
503 t = *n_claimed_ptr; | |
504 } | |
505 return true; | |
506 } | |
507 | |
508 bool SequentialSubTasksDone::all_tasks_completed() { | |
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509 uint* n_completed_ptr = &_n_completed; |
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510 uint complete = *n_completed_ptr; |
0 | 511 while (true) { |
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512 uint res = Atomic::cmpxchg(complete+1, n_completed_ptr, complete); |
0 | 513 if (res == complete) { |
514 break; | |
515 } | |
516 complete = res; | |
517 } | |
518 if (complete+1 == _n_threads) { | |
519 clear(); | |
520 return true; | |
521 } | |
522 return false; | |
523 } | |
342 | 524 |
525 bool FreeIdSet::_stat_init = false; | |
526 FreeIdSet* FreeIdSet::_sets[NSets]; | |
527 bool FreeIdSet::_safepoint; | |
528 | |
529 FreeIdSet::FreeIdSet(int sz, Monitor* mon) : | |
530 _sz(sz), _mon(mon), _hd(0), _waiters(0), _index(-1), _claimed(0) | |
531 { | |
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532 _ids = NEW_C_HEAP_ARRAY(int, sz, mtInternal); |
342 | 533 for (int i = 0; i < sz; i++) _ids[i] = i+1; |
534 _ids[sz-1] = end_of_list; // end of list. | |
535 if (_stat_init) { | |
536 for (int j = 0; j < NSets; j++) _sets[j] = NULL; | |
537 _stat_init = true; | |
538 } | |
539 // Add to sets. (This should happen while the system is still single-threaded.) | |
540 for (int j = 0; j < NSets; j++) { | |
541 if (_sets[j] == NULL) { | |
542 _sets[j] = this; | |
543 _index = j; | |
544 break; | |
545 } | |
546 } | |
547 guarantee(_index != -1, "Too many FreeIdSets in use!"); | |
548 } | |
549 | |
550 FreeIdSet::~FreeIdSet() { | |
551 _sets[_index] = NULL; | |
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552 FREE_C_HEAP_ARRAY(int, _ids, mtInternal); |
342 | 553 } |
554 | |
555 void FreeIdSet::set_safepoint(bool b) { | |
556 _safepoint = b; | |
557 if (b) { | |
558 for (int j = 0; j < NSets; j++) { | |
559 if (_sets[j] != NULL && _sets[j]->_waiters > 0) { | |
560 Monitor* mon = _sets[j]->_mon; | |
561 mon->lock_without_safepoint_check(); | |
562 mon->notify_all(); | |
563 mon->unlock(); | |
564 } | |
565 } | |
566 } | |
567 } | |
568 | |
569 #define FID_STATS 0 | |
570 | |
571 int FreeIdSet::claim_par_id() { | |
572 #if FID_STATS | |
573 thread_t tslf = thr_self(); | |
574 tty->print("claim_par_id[%d]: sz = %d, claimed = %d\n", tslf, _sz, _claimed); | |
575 #endif | |
576 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); | |
577 while (!_safepoint && _hd == end_of_list) { | |
578 _waiters++; | |
579 #if FID_STATS | |
580 if (_waiters > 5) { | |
581 tty->print("claim_par_id waiting[%d]: %d waiters, %d claimed.\n", | |
582 tslf, _waiters, _claimed); | |
583 } | |
584 #endif | |
585 _mon->wait(Mutex::_no_safepoint_check_flag); | |
586 _waiters--; | |
587 } | |
588 if (_hd == end_of_list) { | |
589 #if FID_STATS | |
590 tty->print("claim_par_id[%d]: returning EOL.\n", tslf); | |
591 #endif | |
592 return -1; | |
593 } else { | |
594 int res = _hd; | |
595 _hd = _ids[res]; | |
596 _ids[res] = claimed; // For debugging. | |
597 _claimed++; | |
598 #if FID_STATS | |
599 tty->print("claim_par_id[%d]: returning %d, claimed = %d.\n", | |
600 tslf, res, _claimed); | |
601 #endif | |
602 return res; | |
603 } | |
604 } | |
605 | |
606 bool FreeIdSet::claim_perm_id(int i) { | |
607 assert(0 <= i && i < _sz, "Out of range."); | |
608 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); | |
609 int prev = end_of_list; | |
610 int cur = _hd; | |
611 while (cur != end_of_list) { | |
612 if (cur == i) { | |
613 if (prev == end_of_list) { | |
614 _hd = _ids[cur]; | |
615 } else { | |
616 _ids[prev] = _ids[cur]; | |
617 } | |
618 _ids[cur] = claimed; | |
619 _claimed++; | |
620 return true; | |
621 } else { | |
622 prev = cur; | |
623 cur = _ids[cur]; | |
624 } | |
625 } | |
626 return false; | |
627 | |
628 } | |
629 | |
630 void FreeIdSet::release_par_id(int id) { | |
631 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); | |
632 assert(_ids[id] == claimed, "Precondition."); | |
633 _ids[id] = _hd; | |
634 _hd = id; | |
635 _claimed--; | |
636 #if FID_STATS | |
637 tty->print("[%d] release_par_id(%d), waiters =%d, claimed = %d.\n", | |
638 thr_self(), id, _waiters, _claimed); | |
639 #endif | |
640 if (_waiters > 0) | |
641 // Notify all would be safer, but this is OK, right? | |
642 _mon->notify_all(); | |
643 } |