6 |
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package jsr166y; |
8 |
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9 |
– |
import java.util.concurrent.*; |
10 |
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|
9 |
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import java.util.ArrayList; |
10 |
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import java.util.Arrays; |
11 |
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import java.util.Collection; |
12 |
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import java.util.Collections; |
13 |
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import java.util.List; |
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+ |
import java.util.concurrent.AbstractExecutorService; |
15 |
+ |
import java.util.concurrent.Callable; |
16 |
+ |
import java.util.concurrent.ExecutorService; |
17 |
+ |
import java.util.concurrent.Future; |
18 |
+ |
import java.util.concurrent.RejectedExecutionException; |
19 |
+ |
import java.util.concurrent.RunnableFuture; |
20 |
+ |
import java.util.concurrent.TimeUnit; |
21 |
+ |
import java.util.concurrent.TimeoutException; |
22 |
+ |
import java.util.concurrent.atomic.AtomicInteger; |
23 |
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import java.util.concurrent.locks.LockSupport; |
24 |
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import java.util.concurrent.locks.ReentrantLock; |
18 |
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import java.util.concurrent.atomic.AtomicInteger; |
19 |
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import java.util.concurrent.CountDownLatch; |
25 |
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|
26 |
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/** |
27 |
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* An {@link ExecutorService} for running {@link ForkJoinTask}s. |
306 |
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* about the same time as another is needlessly being created. We |
307 |
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* counteract this and related slop in part by requiring resumed |
308 |
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* spares to immediately recheck (in preStep) to see whether they |
309 |
< |
* they should re-suspend. |
309 |
> |
* should re-suspend. |
310 |
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* |
311 |
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* 6. Killing off unneeded workers. A timeout mechanism is used to |
312 |
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* shed unused workers: The oldest (first) event queue waiter uses |
435 |
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|
436 |
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/** |
437 |
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* The wakeup interval (in nanoseconds) for the oldest worker |
438 |
< |
* worker waiting for an event invokes tryShutdownUnusedWorker to shrink |
439 |
< |
* the number of workers. The exact value does not matter too |
440 |
< |
* much, but should be long enough to slowly release resources |
441 |
< |
* during long periods without use without disrupting normal use. |
438 |
> |
* waiting for an event to invoke tryShutdownUnusedWorker to |
439 |
> |
* shrink the number of workers. The exact value does not matter |
440 |
> |
* too much. It must be short enough to release resources during |
441 |
> |
* sustained periods of idleness, but not so short that threads |
442 |
> |
* are continually re-created. |
443 |
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*/ |
444 |
