Mercurial > hg > truffle
annotate src/share/vm/utilities/workgroup.cpp @ 21836:b517d3a9aebf jdk8u31-b31
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author | asaha |
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date | Thu, 18 Dec 2014 14:30:02 -0800 |
parents | 487f09bf44e0 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, 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 |
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31 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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32 |
0 | 33 // Definitions of WorkGang methods. |
34 | |
35 AbstractWorkGang::AbstractWorkGang(const char* name, | |
342 | 36 bool are_GC_task_threads, |
37 bool are_ConcurrentGC_threads) : | |
0 | 38 _name(name), |
342 | 39 _are_GC_task_threads(are_GC_task_threads), |
40 _are_ConcurrentGC_threads(are_ConcurrentGC_threads) { | |
41 | |
42 assert(!(are_GC_task_threads && are_ConcurrentGC_threads), | |
43 "They cannot both be STW GC and Concurrent threads" ); | |
44 | |
0 | 45 // Other initialization. |
46 _monitor = new Monitor(/* priority */ Mutex::leaf, | |
47 /* name */ "WorkGroup monitor", | |
342 | 48 /* allow_vm_block */ are_GC_task_threads); |
0 | 49 assert(monitor() != NULL, "Failed to allocate monitor"); |
50 _terminate = false; | |
51 _task = NULL; | |
52 _sequence_number = 0; | |
53 _started_workers = 0; | |
54 _finished_workers = 0; | |
55 } | |
56 | |
57 WorkGang::WorkGang(const char* name, | |
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58 uint workers, |
342 | 59 bool are_GC_task_threads, |
60 bool are_ConcurrentGC_threads) : | |
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61 AbstractWorkGang(name, are_GC_task_threads, are_ConcurrentGC_threads) { |
0 | 62 _total_workers = workers; |
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63 } |
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64 |
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65 GangWorker* WorkGang::allocate_worker(uint which) { |
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66 GangWorker* new_worker = new GangWorker(this, which); |
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67 return new_worker; |
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68 } |
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69 |
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70 // The current implementation will exit if the allocation |
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71 // of any worker fails. Still, return a boolean so that |
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72 // a future implementation can possibly do a partial |
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73 // initialization of the workers and report such to the |
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74 // caller. |
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75 bool WorkGang::initialize_workers() { |
342 | 76 |
0 | 77 if (TraceWorkGang) { |
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78 tty->print_cr("Constructing work gang %s with %d threads", |
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79 name(), |
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80 total_workers()); |
0 | 81 } |
6197 | 82 _gang_workers = NEW_C_HEAP_ARRAY(GangWorker*, total_workers(), mtInternal); |
342 | 83 if (gang_workers() == NULL) { |
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84 vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create GangWorker array."); |
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85 return false; |
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86 } |
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87 os::ThreadType worker_type; |
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88 if (are_ConcurrentGC_threads()) { |
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89 worker_type = os::cgc_thread; |
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90 } else { |
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91 worker_type = os::pgc_thread; |
342 | 92 } |
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93 for (uint worker = 0; worker < total_workers(); worker += 1) { |
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94 GangWorker* new_worker = allocate_worker(worker); |
0 | 95 assert(new_worker != NULL, "Failed to allocate GangWorker"); |
96 _gang_workers[worker] = new_worker; | |
