| 987 |
|
if (t != null) { |
| 988 |
|
(currentSteal = t).doExec(); |
| 989 |
|
currentSteal = null; |
| 990 |
+ |
++nsteals; |
| 991 |
|
if (base - top < 0) { // process remaining local tasks |
| 992 |
|
if (mode == 0) |
| 993 |
|
popAndExecAll(); |
| 994 |
|
else |
| 995 |
|
pollAndExecAll(); |
| 996 |
|
} |
| 996 |
– |
++nsteals; |
| 997 |
– |
hint = -1; |
| 997 |
|
} |
| 998 |
|
} |
| 999 |
|
|
| 1020 |
|
s != Thread.State.TIMED_WAITING); |
| 1021 |
|
} |
| 1022 |
|
|
| 1024 |
– |
/** |
| 1025 |
– |
* If this owned and is not already interrupted, try to |
| 1026 |
– |
* interrupt and/or unpark, ignoring exceptions. |
| 1027 |
– |
*/ |
| 1028 |
– |
final void interruptOwner() { |
| 1029 |
– |
Thread wt, p; |
| 1030 |
– |
if ((wt = owner) != null && !wt.isInterrupted()) { |
| 1031 |
– |
try { |
| 1032 |
– |
wt.interrupt(); |
| 1033 |
– |
} catch (SecurityException ignore) { |
| 1034 |
– |
} |
| 1035 |
– |
} |
| 1036 |
– |
if ((p = parker) != null) |
| 1037 |
– |
U.unpark(p); |
| 1038 |
– |
} |
| 1039 |
– |
|
| 1023 |
|
// Unsafe mechanics |
| 1024 |
|
private static final sun.misc.Unsafe U; |
| 1025 |
|
private static final long QLOCK; |
| 1114 |
|
/** |
| 1115 |
|
* Tolerance for idle timeouts, to cope with timer undershoots |
| 1116 |
|
*/ |
| 1117 |
< |
private static final long TIMEOUT_SLOP = 2000000L; // 20ms |
| 1117 |
> |
private static final long TIMEOUT_SLOP = 2000000L; |
| 1118 |
|
|
| 1119 |
|
/** |
| 1120 |
|
* The maximum stolen->joining link depth allowed in method |
| 1251 |
|
* fails. This acts as a spinLock for normal cases, but falls back |
| 1252 |
|
* to builtin monitor to block when (rarely) needed. This would be |
| 1253 |
|
* a terrible idea for a highly contended lock, but works fine as |
| 1254 |
< |
* a more conservative alternative to a pure spinlock. See |
| 1272 |
< |
* internal ConcurrentHashMap documentation for further |
| 1273 |
< |
* explanation of nearly the same construction. |
| 1254 |
> |
* a more conservative alternative to a pure spinlock. |
| 1255 |
|
*/ |
| 1256 |
|
private int acquirePlock() { |
| 1257 |
|
int spins = PL_SPINS, r = 0, ps, nps; |
| 1447 |
|
} |
| 1448 |
|
} |
| 1449 |
|
|
| 1450 |
< |
long c; // adjust ctl counts |
| 1450 |
> |
long c; // adjust ctl counts |
| 1451 |
|
do {} while (!U.compareAndSwapLong |
| 1452 |
|
(this, CTL, c = ctl, (((c - AC_UNIT) & AC_MASK) | |
| 1453 |
|
((c - TC_UNIT) & TC_MASK) | |
| 1454 |
|
(c & ~(AC_MASK|TC_MASK))))); |
| 1455 |
|
|
| 1456 |
|
if (!tryTerminate(false, false) && w != null && w.array != null) { |
| 1457 |
< |
w.cancelAll(); // cancel remaining tasks |
| 1458 |
< |