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private static final long SHRINK_RATE_NANOS = |
445 |
|
30L * 1000L * 1000L * 1000L; // 2 per minute |
522 |
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* Lifecycle control. The low word contains the number of workers |
523 |
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* that are (probably) executing tasks. This value is atomically |
524 |
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* incremented before a worker gets a task to run, and decremented |
525 |
< |
* when worker has no tasks and cannot find any. Bits 16-18 |
525 |
> |
* when a worker has no tasks and cannot find any. Bits 16-18 |
526 |
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* contain runLevel value. When all are zero, the pool is |
527 |
|
* running. Level transitions are monotonic (running -> shutdown |
528 |
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* -> terminating -> terminated) so each transition adds a bit. |
611 |
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* (rarely) necessary when other count updates lag. |
612 |
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* |
613 |
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* @param dr -- either zero or ONE_RUNNING |
614 |
< |
* @param dt == either zero or ONE_TOTAL |
614 |
> |
* @param dt -- either zero or ONE_TOTAL |
615 |
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*/ |
616 |
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private void decrementWorkerCounts(int dr, int dt) { |
617 |
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for (;;) { |
680 |
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} |
681 |
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|
682 |
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/** |
683 |
< |
* Nulls out record of worker in workers array |
683 |
> |
* Nulls out record of worker in workers array. |
684 |
|
*/ |
685 |
|
private void forgetWorker(ForkJoinWorkerThread w) { |
686 |
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int idx = w.poolIndex; |
705 |
|
*/ |
706 |
|
final void workerTerminated(ForkJoinWorkerThread w) { |
707 |
|
forgetWorker(w); |
708 |
< |
decrementWorkerCounts(w.isTrimmed()? 0 : ONE_RUNNING, ONE_TOTAL); |
708 |
> |
decrementWorkerCounts(w.isTrimmed() ? 0 : ONE_RUNNING, ONE_TOTAL); |
709 |
|
while (w.stealCount != 0) // collect final count |
710 |
|
tryAccumulateStealCount(w); |
711 |
|
tryTerminate(false); |
791 |
|
if (tryAccumulateStealCount(w)) { // transfer while idle |
792 |
|
boolean untimed = (w.nextWaiter != 0L || |
793 |
|
(workerCounts & RUNNING_COUNT_MASK) <= 1); |
794 |
< |
long startTime = untimed? 0 : System.nanoTime(); |
794 |
> |
long startTime = untimed ? 0 : System.nanoTime(); |
795 |
|
Thread.interrupted(); // clear/ignore interrupt |
796 |
< |
if (eventCount != ec || w.runState != 0 || |
797 |
< |
runState >= TERMINATING) // recheck after clear |
792 |
< |
break; |
796 |
> |
if (eventCount != ec || w.isTerminating()) |
797 |
> |
break; // recheck after clear |
798 |
|
if (untimed) |
799 |
|
LockSupport.park(w); |
800 |
|
else { |
801 |
|
LockSupport.parkNanos(w, SHRINK_RATE_NANOS); |
802 |
< |
if (eventCount != ec || w.runState != 0 || |
798 |
< |
runState >= TERMINATING) |
802 |
> |
if (eventCount != ec || w.isTerminating()) |
803 |
|
break; |
804 |
|
if (System.nanoTime() - startTime >= SHRINK_RATE_NANOS) |
805 |
|
tryShutdownUnusedWorker(ec); |
811 |
|
// Maintaining parallelism |
812 |
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|
813 |
|
/** |
814 |
< |
* Pushes worker onto the spare stack |
814 |
> |
* Pushes worker onto the spare stack. |