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97 if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) { |
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98 vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, |
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99 "Cannot create worker GC thread. Out of system resources."); |
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100 return false; |
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101 } |
0 | 102 if (!DisableStartThread) { |
103 os::start_thread(new_worker); | |
104 } | |
105 } | |
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106 return true; |
0 | 107 } |
108 | |
109 AbstractWorkGang::~AbstractWorkGang() { | |
110 if (TraceWorkGang) { | |
111 tty->print_cr("Destructing work gang %s", name()); | |
112 } | |
113 stop(); // stop all the workers | |
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114 for (uint worker = 0; worker < total_workers(); worker += 1) { |
0 | 115 delete gang_worker(worker); |
116 } | |
117 delete gang_workers(); | |
118 delete monitor(); | |
119 } | |
120 | |
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121 GangWorker* AbstractWorkGang::gang_worker(uint i) const { |
0 | 122 // Array index bounds checking. |
123 GangWorker* result = NULL; | |
124 assert(gang_workers() != NULL, "No workers for indexing"); | |
125 assert(((i >= 0) && (i < total_workers())), "Worker index out of bounds"); | |
126 result = _gang_workers[i]; | |
127 assert(result != NULL, "Indexing to null worker"); | |
128 return result; | |
129 } | |
130 | |
131 void WorkGang::run_task(AbstractGangTask* task) { | |
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132 run_task(task, total_workers()); |
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133 } |
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134 |
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135 void WorkGang::run_task(AbstractGangTask* task, uint no_of_parallel_workers) { |
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136 task->set_for_termination(no_of_parallel_workers); |
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137 |
0 | 138 // This thread is executed by the VM thread which does not block |
139 // on ordinary MutexLocker's. | |
140 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
141 if (TraceWorkGang) { | |
142 tty->print_cr("Running work gang %s task %s", name(), task->name()); | |
143 } | |
144 // Tell all the workers to run a task. | |
145 assert(task != NULL, "Running a null task"); | |
146 // Initialize. | |
147 _task = task; | |
148 _sequence_number += 1; | |
149 _started_workers = 0; | |
150 _finished_workers = 0; | |
151 // Tell the workers to get to work. | |
152 monitor()->notify_all(); | |
153 // Wait for them to be finished | |
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154 while (finished_workers() < no_of_parallel_workers) { |
0 | 155 if (TraceWorkGang) { |
156 tty->print_cr("Waiting in work gang %s: %d/%d finished sequence %d", | |
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157 name(), finished_workers(), no_of_parallel_workers, |
0 | 158 _sequence_number); |
159 } | |
160 monitor()->wait(/* no_safepoint_check */ true); | |
161 } | |
162 _task = NULL; | |
163 if (TraceWorkGang) { | |
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164 tty->print_cr("\nFinished work gang %s: %d/%d sequence %d", |
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165 name(), finished_workers(), no_of_parallel_workers, |
0 | 166 _sequence_number); |
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167 Thread* me = Thread::current(); |
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168 tty->print_cr(" T: 0x%x VM_thread: %d", me, me->is_VM_thread()); |
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169 } |
0 | 170 } |
171 | |
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172 void FlexibleWorkGang::run_task(AbstractGangTask* task) { |
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173 // If active_workers() is passed, _finished_workers |
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174 // must only be incremented for workers that find non_null |
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175 // work (as opposed to all those that just check that the |
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176 // task is not null). |
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177 WorkGang::run_task(task, (uint) active_workers()); |