int e, u, i, n; WorkQueue[] ws; WorkQueue v; Thread p; |
| 1459 |
< |
while ((u = (int)((c = ctl) >>> 32)) < 0) { |
| 1460 |
< |
if ((e = (int)c) > 0) { // activate or create replacement |
| 1461 |
< |
if ((ws = workQueues) != null && |
| 1462 |
< |
ws.length > (i = e & SMASK) && |
| 1463 |
< |
(v = ws[i]) != null && v.eventCount == (e | INT_SIGN)) { |
| 1483 |
< |
long nc = (((long)(v.nextWait & E_MASK)) | |
| 1484 |
< |
((long)(u + UAC_UNIT) << 32)); |
| 1485 |
< |
if (U.compareAndSwapLong(this, CTL, c, nc)) { |
| 1486 |
< |
v.eventCount = (e + E_SEQ) & E_MASK; |
| 1487 |
< |
if ((p = v.parker) != null) |
| 1488 |
< |
U.unpark(p); |
| 1489 |
< |
break; |
| 1490 |
< |
} |
| 1491 |
< |
} |
| 1492 |
< |
else |
| 1457 |
> |
w.cancelAll(); // cancel remaining tasks |
| 1458 |
> |
WorkQueue[] ws; WorkQueue v; Thread p; int u, i, e; |
| 1459 |
> |
while ((u = (int)((c = ctl) >>> 32)) < 0 && (e = (int)c) >= 0) { |
| 1460 |
> |
if (e > 0) { // activate or create replacement |
| 1461 |
> |
if ((ws = workQueues) == null || |
| 1462 |
> |
(i = e & SMASK) >= ws.length || |
| 1463 |
> |
(v = ws[i]) == null) |
| 1464 |
|
break; |
| 1465 |
+ |
long nc = (((long)(v.nextWait & E_MASK)) | |
| 1466 |
+ |
((long)(u + UAC_UNIT) << 32)); |
| 1467 |
+ |
if (v.eventCount != (e | INT_SIGN)) |
| 1468 |
+ |
break; |
| 1469 |
+ |
if (U.compareAndSwapLong(this, CTL, c, nc)) { |
| 1470 |
+ |
v.eventCount = (e + E_SEQ) & E_MASK; |
| 1471 |
+ |
if ((p = v.parker) != null) |
| 1472 |
+ |
U.unpark(p); |
| 1473 |
+ |
break; |
| 1474 |
+ |
} |
| 1475 |
|
} |
| 1476 |
|
else { |
| 1477 |
|
if ((short)u < 0) |
| 1667 |
|
* |
| 1668 |
|
* * If not already enqueued, try to inactivate and enqueue the |
| 1669 |
|
* worker on wait queue. Or, if inactivating has caused the pool |
| 1670 |
< |
* to be quiescent, relay to idleAwaitWork to check for |
| 1671 |
< |
* termination and possibly shrink pool. |
| 1670 |
> |
* to be quiescent, relay to idleAwaitWork to possibly shrink |
| 1671 |
> |
* pool. |
| 1672 |
|
* |
| 1673 |
|
* * If already enqueued and none of the above apply, possibly |
| 1674 |
< |
* (with 1/2 probability) park awaiting signal, else lingering to |
| 1675 |
< |
* help scan and signal. |
| 1674 |
> |
* park awaiting signal, else lingering to help scan and signal. |
| 1675 |
> |
* |
| 1676 |
> |
* * If a non-empty queue discovered or left as a hint, |
| 1677 |
> |
* help wake up other workers before return |
| 1678 |
|
* |
| 1679 |
|
* @param w the worker (via its WorkQueue) |
| 1680 |
|
* @return a task or null if none found |
| 1685 |
|
if (w != null && (ws = workQueues) != null && (m = ws.length - 1) >= 0) { |