815 |
|
*/ |
816 |
|
final void pushSpare(ForkJoinWorkerThread w) { |
817 |
|
int ns = (++w.spareCount << SPARE_COUNT_SHIFT) | (w.poolIndex + 1); |
867 |
|
UNSAFE.compareAndSwapInt(this, workerCountsOffset, wc, |
868 |
|
wc + (ONE_RUNNING|ONE_TOTAL))) { |
869 |
|
ForkJoinWorkerThread w = null; |
870 |
+ |
Throwable fail = null; |
871 |
|
try { |
872 |
|
w = factory.newThread(this); |
873 |
< |
} finally { // adjust on null or exceptional factory return |
874 |
< |
if (w == null) { |
870 |
< |
decrementWorkerCounts(ONE_RUNNING, ONE_TOTAL); |
871 |
< |
tryTerminate(false); // handle failure during shutdown |
872 |
< |
} |
873 |
> |
} catch (Throwable ex) { |
874 |
> |
fail = ex; |
875 |
|
} |
876 |
< |
if (w == null) |
876 |
> |
if (w == null) { // null or exceptional factory return |
877 |
> |
decrementWorkerCounts(ONE_RUNNING, ONE_TOTAL); |
878 |
> |
tryTerminate(false); // handle failure during shutdown |
879 |
> |
// If originating from an external caller, |
880 |
> |
// propagate exception, else ignore |
881 |
> |
if (fail != null && runState < TERMINATING && |
882 |
> |
!(Thread.currentThread() instanceof |
883 |
> |
ForkJoinWorkerThread)) |
884 |
> |
UNSAFE.throwException(fail); |
885 |
|
break; |
886 |
+ |
} |
887 |
|
w.start(recordWorker(w), ueh); |
888 |
|
if ((workerCounts >>> TOTAL_COUNT_SHIFT) >= pc) { |
889 |
|
int c; // advance event count |
972 |
|
boolean active = w.active; |
973 |
|
boolean inactivate = false; |
974 |
|
int pc = parallelism; |
975 |
< |
int rs; |
976 |
< |
while (w.runState == 0 && (rs = runState) < TERMINATING) { |
975 |
> |
while (w.runState == 0) { |
976 |
> |
int rs = runState; |
977 |
> |
if (rs >= TERMINATING) { // propagate shutdown |
978 |
> |
w.shutdown(); |
979 |
> |
break; |
980 |
> |
} |
981 |
|
if ((inactivate || (active && (rs & ACTIVE_COUNT_MASK) >= pc)) && |
982 |
|
UNSAFE.compareAndSwapInt(this, runStateOffset, rs, rs - 1)) |
983 |
|
inactivate = active = w.active = false; |
1014 |
|
* |
1015 |
|
* @param joinMe the task to join |
1016 |
|
* @param worker the current worker thread |
1017 |
+ |
* @param timed true if wait should time out |
1018 |
+ |
* @param nanos timeout value if timed |
1019 |
|
*/ |
1020 |
< |
final void awaitJoin(ForkJoinTask<?> joinMe, ForkJoinWorkerThread worker) { |
1020 |
> |
final void awaitJoin(ForkJoinTask<?> joinMe, ForkJoinWorkerThread worker, |
1021 |
> |
boolean timed, long nanos) { |
1022 |
> |
long startTime = timed? System.nanoTime() : 0L; |
1023 |
|
int retries = 2 + (parallelism >> 2); // #helpJoins before blocking |
1024 |
|
while (joinMe.status >= 0) { |
1025 |
|
int wc; |
1026 |
+ |
long nt = 0L; |
1027 |
+ |
if (runState >= TERMINATING) { |
1028 |
+ |
joinMe.cancelIgnoringExceptions(); |
1029 |
+ |
break; |
1030 |
+ |
} |
1031 |
|
worker.helpJoinTask(joinMe); |
1032 |
|
if (joinMe.status < 0) |
1033 |
|
break; |
1034 |
|
else if (retries > 0) |
1035 |
|
--retries; |
1036 |
+ |
else if (timed && |
1037 |
+ |
(nt = nanos - (System.nanoTime() - startTime)) <= 0L) |
1038 |
+ |
break; |
1039 |
|
else if (((wc = workerCounts) & RUNNING_COUNT_MASK) != 0 && |
1040 |
|
UNSAFE.compareAndSwapInt(this, workerCountsOffset, |
1041 |
|
wc, wc - ONE_RUNNING)) { |
1044 |
|
(h = eventWaiters) != 0L && // help release others |
1045 |
|
(int)(h >>> EVENT_COUNT_SHIFT) != eventCount) |
1046 |
|
releaseEventWaiters(); |
1047 |
< |
if (stat >= 0 && |
1048 |
< |
((workerCounts & RUNNING_COUNT_MASK) == 0 || |
1049 |
< |
(stat = |
1050 |
< |
joinMe.internalAwaitDone(JOIN_TIMEOUT_MILLIS)) >= 0)) |
1051 |
< |
helpMaintainParallelism(); // timeout or no running workers |
1047 |
> |
if (stat >= 0) { |
1048 |
> |
