| 311 |
|
} |
| 312 |
|
|
| 313 |
|
/** |
| 314 |
< |
* Returns true if argument represents zero active count and |
| 315 |
< |
* nonzero runstate, which is the triggering condition for |
| 314 |
> |
* Returns {@code true} if argument represents zero active count |
| 315 |
> |
* and nonzero runstate, which is the triggering condition for |
| 316 |
|
* terminating on shutdown. |
| 317 |
|
*/ |
| 318 |
|
private static boolean canTerminateOnShutdown(int c) { |
| 720 |
|
* Returns the handler for internal worker threads that terminate |
| 721 |
|
* due to unrecoverable errors encountered while executing tasks. |
| 722 |
|
* |
| 723 |
< |
* @return the handler, or null if none |
| 723 |
> |
* @return the handler, or {@code null} if none |
| 724 |
|
*/ |
| 725 |
|
public Thread.UncaughtExceptionHandler getUncaughtExceptionHandler() { |
| 726 |
|
Thread.UncaughtExceptionHandler h; |
| 741 |
|
* as handler. |
| 742 |
|
* |
| 743 |
|
* @param h the new handler |
| 744 |
< |
* @return the old handler, or null if none |
| 744 |
> |
* @return the old handler, or {@code null} if none |
| 745 |
|
* @throws SecurityException if a security manager exists and |
| 746 |
|
* the caller is not permitted to modify threads |
| 747 |
|
* because it does not hold {@link |
| 851 |
|
|
| 852 |
|
|
| 853 |
|
/** |
| 854 |
< |
* Returns true if this pool dynamically maintains its target |
| 855 |
< |
* parallelism level. If false, new threads are added only to |
| 856 |
< |
* avoid possible starvation. |
| 857 |
< |
* This setting is by default true. |
| 854 |
> |
* Returns {@code true} if this pool dynamically maintains its |
| 855 |
> |
* target parallelism level. If false, new threads are added only |
| 856 |
> |
* to avoid possible starvation. This setting is by default true. |
| 857 |
|
* |
| 858 |
< |
* @return true if maintains parallelism |
| 858 |
> |
* @return {@code true} if maintains parallelism |
| 859 |
|
*/ |
| 860 |
|
public boolean getMaintainsParallelism() { |
| 861 |
|
return maintainsParallelism; |
| 866 |
|
* parallelism level. If false, new threads are added only to |
| 867 |
|
* avoid possible starvation. |
| 868 |
|
* |
| 869 |
< |
* @param enable true to maintains parallelism |
| 869 |
> |
* @param enable {@code true} to maintain parallelism |
| 870 |
|
*/ |
| 871 |
|
public void setMaintainsParallelism(boolean enable) { |
| 872 |
|
maintainsParallelism = enable; |
| 899 |
|
} |
| 900 |
|
|
| 901 |
|
/** |
| 902 |
< |
* Returns true if this pool uses local first-in-first-out |
| 902 |
> |
* Returns {@code true} if this pool uses local first-in-first-out |
| 903 |
|
* scheduling mode for forked tasks that are never joined. |
| 904 |
|
* |
| 905 |
< |
* @return true if this pool uses async mode |
| 905 |
> |
* @return {@code true} if this pool uses async mode |
| 906 |
|
*/ |
| 907 |
|
public boolean getAsyncMode() { |
| 908 |
|
return locallyFifo; |
| 943 |
|
} |
| 944 |
|
|
| 945 |
|
/** |
| 946 |
< |
* Returns true if all worker threads are currently idle. An idle |
| 947 |
< |
* worker is one that cannot obtain a task to execute because none |
| 948 |
< |
* are available to steal from other threads, and there are no |
| 949 |
< |
* pending submissions to the pool. This method is conservative; |
| 950 |
< |
* it might not return true immediately upon idleness of all |
| 951 |
< |
* threads, but will eventually become true if threads remain |
| 952 |
< |
* inactive. |
| 946 |
> |
* Returns {@code true} if all worker threads are currently idle. |
| 947 |
> |
* An idle worker is one that cannot obtain a task to execute |
| 948 |
> |
* because none are available to steal from other threads, and |
| 949 |
> |
* there are no pending submissions to the pool. This method is |
| 950 |
> |
* conservative; it might not return {@code true} immediately upon |
| 951 |
> |
* idleness of all threads, but will eventually become true if |
| 952 |
> |
* threads remain inactive. |
| 953 |
|
* |
| 954 |
< |
* @return true if all threads are currently idle |
| 954 |
> |
* @return {@code true} if all threads are currently idle |
| 955 |
|
*/ |
| 956 |
|
public boolean isQuiescent() { |
| 957 |
|
return activeCountOf(runControl) == 0; |
| 1017 |
|
} |
| 1018 |
|
|
| 1019 |
|
/** |
| 1020 |
< |
* Returns true if there are any tasks submitted to this pool |
| 1021 |
< |
* that have not yet begun executing. |
| 1020 |
> |
* Returns {@code true} if there are any tasks submitted to this |
| 1021 |
> |
* pool that have not yet begun executing. |
| 1022 |
|
* |
| 1023 |
|
* @return {@code true} if there are any queued submissions |
| 1024 |
|
*/ |
| 1031 |
|
* available. This method may be useful in extensions to this |
| 1032 |
|
* class that re-assign work in systems with multiple pools. |
| 1033 |
|
* |
| 1034 |
< |
* @return the next submission, or null if none |
| 1034 |
> |
* @return the next submission, or {@code null} if none |
| 1035 |
|
*/ |
| 1036 |
|