| 1686 |
|
int ec = w.eventCount; // ec is negative if inactive |
| 1687 |
|
int r = w.seed; r ^= r << 13; r ^= r >>> 17; w.seed = r ^= r << 5; |
| 1688 |
+ |
w.hint = -1; // update seed and clear hint |
| 1689 |
|
int j = ((m + m + 1) | MIN_SCAN) & MAX_SCAN; |
| 1690 |
|
do { |
| 1691 |
|
WorkQueue q; ForkJoinTask<?>[] a; int b; |
| 1707 |
|
} |
| 1708 |
|
} while (--j >= 0); |
| 1709 |
|
|
| 1710 |
< |
long c, sc; int e, ns, h; |
| 1711 |
< |
if ((h = w.hint) < 0) { |
| 1712 |
< |
if ((ns = w.nsteals) != 0) { |
| 1713 |
< |
if (U.compareAndSwapLong(this, STEALCOUNT, |
| 1714 |
< |
sc = stealCount, sc + ns)) |
| 1715 |
< |
w.nsteals = 0; // collect steals |
| 1716 |
< |
} |
| 1717 |
< |
else if (plock != ps) // consistency check |
| 1718 |
< |
; // skip |
| 1719 |
< |
else if ((e = (int)(c = ctl)) < 0) |
| 1720 |
< |
w.qlock = -1; // pool is terminating |
| 1721 |
< |
else if (ec >= 0) { // try to enqueue/inactivate |
| 1722 |
< |
long nc = ((long)ec | ((c - AC_UNIT) & (AC_MASK|TC_MASK))); |
| 1723 |
< |
w.nextWait = e; // link and mark inactive |
| 1724 |
< |
w.eventCount = ec | INT_SIGN; |
| 1725 |
< |
if (ctl != c || !U.compareAndSwapLong(this, CTL, c, nc)) |
| 1726 |
< |
w.eventCount = ec; // unmark on CAS failure |
| 1727 |
< |
else if ((int)(c >> AC_SHIFT) == 1 - (config & SMASK)) |
| 1728 |
< |
idleAwaitWork(w, nc, c); |
| 1729 |
< |
} |
| 1730 |
< |
else if (w.eventCount < 0) { // block |
| 1731 |
< |
Thread wt = Thread.currentThread(); |
| 1732 |
< |
Thread.interrupted(); // clear status |
| 1733 |
< |
U.putObject(wt, PARKBLOCKER, this); |
| 1734 |
< |
w.parker = wt; // emulate LockSupport.park |
| 1735 |
< |
if (w.eventCount < 0) // recheck |
| 1736 |
< |
U.park(false, 0L); |
| 1737 |
< |
w.parker = null; |
| 1738 |
< |
U.putObject(wt, PARKBLOCKER, null); |
| 1710 |
> |
int h, e, ns; long c, sc; WorkQueue q; |
| 1711 |
> |
if ((ns = w.nsteals) != 0) { |
| 1712 |
> |
if (U.compareAndSwapLong(this, STEALCOUNT, |
| 1713 |
> |
sc = stealCount, sc + ns)) |
| 1714 |
> |
w.nsteals = 0; // collect steals and rescan |
| 1715 |
> |
} |
| 1716 |
> |
else if (plock != ps) // consistency check |
| 1717 |
> |
; // skip |
| 1718 |
> |
else if ((e = (int)(c = ctl)) < 0) |
| 1719 |
> |
w.qlock = -1; // pool is terminating |
| 1720 |
> |
else { |
| 1721 |
> |
if ((h = w.hint) < 0) { |
| 1722 |
> |
if (ec >= 0) { // try to enqueue/inactivate |
| 1723 |
> |
long nc = (((long)ec | |
| 1724 |
> |
((c - AC_UNIT) & (AC_MASK|TC_MASK)))); |
| 1725 |
> |
w.nextWait = e; // link and mark inactive |
| 1726 |
> |
w.eventCount = ec | INT_SIGN; |
| 1727 |
> |
if (ctl != c || !U.compareAndSwapLong(this, CTL, c, nc)) |
