| 300 |
|
* about the same time as another is needlessly being created. We |
| 301 |
|
* counteract this and related slop in part by requiring resumed |
| 302 |
|
* spares to immediately recheck (in preStep) to see whether they |
| 303 |
< |
* they should re-suspend. |
| 303 |
> |
* should re-suspend. |
| 304 |
|
* |
| 305 |
|
* 6. Killing off unneeded workers. A timeout mechanism is used to |
| 306 |
|
* shed unused workers: The oldest (first) event queue waiter uses |
| 429 |
|
|
| 430 |
|
/** |
| 431 |
|
* The wakeup interval (in nanoseconds) for the oldest worker |
| 432 |
< |
* worker waiting for an event invokes tryShutdownUnusedWorker to shrink |
| 432 |
> |
* waiting for an event invokes tryShutdownUnusedWorker to shrink |
| 433 |
|
* the number of workers. The exact value does not matter too |
| 434 |
|
* much, but should be long enough to slowly release resources |
| 435 |
|
* during long periods without use without disrupting normal use. |
| 806 |
|
// Maintaining parallelism |
| 807 |
|
|
| 808 |
|
/** |
| 809 |
< |
* Pushes worker onto the spare stack |
| 809 |
> |
* Pushes worker onto the spare stack. |
| 810 |
|
*/ |
| 811 |
|
final void pushSpare(ForkJoinWorkerThread w) { |
| 812 |
|
int ns = (++w.spareCount << SPARE_COUNT_SHIFT) | (w.poolIndex + 1); |
| 1125 |
|
} |
| 1126 |
|
|
| 1127 |
|
/** |
| 1128 |
< |
* Clear out and cancel submissions, ignoring exceptions |
| 1128 |
> |
* Clears out and cancels submissions, ignoring exceptions. |
| 1129 |
|
*/ |
| 1130 |
|
private void cancelSubmissions() { |
| 1131 |
|
ForkJoinTask<?> task; |
| 1140 |
|
// misc support for ForkJoinWorkerThread |
| 1141 |
|
|
| 1142 |
|
/** |
| 1143 |
< |
* Returns pool number |
| 1143 |
> |
* Returns pool number. |
| 1144 |
|
*/ |
| 1145 |
|
final int getPoolNumber() { |
| 1146 |
|
return poolNumber; |
| 1147 |
|
} |
| 1148 |
|
|
| 1149 |
|
/** |
| 1150 |
< |
* Tries to accumulates steal count from a worker, clearing |
| 1151 |
< |
* the worker's value. |
| 1150 |
> |
* Tries to accumulate steal count from a worker, clearing |
| 1151 |
> |
* the worker's value if successful. |
| 1152 |
|
* |
| 1153 |
|
* @return true if worker steal count now zero |
| 1154 |
|
*/ |
| 1172 |
|
int pc = parallelism; // use parallelism, not rc |
| 1173 |
|
int ac = runState; // no mask -- artificially boosts during shutdown |
| 1174 |
|
// Use exact results for small values, saturate past 4 |
| 1175 |
< |
return pc <= ac? 0 : pc >>> 1 <= ac? 1 : pc >>> 2 <= ac? 3 : pc >>> 3; |
| 1175 |
> |
return ((pc <= ac) ? 0 : |
| 1176 |
> |
(pc >>> 1 <= ac) ? 1 : |
| 1177 |
> |
(pc >>> 2 <= ac) ? 3 : |
| 1178 |
> |
pc >>> 3); |
| 1179 |
|
} |
| 1180 |
|
|
| 1181 |
|
// Public and protected methods |
| 1225 |
|
* use {@link #defaultForkJoinWorkerThreadFactory}. |
| 1226 |
|
* @param handler the handler for internal worker threads that |
| 1227 |
|
* terminate due to unrecoverable errors encountered while executing |
| 1228 |
< |
* tasks. For default value, use <code>null</code>. |
| 1228 |
> |
* tasks. For default value, use {@code null}. |
| 1229 |
|
* @param asyncMode if true, |
| 1230 |
|
* establishes local first-in-first-out scheduling mode for forked |
| 1231 |
|
* tasks that are never joined. This mode may be more appropriate |
| 1232 |
|
* than default locally stack-based mode in applications in which |
| 1233 |
|
* worker threads only process event-style asynchronous tasks. |
| 1234 |
< |
* For default value, use <code>false</code>. |
| 1234 |
> |
* For default value, use {@code false}. |
| 1235 |
|
* @throws IllegalArgumentException if parallelism less than or |
| 1236 |
|
* equal to zero, or greater than implementation limit |
| 1237 |
|
* @throws NullPointerException if the factory is null |
| 1441 |
|
|
| 1442 |
|
/** |
| 1443 |
|
* Returns the number of worker threads that have started but not |
| 1444 |
< |
* yet terminated. This result returned by this method may differ |
| 1444 |
> |
* yet terminated. The result returned by this method may differ |
| 1445 |
|
* from {@link #getParallelism} when threads are created to |
| 1446 |
|
* maintain parallelism when others are cooperatively blocked. |
| 1447 |
|
* |
| 1842 |
|
private static final long eventCountOffset = |
| 1843 |
|
objectFieldOffset("eventCount", ForkJoinPool.class); |
| 1844 |
|
private static final long eventWaitersOffset = |
| 1845 |
< |
objectFieldOffset("eventWaiters",ForkJoinPool.class); |
| 1845 |
> |
objectFieldOffset("eventWaiters", ForkJoinPool.class); |
| 1846 |
|
private static final long stealCountOffset = |
| 1847 |
< |
objectFieldOffset("stealCount",ForkJoinPool.class); |
| 1847 |
> |
objectFieldOffset("stealCount", ForkJoinPool.class); |
| 1848 |
|
private static final long spareWaitersOffset = |
| 1849 |
< |
objectFieldOffset("spareWaiters",ForkJoinPool.class); |
| 1849 |
> |
objectFieldOffset("spareWaiters", ForkJoinPool.class); |
| 1850 |
|
|
| 1851 |
|
private static long objectFieldOffset(String field, Class<?> klazz) { |
| 1852 |
|
try { |