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178 } |
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179 |
0 | 180 void AbstractWorkGang::stop() { |
181 // Tell all workers to terminate, then wait for them to become inactive. | |
182 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag); | |
183 if (TraceWorkGang) { | |
184 tty->print_cr("Stopping work gang %s task %s", name(), task()->name()); | |
185 } | |
186 _task = NULL; | |
187 _terminate = true; | |
188 monitor()->notify_all(); | |
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189 while (finished_workers() < active_workers()) { |
0 | 190 if (TraceWorkGang) { |
191 tty->print_cr("Waiting in work gang %s: %d/%d finished", | |
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192 name(), finished_workers(), active_workers()); |
0 | 193 } |
194 monitor()->wait(/* no_safepoint_check */ true); | |
195 } | |
196 } | |
197 | |
198 void AbstractWorkGang::internal_worker_poll(WorkData* data) const { | |
199 assert(monitor()->owned_by_self(), "worker_poll is an internal method"); | |
200 assert(data != NULL, "worker data is null"); | |
201 data->set_terminate(terminate()); | |
202 data->set_task(task()); | |
203 data->set_sequence_number(sequence_number()); | |
204 } | |
205 | |
206 void AbstractWorkGang::internal_note_start() { | |
207 assert(monitor()->owned_by_self(), "note_finish is an internal method"); | |
208 _started_workers += 1; | |
209 } | |
210 | |
211 void AbstractWorkGang::internal_note_finish() { | |
212 assert(monitor()->owned_by_self(), "note_finish is an internal method"); | |
213 _finished_workers += 1; | |
214 } | |
215 | |
216 void AbstractWorkGang::print_worker_threads_on(outputStream* st) const { | |
217 uint num_thr = total_workers(); | |
218 for (uint i = 0; i < num_thr; i++) { | |
219 gang_worker(i)->print_on(st); | |
220 st->cr(); | |
221 } | |
222 } | |
223 | |
224 void AbstractWorkGang::threads_do(ThreadClosure* tc) const { | |
225 assert(tc != NULL, "Null ThreadClosure"); | |
226 uint num_thr = total_workers(); | |
227 for (uint i = 0; i < num_thr; i++) { | |
228 tc->do_thread(gang_worker(i)); | |
229 } | |
230 } | |
231 | |
232 // GangWorker methods. | |
233 | |
234 GangWorker::GangWorker(AbstractWorkGang* gang, uint id) { | |
235 _gang = gang; | |
236 set_id(id); | |
237 set_name("Gang worker#%d (%s)", id, gang->name()); | |
238 } | |
239 | |
240 void GangWorker::run() { | |
241 initialize(); | |
242 loop(); | |
243 } | |
244 | |
245 void GangWorker::initialize() { | |
246 this->initialize_thread_local_storage(); | |
6197 | 247 this->record_stack_base_and_size(); |
0 | 248 assert(_gang != NULL, "No gang to run in"); |
249 os::set_priority(this, NearMaxPriority); | |
250 if (TraceWorkGang) { | |
251 tty->print_cr("Running gang worker for gang %s id %d", | |
252 gang()->name(), id()); | |
253 } | |
254 // The VM thread should not execute here because MutexLocker's are used | |
255 // as (opposed to MutexLockerEx's). | |
256 assert(!Thread::current()->is_VM_thread(), "VM thread should not be part" | |
257 " of a work gang"); | |
258 } | |
259 | |
260 void GangWorker::loop() { | |
261 int previous_sequence_number = 0; | |
262 Monitor* gang_monitor = gang()->monitor(); | |
263 for ( ; /* !terminate() */; ) { | |
264 WorkData data; | |
265 int part; // Initialized below. | |
266 { | |
267 // Grab the gang mutex. | |
268 MutexLocker ml(gang_monitor); | |
269 // Wait for something to do. | |
270 // Polling outside the while { wait } avoids missed notifies | |
271 // in the outer loop. | |
272 gang()->internal_worker_poll(&data); | |
273 if (TraceWorkGang) { | |
274 tty->print("Polled outside for work in gang %s worker %d", | |
275 gang()->name(), id()); | |
276 tty->print(" terminate: %s", | |
277 data.terminate() ? "true" : "false"); | |
278 tty->print(" sequence: %d (prev: %d)", | |
279 data.sequence_number(), previous_sequence_number); | |
280 if (data.task() != NULL) { | |
281 tty->print(" task: %s", data.task()->name()); | |
282 } else { | |
283 tty->print(" task: NULL"); | |
284 } | |
285 tty->cr(); | |
286 } | |
287 for ( ; /* break or return */; ) { | |
288 // Terminate if requested. | |
289 if (data.terminate()) { | |
290 gang()->internal_note_finish(); | |
291 gang_monitor->notify_all(); | |
292 return; | |
293 } | |
294 // Check for new work. | |
295 if ((data.task() != NULL) && | |
296 (data.sequence_number() != previous_sequence_number)) { | |