| 1728 |
> |
w.eventCount = ec; // unmark on CAS failure |
| 1729 |
> |
else if ((int)(c >> AC_SHIFT) == 1 - (config & SMASK)) |
| 1730 |
> |
idleAwaitWork(w, nc, c); |
| 1731 |
> |
} |
| 1732 |
> |
else if (w.eventCount < 0 && !tryTerminate(false, false) && |
| 1733 |
> |
ctl == c) { // block |
| 1734 |
> |
Thread wt = Thread.currentThread(); |
| 1735 |
> |
Thread.interrupted(); // clear status |
| 1736 |
> |
U.putObject(wt, PARKBLOCKER, this); |
| 1737 |
> |
w.parker = wt; // emulate LockSupport.park |
| 1738 |
> |
if (w.eventCount < 0) // recheck |
| 1739 |
> |
U.park(false, 0L); |
| 1740 |
> |
w.parker = null; |
| 1741 |
> |
U.putObject(wt, PARKBLOCKER, null); |
| 1742 |
> |
} |
| 1743 |
> |
} |
| 1744 |
> |
if ((h >= 0 || (h = w.hint) >= 0) && |
| 1745 |
> |
(ws = workQueues) != null && h < ws.length && |
| 1746 |
> |
(q = ws[h]) != null) { // signal others before retry |
| 1747 |
> |
WorkQueue v; Thread p; int u, i, s; |
| 1748 |
> |
for (int n = (config & SMASK) >>> 1;;) { |
| 1749 |
> |
int idleCount = (w.eventCount < 0) ? 0 : -1; |
| 1750 |
> |
if (((s = idleCount - q.base + q.top) <= n && |
| 1751 |
> |
(n = s) <= 0) || |
| 1752 |
> |
(u = (int)((c = ctl) >>> 32)) >= 0 || |
| 1753 |
> |
(e = (int)c) <= 0 || m < (i = e & SMASK) || |
| 1754 |
> |
(v = ws[i]) == null) |
| 1755 |
> |
break; |
| 1756 |
> |
long nc = (((long)(v.nextWait & E_MASK)) | |
| 1757 |
> |
((long)(u + UAC_UNIT) << 32)); |
| 1758 |
> |
if (v.eventCount != (e | INT_SIGN) || |
| 1759 |
> |
!U.compareAndSwapLong(this, CTL, c, nc)) |
| 1760 |
> |
break; |
| 1761 |
> |
v.hint = h; |
| 1762 |
> |
v.eventCount = (e + E_SEQ) & E_MASK; |
| 1763 |
> |
if ((p = v.parker) != null) |
| 1764 |
> |
U.unpark(p); |
| 1765 |
> |
if (--n <= 0) |
| 1766 |
> |
break; |
| 1767 |
> |
} |
| 1768 |
|
} |
| 1769 |
|
} |
| 1757 |
– |
if (h >= 0 || w.hint >= 0) // signal others before retry |
| 1758 |
– |
helpSignalHint(w); |
| 1770 |
|
} |
| 1771 |
|
return null; |
| 1772 |
|
} |
| 1837 |
|
break outer; |
| 1838 |
|
long nc = (((long)(w.nextWait & E_MASK)) | |
| 1839 |
|
((long)(u + UAC_UNIT) << 32)); |
| 1840 |
< |
if (w.eventCount == (e | INT_SIGN) && |
| 1841 |
< |
U.compareAndSwapLong(this, CTL, c, nc)) { |
| 1840 |
> |
if (w.eventCount != (e | INT_SIGN)) |
| 1841 |
> |
break outer; |
| 1842 |
> |
if (U.compareAndSwapLong(this, CTL, c, nc)) { |
| 1843 |
|
w.eventCount = (e + E_SEQ) & E_MASK; |
| 1844 |
|
if ((p = w.parker) != null) |
| 1845 |
|
U.unpark(p); |
| 1852 |
|
} |
| 1853 |
|
|
| 1854 |
|
/** |
| 1843 |
– |
* Signals other workers if tasks are present in hinted queue. |
| 1844 |
– |
* |
| 1845 |