if ((workerCounts & RUNNING_COUNT_MASK) != 0) { |
1049 |
> |
long ms; int ns; |
1050 |
> |
if (!timed) { |
1051 |
> |
ms = JOIN_TIMEOUT_MILLIS; |
1052 |
> |
ns = 0; |
1053 |
> |
} |
1054 |
> |
else { // at most JOIN_TIMEOUT_MILLIS per wait |
1055 |
> |
ms = nt / 1000000; |
1056 |
> |
if (ms > JOIN_TIMEOUT_MILLIS) { |
1057 |
> |
ms = JOIN_TIMEOUT_MILLIS; |
1058 |
> |
ns = 0; |
1059 |
> |
} |
1060 |
> |
else |
1061 |
> |
ns = (int) (nt % 1000000); |
1062 |
> |
} |
1063 |
> |
stat = joinMe.internalAwaitDone(ms, ns); |
1064 |
> |
} |
1065 |
> |
if (stat >= 0) // timeout or no running workers |
1066 |
> |
helpMaintainParallelism(); |
1067 |
> |
} |
1068 |
|
do {} while (!UNSAFE.compareAndSwapInt |
1069 |
|
(this, workerCountsOffset, |
1070 |
|
c = workerCounts, c + ONE_RUNNING)); |
1133 |
|
return true; |
1134 |
|
} |
1135 |
|
|
1136 |
+ |
|
1137 |
|
/** |
1138 |
|
* Actions on transition to TERMINATING |
1139 |
|
* |
1151 |
|
c = eventCount, c+1); |
1152 |
|
eventWaiters = 0L; // clobber lists |
1153 |
|
spareWaiters = 0; |
1154 |
< |
ForkJoinWorkerThread[] ws = workers; |
1111 |
< |
int n = ws.length; |
1112 |
< |
for (int i = 0; i < n; ++i) { |
1113 |
< |
ForkJoinWorkerThread w = ws[i]; |
1154 |
> |
for (ForkJoinWorkerThread w : workers) { |
1155 |
|
if (w != null) { |
1156 |
|
w.shutdown(); |
1157 |
|
if (passes > 0 && !w.isTerminated()) { |
1158 |
|
w.cancelTasks(); |
1159 |
|
LockSupport.unpark(w); |
1160 |
< |
if (passes > 1) { |
1160 |
> |
if (passes > 1 && !w.isInterrupted()) { |
1161 |
|
try { |
1162 |
|
w.interrupt(); |
1163 |
|
} catch (SecurityException ignore) { |
1170 |
|
} |
1171 |
|
|
1172 |
|
/** |
1173 |
< |
* Clear out and cancel submissions, ignoring exceptions |
1173 |
> |
* Clears out and cancels submissions, ignoring exceptions. |
1174 |
|
*/ |
1175 |
|
private void cancelSubmissions() { |
1176 |
|
ForkJoinTask<?> task; |
1185 |
|
// misc support for ForkJoinWorkerThread |
1186 |
|
|
1187 |
|
/** |
1188 |
< |
* Returns pool number |
1188 |
> |
* Returns pool number. |
1189 |
|
*/ |
1190 |
|
final int getPoolNumber() { |
1191 |
|
return poolNumber; |
1192 |
|
} |
1193 |
|
|
1194 |
|
/** |
1195 |
< |
* Tries to accumulates steal count from a worker, clearing |
1196 |
< |
* the worker's value. |
1195 |
> |
* Tries to accumulate steal count from a worker, clearing |
1196 |
> |
* the worker's value if successful. |
1197 |
|
* |
1198 |
|
* @return true if worker steal count now zero |
1199 |
|
*/ |
1217 |
|
int pc = parallelism; // use parallelism, not rc |
1218 |
|
int ac = runState; // no mask -- artificially boosts during shutdown |
1219 |
|
// Use exact results for small values, saturate past 4 |
1220 |
< |
return pc <= ac? 0 : pc >>> 1 <= ac? 1 : pc >>> 2 <= ac? 3 : pc >>> 3; |
1220 |
> |
return ((pc <= ac) ? 0 : |
1221 |
> |
(pc >>> 1 <= ac) ? 1 : |
1222 |
> |
(pc >>> 2 <= ac) ? 3 : |
1223 |
> |
pc >>> 3); |
1224 |
|
} |
1225 |
|
|
1226 |
|
// Public and protected methods |
1270 |
|
* use {@link #defaultForkJoinWorkerThreadFactory}. |
1271 |
|
* @param handler the handler for internal worker threads that |
1272 |
|
* terminate due to unrecoverable errors encountered while executing |
1273 |
< |
* tasks. For default value, use <code>null</code>. |
1273 |
> |
* tasks. For default value, use {@code null}. |
1274 |
|
* @param asyncMode if true, |
1275 |
|
* establishes local first-in-first-out scheduling mode for forked |
1276 |
|
* tasks that are never joined. This mode may be more appropriate |
1277 |
|
* than default locally stack-based mode in applications in which |
1278 |
|
* worker threads only process event-style asynchronous tasks. |
1279 |
< |