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297 if (gang()->needs_more_workers()) { |
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298 gang()->internal_note_start(); |
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299 gang_monitor->notify_all(); |
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300 part = gang()->started_workers() - 1; |
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301 break; |
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302 } |
0 | 303 } |
304 // Nothing to do. | |
305 gang_monitor->wait(/* no_safepoint_check */ true); | |
306 gang()->internal_worker_poll(&data); | |
307 if (TraceWorkGang) { | |
308 tty->print("Polled inside for work in gang %s worker %d", | |
309 gang()->name(), id()); | |
310 tty->print(" terminate: %s", | |
311 data.terminate() ? "true" : "false"); | |
312 tty->print(" sequence: %d (prev: %d)", | |
313 data.sequence_number(), previous_sequence_number); | |
314 if (data.task() != NULL) { | |
315 tty->print(" task: %s", data.task()->name()); | |
316 } else { | |
317 tty->print(" task: NULL"); | |
318 } | |
319 tty->cr(); | |
320 } | |
321 } | |
322 // Drop gang mutex. | |
323 } | |
324 if (TraceWorkGang) { | |
325 tty->print("Work for work gang %s id %d task %s part %d", | |
326 gang()->name(), id(), data.task()->name(), part); | |
327 } | |
328 assert(data.task() != NULL, "Got null task"); | |
329 data.task()->work(part); | |
330 { | |
331 if (TraceWorkGang) { | |
332 tty->print("Finish for work gang %s id %d task %s part %d", | |
333 gang()->name(), id(), data.task()->name(), part); | |
334 } | |
335 // Grab the gang mutex. | |
336 MutexLocker ml(gang_monitor); | |
337 gang()->internal_note_finish(); | |
338 // Tell the gang you are done. | |
339 gang_monitor->notify_all(); | |
340 // Drop the gang mutex. | |
341 } | |
342 previous_sequence_number = data.sequence_number(); | |
343 } | |
344 } | |
345 | |
346 bool GangWorker::is_GC_task_thread() const { | |
342 | 347 return gang()->are_GC_task_threads(); |
348 } | |
349 | |
350 bool GangWorker::is_ConcurrentGC_thread() const { | |
351 return gang()->are_ConcurrentGC_threads(); | |
0 | 352 } |
353 | |
354 void GangWorker::print_on(outputStream* st) const { | |
355 st->print("\"%s\" ", name()); | |
356 Thread::print_on(st); | |
357 st->cr(); | |
358 } | |
359 | |
360 // Printing methods | |
361 | |
362 const char* AbstractWorkGang::name() const { | |
363 return _name; | |
364 } | |
365 | |
366 #ifndef PRODUCT | |
367 | |
368 const char* AbstractGangTask::name() const { | |
369 return _name; | |
370 } | |
371 | |
372 #endif /* PRODUCT */ | |
373 | |
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374 // FlexibleWorkGang |
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375 |
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376 |
0 | 377 // *** WorkGangBarrierSync |
378 | |
379 WorkGangBarrierSync::WorkGangBarrierSync() | |
380 : _monitor(Mutex::safepoint, "work gang barrier sync", true), | |
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381 _n_workers(0), _n_completed(0), _should_reset(false), _aborted(false) { |
0 | 382 } |
383 | |
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384 WorkGangBarrierSync::WorkGangBarrierSync(uint n_workers, const char* name) |
0 | 385 : _monitor(Mutex::safepoint, name, true), |
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386 _n_workers(n_workers), _n_completed(0), _should_reset(false), _aborted(false) { |
0 | 387 } |
388 | |
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389 void WorkGangBarrierSync::set_n_workers(uint n_workers) { |
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390 _n_workers = n_workers; |
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391 _n_completed = 0; |
342 | 392 _should_reset = false; |
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393 _aborted = false; |
0 | 394 } |
395 | |
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396 bool WorkGangBarrierSync::enter() { |
0 | 397 MutexLockerEx x(monitor(), Mutex::_no_safepoint_check_flag); |
342 | 398 if (should_reset()) { |
399 // The should_reset() was set and we are the first worker to enter | |
400 // the sync barrier. We will zero the n_completed() count which | |
401 // effectively resets the barrier. | |
402 zero_completed(); | |
403 set_should_reset(false); | |
404 } | |
0 | 405 inc_completed(); |
406 if (n_completed() == n_workers()) { | |