– |
* @param caller the worker with the hint |
| 1846 |
– |
*/ |
| 1847 |
– |
private void helpSignalHint(WorkQueue caller) { |
| 1848 |
– |
WorkQueue[] ws; WorkQueue q, w; Thread p; long c; int h, m, u, e, i, s; |
| 1849 |
– |
if (caller != null && (h = caller.hint) >= 0 && |
| 1850 |
– |
(u = (int)(ctl >>> 32)) < 0 && (u >> UAC_SHIFT) < 0 && |
| 1851 |
– |
(ws = workQueues) != null && (m = ws.length - 1) >= 0 && |
| 1852 |
– |
(q = ws[h & m]) != null) { |
| 1853 |
– |
caller.hint = -1; |
| 1854 |
– |
for (int n = 2;;) { // limit to at most 2 signals |
| 1855 |
– |
int idleCount = (caller.eventCount < 0) ? 0 : -1; |
| 1856 |
– |
if (((s = idleCount - q.base + q.top) <= n && (n = s) <= 0) || |
| 1857 |
– |
(u = (int)((c = ctl) >>> 32)) >= 0 || |
| 1858 |
– |
(e = (int)c) <= 0 || m < (i = e & SMASK) || |
| 1859 |
– |
(w = ws[i]) == null) |
| 1860 |
– |
break; |
| 1861 |
– |
long nc = (((long)(w.nextWait & E_MASK)) | |
| 1862 |
– |
((long)(u + UAC_UNIT) << 32)); |
| 1863 |
– |
if (w.eventCount == (e | INT_SIGN) && |
| 1864 |
– |
U.compareAndSwapLong(this, CTL, c, nc)) { |
| 1865 |
– |
w.hint = h; |
| 1866 |
– |
w.eventCount = (e + E_SEQ) & E_MASK; |
| 1867 |
– |
if ((p = w.parker) != null) |
| 1868 |
– |
U.unpark(p); |
| 1869 |
– |
if (--n <= 0) |
| 1870 |
– |
break; |
| 1871 |
– |
} |
| 1872 |
– |
} |
| 1873 |
– |
} |
| 1874 |
– |
} |
| 1875 |
– |
|
| 1876 |
– |
/** |
| 1855 |
|
* Tries to locate and execute tasks for a stealer of the given |
| 1856 |
|
* task, or in turn one of its stealers, Traces currentSteal -> |
| 1857 |
|
* currentJoin links looking for a thread working on a descendant |
| 2103 |
|
*/ |
| 2104 |
|
private WorkQueue findNonEmptyStealQueue(int r) { |
| 2105 |
|
for (WorkQueue[] ws;;) { |
| 2106 |
< |
int ps = plock, m, n; |
| 2106 |
> |
int ps = plock, m; |
| 2107 |
|
if ((ws = workQueues) == null || (m = ws.length - 1) < 1) |
| 2108 |
|
return null; |
| 2109 |
|
for (int j = (m + 1) << 2; ;) { |
| 2110 |
|
WorkQueue q = ws[(((r + j) << 1) | 1) & m]; |
| 2111 |
< |
if (q != null && (n = q.base - q.top) < 0) { |
| 2134 |
< |
if (n < -1) |
| 2135 |
< |
signalWork(q); |
| 2111 |
> |
if (q != null && q.base - q.top < 0) |
| 2112 |
|
return q; |
| 2137 |
– |
} |
| 2113 |
|
else if (--j < 0) { |
| 2114 |
|
if (plock == ps) |
| 2115 |
|
return null; |
| 2140 |
|
do {} while (!U.compareAndSwapLong |
| 2141 |
|
(this, CTL, c = ctl, c + AC_UNIT)); |
| 2142 |
|
} |
| 2143 |
< |
if ((b = q.base) - q.top < 0 && (t = q.pollAt(b)) != null) |
| 2143 |
> |
if ((b = q.base) - q.top < 0 && (t = q.pollAt(b)) != null) { |
| 2144 |
> |
if (q.base - q.top < 0) |
| 2145 |
> |