* For default value, use <code>false</code>. |
1279 |
> |
* For default value, use {@code false}. |
1280 |
|
* @throws IllegalArgumentException if parallelism less than or |
1281 |
|
* equal to zero, or greater than implementation limit |
1282 |
|
* @throws NullPointerException if the factory is null |
1324 |
|
// Execution methods |
1325 |
|
|
1326 |
|
/** |
1327 |
< |
* Common code for execute, invoke and submit |
1327 |
> |
* Submits task and creates, starts, or resumes some workers if necessary |
1328 |
|
*/ |
1329 |
|
private <T> void doSubmit(ForkJoinTask<T> task) { |
1286 |
– |
if (task == null) |
1287 |
– |
throw new NullPointerException(); |
1288 |
– |
if (runState >= SHUTDOWN) |
1289 |
– |
throw new RejectedExecutionException(); |
1330 |
|
submissionQueue.offer(task); |
1331 |
|
int c; // try to increment event count -- CAS failure OK |
1332 |
|
UNSAFE.compareAndSwapInt(this, eventCountOffset, c = eventCount, c+1); |
1333 |
< |
helpMaintainParallelism(); // create, start, or resume some workers |
1333 |
> |
helpMaintainParallelism(); |
1334 |
|
} |
1335 |
|
|
1336 |
|
/** |
1343 |
|
* scheduled for execution |
1344 |
|
*/ |
1345 |
|
public <T> T invoke(ForkJoinTask<T> task) { |
1346 |
< |
doSubmit(task); |
1347 |
< |
return task.join(); |
1346 |
> |
if (task == null) |
1347 |
> |
throw new NullPointerException(); |
1348 |
> |
if (runState >= SHUTDOWN) |
1349 |
> |
throw new RejectedExecutionException(); |
1350 |
> |
Thread t = Thread.currentThread(); |
1351 |
> |
if ((t instanceof ForkJoinWorkerThread) && |
1352 |
> |
((ForkJoinWorkerThread)t).pool == this) |
1353 |
> |
return task.invoke(); // bypass submit if in same pool |
1354 |
> |
else { |
1355 |
> |
doSubmit(task); |
1356 |
> |
return task.join(); |
1357 |
> |
} |
1358 |
> |
} |
1359 |
> |
|
1360 |
> |
/** |
1361 |
> |
* Unless terminating, forks task if within an ongoing FJ |
1362 |
> |
* computation in the current pool, else submits as external task. |
1363 |
> |
*/ |
1364 |
> |
private <T> void forkOrSubmit(ForkJoinTask<T> task) { |
1365 |
> |
if (runState >= SHUTDOWN) |
1366 |
> |
throw new RejectedExecutionException(); |
1367 |
> |
Thread t = Thread.currentThread(); |
1368 |
> |
if ((t instanceof ForkJoinWorkerThread) && |
1369 |
> |
((ForkJoinWorkerThread)t).pool == this) |
1370 |
> |
task.fork(); |
1371 |
> |
else |
1372 |
> |
doSubmit(task); |
1373 |
|
} |
1374 |
|
|
1375 |
|
/** |
1381 |
|
* scheduled for execution |
1382 |
|
*/ |
1383 |
|
public void execute(ForkJoinTask<?> task) { |
1384 |
< |
doSubmit(task); |
1384 |
> |
if (task == null) |
1385 |
> |
throw new NullPointerException(); |
1386 |
> |
forkOrSubmit(task); |
1387 |
|
} |
1388 |
|
|
1389 |
|
// AbstractExecutorService methods |
1394 |
|
* scheduled for execution |
1395 |
|
*/ |
1396 |
|
public void execute(Runnable task) { |
1397 |
+ |
if (task == null) |
1398 |
+ |
throw new NullPointerException(); |
1399 |
|
ForkJoinTask<?> job; |
1400 |
|
if (task instanceof ForkJoinTask<?>) // avoid re-wrap |
1401 |
|
job = (ForkJoinTask<?>) task; |
1402 |
|
else |
1403 |
|
job = ForkJoinTask.adapt(task, null); |
1404 |
< |
doSubmit(job); |
1404 |
> |
forkOrSubmit(job); |
1405 |
|
} |
1406 |
|
|
1407 |
|
/** |
1414 |
|
* scheduled for execution |
1415 |
|
*/ |
1416 |
|
public <T> ForkJoinTask<T> submit(ForkJoinTask<T> task) { |
1417 |
< |
doSubmit(task); |
1417 |
> |
if (task == null) |
1418 |
> |
throw new NullPointerException(); |
1419 |
> |
forkOrSubmit(task); |
1420 |
|
return task; |
1421 |
|
} |
1422 |
|
|
1426 |
|
* scheduled for execution |
1427 |
|
*/ |
1428 |
|
public <T> ForkJoinTask<T> submit(Callable<T> task) { |
1429 |
+ |
if (task == null) |
1430 |
+ |