protected ForkJoinTask<?> pollSubmission() { |
| 1037 |
|
return submissionQueue.poll(); |
| 1491 |
|
} |
| 1492 |
|
|
| 1493 |
|
/** |
| 1494 |
< |
* Returns true if worker waiting on sync can proceed: |
| 1494 |
> |
* Returns {@code true} if worker waiting on sync can proceed: |
| 1495 |
|
* - on signal (thread == null) |
| 1496 |
|
* - on event count advance (winning race to notify vs signaller) |
| 1497 |
|
* - on interrupt |
| 1499 |
|
* If node was not signalled and event count not advanced on exit, |
| 1500 |
|
* then we also help advance event count. |
| 1501 |
|
* |
| 1502 |
< |
* @return true if node can be released |
| 1502 |
> |
* @return {@code true} if node can be released |
| 1503 |
|
*/ |
| 1504 |
|
final boolean syncIsReleasable(WaitQueueNode node) { |
| 1505 |
|
long prev = node.count; |
| 1518 |
|
} |
| 1519 |
|
|
| 1520 |
|
/** |
| 1521 |
< |
* Returns true if a new sync event occurred since last call to |
| 1522 |
< |
* sync or this method, if so, updating caller's count. |
| 1521 |
> |
* Returns {@code true} if a new sync event occurred since last |
| 1522 |
> |
* call to sync or this method, if so, updating caller's count. |
| 1523 |
|
*/ |
| 1524 |
|
final boolean hasNewSyncEvent(ForkJoinWorkerThread w) { |
| 1525 |
|
long lc = w.lastEventCount; |
| 1603 |
|
} |
| 1604 |
|
|
| 1605 |
|
/** |
| 1606 |
< |
* Returns true if a spare thread appears to be needed. If |
| 1607 |
< |
* maintaining parallelism, returns true when the deficit in |
| 1606 |
> |
* Returns {@code true} if a spare thread appears to be needed. |
| 1607 |
> |
* If maintaining parallelism, returns true when the deficit in |
| 1608 |
|
* running threads is more than the surplus of total threads, and |
| 1609 |
|
* there is apparently some work to do. This self-limiting rule |
| 1610 |
|
* means that the more threads that have already been added, the |
| 1773 |
|
/** |
| 1774 |
|
* Interface for extending managed parallelism for tasks running |
| 1775 |
|
* in ForkJoinPools. A ManagedBlocker provides two methods. |
| 1776 |
< |
* Method {@code isReleasable} must return true if blocking is not |
| 1777 |
< |
* necessary. Method {@code block} blocks the current thread if |
| 1778 |
< |
* necessary (perhaps internally invoking {@code isReleasable} |
| 1779 |
< |
* before actually blocking.). |
| 1776 |
> |
* Method {@code isReleasable} must return {@code true} if |
| 1777 |
> |
* blocking is not necessary. Method {@code block} blocks the |
| 1778 |
> |
* current thread if necessary (perhaps internally invoking |
| 1779 |
> |
* {@code isReleasable} before actually blocking.). |
| 1780 |
|
* |
| 1781 |
|
* <p>For example, here is a ManagedBlocker based on a |
| 1782 |
|
* ReentrantLock: |
| 1800 |
|
* Possibly blocks the current thread, for example waiting for |
| 1801 |
|
* a lock or condition. |
| 1802 |
|
* |
| 1803 |
< |
* @return true if no additional blocking is necessary (i.e., |
| 1804 |
< |
* if isReleasable would return true) |
| 1803 |
> |
* @return {@code true} if no additional blocking is necessary |
| 1804 |
> |
* (i.e., if isReleasable would return true) |
| 1805 |
|
* @throws InterruptedException if interrupted while waiting |
| 1806 |
|
* (the method is not required to do so, but is allowed to) |
| 1807 |
|
*/ |
| 1808 |
|
boolean block() throws InterruptedException; |
| 1809 |
|
|
| 1810 |
|
/** |
| 1811 |
< |
* Returns true if blocking is unnecessary. |
| 1811 |
> |
* Returns {@code true} if blocking is unnecessary. |
| 1812 |
|
*/ |
| 1813 |
|
boolean isReleasable(); |
| 1814 |
|
} |
| 1818 |
|
* is a ForkJoinWorkerThread, this method possibly arranges for a |
| 1819 |
|
* spare thread to be activated if necessary to ensure parallelism |
| 1820 |
|
* while the current thread is blocked. If |
| 1821 |
< |
* {@code maintainParallelism} is true and the pool supports |
| 1821 |
> |
* {@code maintainParallelism} is {@code true} and the pool supports |
| 1822 |
|
* it ({@link #getMaintainsParallelism}), this method attempts to |
| 1823 |
|
* maintain the pool's nominal parallelism. Otherwise it activates |
| 1824 |
|
* a thread only if necessary to avoid complete starvation. This |
| 1836 |
|
* be expanded to ensure parallelism, and later adjusted. |
| 1837 |
|
* |
| 1838 |
|
* @param blocker the blocker |
| 1839 |
< |
* @param maintainParallelism if true and supported by this pool, |
| 1840 |
< |
* attempt to maintain the pool's nominal parallelism; otherwise |
| 1841 |
< |
* activate a thread only if necessary to avoid complete |
| 1842 |
< |
* starvation. |
| 1839 |
> |
* @param maintainParallelism if {@code true} and supported by |
| 1840 |
> |
* this pool, attempt to maintain the pool's nominal parallelism; |
| 1841 |
> |
* otherwise activate a thread only if necessary to avoid |
| 1842 |
> |
* complete starvation. |
| 1843 |
|
* @throws InterruptedException if blocker.block did so |
| 1844 |
|
*/ |
| 1845 |
|
public static void managedBlock(ManagedBlocker blocker, |