342 | 407 // At this point we would like to reset the barrier to be ready in |
408 // case it is used again. However, we cannot set n_completed() to | |
409 // 0, even after the notify_all(), given that some other workers | |
410 // might still be waiting for n_completed() to become == | |
411 // n_workers(). So, if we set n_completed() to 0, those workers | |
412 // will get stuck (as they will wake up, see that n_completed() != | |
413 // n_workers() and go back to sleep). Instead, we raise the | |
414 // should_reset() flag and the barrier will be reset the first | |
415 // time a worker enters it again. | |
416 set_should_reset(true); | |
0 | 417 monitor()->notify_all(); |
342 | 418 } else { |
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419 while (n_completed() != n_workers() && !aborted()) { |
0 | 420 monitor()->wait(/* no_safepoint_check */ true); |
421 } | |
422 } | |
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423 return !aborted(); |
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424 } |
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425 |
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426 void WorkGangBarrierSync::abort() { |
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427 MutexLockerEx x(monitor(), Mutex::_no_safepoint_check_flag); |
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428 set_aborted(); |
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429 monitor()->notify_all(); |
0 | 430 } |
431 | |
432 // SubTasksDone functions. | |
433 | |
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434 SubTasksDone::SubTasksDone(uint n) : |
0 | 435 _n_tasks(n), _n_threads(1), _tasks(NULL) { |
6197 | 436 _tasks = NEW_C_HEAP_ARRAY(uint, n, mtInternal); |
0 | 437 guarantee(_tasks != NULL, "alloc failure"); |
438 clear(); | |
439 } | |
440 | |
441 bool SubTasksDone::valid() { | |
442 return _tasks != NULL; | |
443 } | |
444 | |
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445 void SubTasksDone::set_n_threads(uint t) { |
0 | 446 assert(_claimed == 0 || _threads_completed == _n_threads, |
447 "should not be called while tasks are being processed!"); | |
448 _n_threads = (t == 0 ? 1 : t); | |
449 } | |
450 | |
451 void SubTasksDone::clear() { | |
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452 for (uint i = 0; i < _n_tasks; i++) { |
0 | 453 _tasks[i] = 0; |
454 } | |
455 _threads_completed = 0; | |
456 #ifdef ASSERT | |
457 _claimed = 0; | |
458 #endif | |
459 } | |
460 | |
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461 bool SubTasksDone::is_task_claimed(uint t) { |
0 | 462 assert(0 <= t && t < _n_tasks, "bad task id."); |
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463 uint old = _tasks[t]; |
0 | 464 if (old == 0) { |
465 old = Atomic::cmpxchg(1, &_tasks[t], 0); | |
466 } | |
467 assert(_tasks[t] == 1, "What else?"); | |
468 bool res = old != 0; | |
469 #ifdef ASSERT | |
470 if (!res) { | |
471 assert(_claimed < _n_tasks, "Too many tasks claimed; missing clear?"); | |
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472 Atomic::inc((volatile jint*) &_claimed); |
0 | 473 } |
474 #endif | |
475 return res; | |
476 } | |
477 | |
478 void SubTasksDone::all_tasks_completed() { | |
479 jint observed = _threads_completed; | |
480 jint old; | |
481 do { | |
482 old = observed; | |
483 observed = Atomic::cmpxchg(old+1, &_threads_completed, old); | |
484 } while (observed != old); | |
485 // If this was the last thread checking in, clear the tasks. | |
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486 if (observed+1 == (jint)_n_threads) clear(); |
0 | 487 } |
488 | |
489 | |
490 SubTasksDone::~SubTasksDone() { | |
6197 | 491 if (_tasks != NULL) FREE_C_HEAP_ARRAY(jint, _tasks, mtInternal); |
0 | 492 } |
493 | |
494 // *** SequentialSubTasksDone | |
495 | |
496 void SequentialSubTasksDone::clear() { | |
497 _n_tasks = _n_claimed = 0; | |
498 _n_threads = _n_completed = 0; | |
499 } | |
500 | |
501 bool SequentialSubTasksDone::valid() { | |
502 return _n_threads > 0; | |
503 } | |
504 | |
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505 bool SequentialSubTasksDone::is_task_claimed(uint& t) { |
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506 uint* n_claimed_ptr = &_n_claimed; |
0 | 507 t = *n_claimed_ptr; |
508 while (t < _n_tasks) { | |
509 jint res = Atomic::cmpxchg(t+1, n_claimed_ptr, t); | |
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510 if (res == (jint)t) { |