throw new NullPointerException(); |
1431 |
|
ForkJoinTask<T> job = ForkJoinTask.adapt(task); |
1432 |
< |
doSubmit(job); |
1432 |
> |
forkOrSubmit(job); |
1433 |
|
return job; |
1434 |
|
} |
1435 |
|
|
1439 |
|
* scheduled for execution |
1440 |
|
*/ |
1441 |
|
public <T> ForkJoinTask<T> submit(Runnable task, T result) { |
1442 |
+ |
if (task == null) |
1443 |
+ |
throw new NullPointerException(); |
1444 |
|
ForkJoinTask<T> job = ForkJoinTask.adapt(task, result); |
1445 |
< |
doSubmit(job); |
1445 |
> |
forkOrSubmit(job); |
1446 |
|
return job; |
1447 |
|
} |
1448 |
|
|
1452 |
|
* scheduled for execution |
1453 |
|
*/ |
1454 |
|
public ForkJoinTask<?> submit(Runnable task) { |
1455 |
+ |
if (task == null) |
1456 |
+ |
throw new NullPointerException(); |
1457 |
|
ForkJoinTask<?> job; |
1458 |
|
if (task instanceof ForkJoinTask<?>) // avoid re-wrap |
1459 |
|
job = (ForkJoinTask<?>) task; |
1460 |
|
else |
1461 |
|
job = ForkJoinTask.adapt(task, null); |
1462 |
< |
doSubmit(job); |
1462 |
> |
forkOrSubmit(job); |
1463 |
|
return job; |
1464 |
|
} |
1465 |
|
|
1519 |
|
|
1520 |
|
/** |
1521 |
|
* Returns the number of worker threads that have started but not |
1522 |
< |
* yet terminated. This result returned by this method may differ |
1522 |
> |
* yet terminated. The result returned by this method may differ |
1523 |
|
* from {@link #getParallelism} when threads are created to |
1524 |
|
* maintain parallelism when others are cooperatively blocked. |
1525 |
|
* |
1604 |
|
*/ |
1605 |
|
public long getQueuedTaskCount() { |
1606 |
|
long count = 0; |
1607 |
< |
ForkJoinWorkerThread[] ws = workers; |
1531 |
< |
int n = ws.length; |
1532 |
< |
for (int i = 0; i < n; ++i) { |
1533 |
< |
ForkJoinWorkerThread w = ws[i]; |
1607 |
> |
for (ForkJoinWorkerThread w : workers) |
1608 |
|
if (w != null) |
1609 |
|
count += w.getQueueSize(); |
1536 |
– |
} |
1610 |
|
return count; |
1611 |
|
} |
1612 |
|
|
1661 |
|
*/ |
1662 |
|
protected int drainTasksTo(Collection<? super ForkJoinTask<?>> c) { |
1663 |
|
int count = submissionQueue.drainTo(c); |
1664 |
< |
ForkJoinWorkerThread[] ws = workers; |
1592 |
< |
int n = ws.length; |
1593 |
< |
for (int i = 0; i < n; ++i) { |
1594 |
< |
ForkJoinWorkerThread w = ws[i]; |
1664 |
> |
for (ForkJoinWorkerThread w : workers) |
1665 |
|
if (w != null) |
1666 |
|
count += w.drainTasksTo(c); |
1597 |
– |
} |
1667 |
|
return count; |
1668 |
|
} |
1669 |
|
|
1767 |
|
} |
1768 |
|
|
1769 |
|
/** |
1770 |
+ |
* Returns true if terminating or terminated. Used by ForkJoinWorkerThread. |
1771 |
+ |
*/ |
1772 |
+ |
final boolean isAtLeastTerminating() { |
1773 |
+ |
return runState >= TERMINATING; |
1774 |
+ |
} |
1775 |
+ |
|
1776 |
+ |
/** |
1777 |
|
* Returns {@code true} if this pool has been shut down. |
1778 |
|
* |
1779 |
|
* @return {@code true} if this pool has been shut down |
1927 |
|
private static final long eventCountOffset = |
1928 |
|
objectFieldOffset("eventCount", ForkJoinPool.class); |
1929 |
|
private static final long eventWaitersOffset = |
1930 |
< |
objectFieldOffset("eventWaiters",ForkJoinPool.class); |
1930 |
> |
objectFieldOffset("eventWaiters", ForkJoinPool.class); |
1931 |
|
private static final long stealCountOffset = |
1932 |
< |
objectFieldOffset("stealCount",ForkJoinPool.class); |
1932 |
> |
objectFieldOffset("stealCount", ForkJoinPool.class); |
1933 |
|
private static final long spareWaitersOffset = |
1934 |
< |
objectFieldOffset("spareWaiters",ForkJoinPool.class); |
1934 |
> |
objectFieldOffset("spareWaiters", ForkJoinPool.class); |
1935 |
|
|
1936 |
|
private static long objectFieldOffset(String field, Class<?> klazz) { |
1937 |
|
try { |