signalWork(q); |
| 2146 |
|
w.runSubtask(t); |
| 2147 |
+ |
} |
| 2148 |
|
} |
| 2149 |
|
else { |
| 2150 |
|
long c; |
| 2176 |
|
return t; |
| 2177 |
|
if ((q = findNonEmptyStealQueue(w.nextSeed())) == null) |
| 2178 |
|
return null; |
| 2179 |
< |
if ((b = q.base) - q.top < 0 && (t = q.pollAt(b)) != null) |
| 2179 |
> |
if ((b = q.base) - q.top < 0 && (t = q.pollAt(b)) != null) { |
| 2180 |
> |
if (q.base - q.top < 0) |
| 2181 |
> |
signalWork(q); |
| 2182 |
|
return t; |
| 2183 |
+ |
} |
| 2184 |
|
} |
| 2185 |
|
} |
| 2186 |
|
|
| 2280 |
|
if (((ps = plock) & PL_LOCK) != 0 || |
| 2281 |
|
!U.compareAndSwapInt(this, PLOCK, ps, ps += PL_LOCK)) |
| 2282 |
|
ps = acquirePlock(); |
| 2283 |
< |
int nps = SHUTDOWN; |
| 2284 |
< |
if (!U.compareAndSwapInt(this, PLOCK, ps, nps)) |
| 2304 |
< |
releasePlock(nps); |
| 2283 |
> |
if (!U.compareAndSwapInt(this, PLOCK, ps, SHUTDOWN)) |
| 2284 |
> |
releasePlock(SHUTDOWN); |
| 2285 |
|
} |
| 2286 |
|
if (!now) { // check if idle & no tasks |
| 2287 |
|
if ((int)(c >> AC_SHIFT) != -(config & SMASK) || |
| 2300 |
|
for (int pass = 0; pass < 3; ++pass) { |
| 2301 |
|
WorkQueue[] ws = workQueues; |
| 2302 |
|
if (ws != null) { |
| 2303 |
< |
WorkQueue w; |
| 2303 |
> |
WorkQueue w; Thread wt; |
| 2304 |
|
int n = ws.length; |
| 2305 |
|
for (int i = 0; i < n; ++i) { |
| 2306 |
|
if ((w = ws[i]) != null) { |
| 2307 |
|
w.qlock = -1; |
| 2308 |
|
if (pass > 0) { |
| 2309 |
|
w.cancelAll(); |
| 2310 |
< |
if (pass > 1) |
| 2311 |
< |
w.interruptOwner(); |
| 2310 |
> |
if (pass > 1 && (wt = w.owner) != null) { |
| 2311 |
> |
if (!wt.isInterrupted()) { |
| 2312 |
> |
try { |
| 2313 |
> |
wt.interrupt(); |
| 2314 |
> |
} catch (SecurityException ignore) { |
| 2315 |
> |
} |
| 2316 |
> |
} |
| 2317 |
> |
U.unpark(wt); |
| 2318 |
> |
} |
| 2319 |
|
} |
| 2320 |
|
} |
| 2321 |
|
} |
| 2478 |
|
if ((p = commonPool) != null && |
| 2479 |
|
(q = p.findNonEmptyStealQueue(1)) != null && |
| 2480 |
|
(b = q.base) - q.top < 0 && |
| 2481 |
< |
(t = q.pollAt(b)) != null) |
| 2481 |
> |
(t = q.pollAt(b)) != null) { |
| 2482 |
> |
if (q.base - q.top < 0) |
| 2483 |
> |
p.signalWork(q); |
| 2484 |
|
t.doExec(); |
| 2485 |
+ |
} |
| 2486 |
|
} |
| 2487 |
|
|
| 2488 |
|
// Exported methods |
| 2583 |
|
} |
| 2584 |
|
|
| 2585 |
|
/** |
| 2586 |
< |
* Returns the common pool instance. |
| 2586 |
> |
* Returns the common pool instance. This pool is statically |
| 2587 |
> |
* constructed; its run state is unaffected by attempts to |
| 2588 |
> |
* {@link #shutdown} or {@link #shutdownNow}. |
| 2589 |
|
* |
| 2590 |
|
* @return the common pool instance |
| 2591 |
|
*/ |