0 | 511 return false; |
512 } | |
513 t = *n_claimed_ptr; | |
514 } | |
515 return true; | |
516 } | |
517 | |
518 bool SequentialSubTasksDone::all_tasks_completed() { | |
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519 uint* n_completed_ptr = &_n_completed; |
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520 uint complete = *n_completed_ptr; |
0 | 521 while (true) { |
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522 uint res = Atomic::cmpxchg(complete+1, n_completed_ptr, complete); |
0 | 523 if (res == complete) { |
524 break; | |
525 } | |
526 complete = res; | |
527 } | |
528 if (complete+1 == _n_threads) { | |
529 clear(); | |
530 return true; | |
531 } | |
532 return false; | |
533 } | |
342 | 534 |
535 bool FreeIdSet::_stat_init = false; | |
536 FreeIdSet* FreeIdSet::_sets[NSets]; | |
537 bool FreeIdSet::_safepoint; | |
538 | |
539 FreeIdSet::FreeIdSet(int sz, Monitor* mon) : | |
540 _sz(sz), _mon(mon), _hd(0), _waiters(0), _index(-1), _claimed(0) | |
541 { | |
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542 _ids = NEW_C_HEAP_ARRAY(int, sz, mtInternal); |
342 | 543 for (int i = 0; i < sz; i++) _ids[i] = i+1; |
544 _ids[sz-1] = end_of_list; // end of list. | |
545 if (_stat_init) { | |
546 for (int j = 0; j < NSets; j++) _sets[j] = NULL; | |
547 _stat_init = true; | |
548 } | |
549 // Add to sets. (This should happen while the system is still single-threaded.) | |
550 for (int j = 0; j < NSets; j++) { | |
551 if (_sets[j] == NULL) { | |
552 _sets[j] = this; | |
553 _index = j; | |
554 break; | |
555 } | |
556 } | |
557 guarantee(_index != -1, "Too many FreeIdSets in use!"); | |
558 } | |
559 | |
560 FreeIdSet::~FreeIdSet() { | |
561 _sets[_index] = NULL; | |
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562 FREE_C_HEAP_ARRAY(int, _ids, mtInternal); |
342 | 563 } |
564 | |
565 void FreeIdSet::set_safepoint(bool b) { | |
566 _safepoint = b; | |
567 if (b) { | |
568 for (int j = 0; j < NSets; j++) { | |
569 if (_sets[j] != NULL && _sets[j]->_waiters > 0) { | |
570 Monitor* mon = _sets[j]->_mon; | |
571 mon->lock_without_safepoint_check(); | |
572 mon->notify_all(); | |
573 mon->unlock(); | |
574 } | |
575 } | |
576 } | |
577 } | |
578 | |
579 #define FID_STATS 0 | |
580 | |
581 int FreeIdSet::claim_par_id() { | |
582 #if FID_STATS | |
583 thread_t tslf = thr_self(); | |
584 tty->print("claim_par_id[%d]: sz = %d, claimed = %d\n", tslf, _sz, _claimed); | |
585 #endif | |
586 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); | |
587 while (!_safepoint && _hd == end_of_list) { | |
588 _waiters++; | |
589 #if FID_STATS | |
590 if (_waiters > 5) { | |
591 tty->print("claim_par_id waiting[%d]: %d waiters, %d claimed.\n", | |
592 tslf, _waiters, _claimed); | |
593 } | |
594 #endif | |
595 _mon->wait(Mutex::_no_safepoint_check_flag); | |
596 _waiters--; | |
597 } | |
598 if (_hd == end_of_list) { | |
599 #if FID_STATS | |
600 tty->print("claim_par_id[%d]: returning EOL.\n", tslf); | |
601 #endif | |
602 return -1; | |
603 } else { | |
604 int res = _hd; | |
605 _hd = _ids[res]; | |
606 _ids[res] = claimed; // For debugging. | |
607 _claimed++; | |
608 #if FID_STATS | |
609 tty->print("claim_par_id[%d]: returning %d, claimed = %d.\n", | |
610 tslf, res, _claimed); | |
611 #endif | |
612 return res; | |
613 } | |
614 } | |
615 | |
616 bool FreeIdSet::claim_perm_id(int i) { | |
617 assert(0 <= i && i < _sz, "Out of range."); | |
618 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); | |
619 int prev = end_of_list; | |
620 int cur = _hd; | |
621 while (cur != end_of_list) { | |
622 if (cur == i) { | |
623 if (prev == end_of_list) { | |
624 _hd = _ids[cur]; | |
625 } else { | |
626 _ids[prev] = _ids[cur]; | |
627 } | |
628 _ids[cur] = claimed; | |
629 _claimed++; | |
630 return true; | |
631 } else { | |
632 prev = cur; | |
633 cur = _ids[cur]; | |
634 } | |
635 } | |
636 return false; | |
637 | |
638 } | |
639 | |
640 void FreeIdSet::release_par_id(int id) { | |
641 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag); | |
642 assert(_ids[id] == claimed, "Precondition."); | |
643 _ids[id] = _hd; | |
644 _hd = id; | |
645 _claimed--; | |
646 #if FID_STATS | |
647 tty->print("[%d] release_par_id(%d), waiters =%d, claimed = %d.\n", | |
648 thr_self(), id, _waiters, _claimed); | |
649 #endif | |
650 if (_waiters > 0) | |
651 // Notify all would be safer, but this is OK, right? | |
652 _mon->notify_all(); | |
653 } |