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*/ |
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package jsr166y; |
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< |
import java.io.Serializable; |
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import java.util.*; |
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> |
|
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import java.util.concurrent.*; |
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import java.util.concurrent.atomic.*; |
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import sun.misc.Unsafe; |
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import java.lang.reflect.*; |
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|
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import java.io.Serializable; |
12 |
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import java.util.Collection; |
13 |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.WeakHashMap; |
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|
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/** |
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* Abstract base class for tasks that run within a {@link |
21 |
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* lighter weight than a normal thread. Huge numbers of tasks and |
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* subtasks may be hosted by a small number of actual threads in a |
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* ForkJoinPool, at the price of some usage limitations. |
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* |
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* |
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* <p> A "main" ForkJoinTask begins execution when submitted to a |
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* {@link ForkJoinPool}. Once started, it will usually in turn start |
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* other subtasks. As indicated by the name of this class, many |
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* programs using ForkJoinTasks employ only methods <code>fork</code> |
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* and <code>join</code>, or derivatives such as |
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* <code>invokeAll</code>. However, this class also provides a number |
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* programs using ForkJoinTasks employ only methods {@code fork} |
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* and {@code join}, or derivatives such as |
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* {@code invokeAll}. However, this class also provides a number |
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* of other methods that can come into play in advanced usages, as |
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* well as extension mechanics that allow support of new forms of |
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* fork/join processing. |
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* |
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* |
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* <p>A ForkJoinTask is a lightweight form of {@link Future}. The |
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* efficiency of ForkJoinTasks stems from a set of restrictions (that |
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* are only partially statically enforceable) reflecting their |
39 |
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* operating on purely isolated objects. The primary coordination |
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* mechanisms are {@link #fork}, that arranges asynchronous execution, |
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* and {@link #join}, that doesn't proceed until the task's result has |
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* been computed. Computations should avoid <code>synchronized</code> |
42 |
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* been computed. Computations should avoid {@code synchronized} |
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* methods or blocks, and should minimize other blocking |
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* synchronization apart from joining other tasks or using |
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* synchronizers such as Phasers that are advertised to cooperate with |
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* performance, and the potential to indefinitely stall if the number |
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* of threads not waiting for IO or other external synchronization |
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* becomes exhausted. This usage restriction is in part enforced by |
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* not permitting checked exceptions such as <code>IOExceptions</code> |
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* not permitting checked exceptions such as {@code IOExceptions} |
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* to be thrown. However, computations may still encounter unchecked |
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* exceptions, that are rethrown to callers attempting join |
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* them. These exceptions may additionally include |
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* <p>The primary method for awaiting completion and extracting |
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* results of a task is {@link #join}, but there are several variants: |
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* The {@link Future#get} methods support interruptible and/or timed |
64 |
< |
* waits for completion and report results using <code>Future</code> |
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> |
* waits for completion and report results using {@code Future} |
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* conventions. Method {@link #helpJoin} enables callers to actively |
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* execute other tasks while awaiting joins, which is sometimes more |
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* efficient but only applies when all subtasks are known to be |
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* strictly tree-structured. Method {@link #invoke} is semantically |
69 |
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* equivalent to <code>fork(); join()</code> but always attempts to |
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> |
* equivalent to {@code fork(); join()} but always attempts to |
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* begin execution in the current thread. The "<em>quiet</em>" forms |
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* of these methods do not extract results or report exceptions. These |
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* may be useful when a set of tasks are being executed, and you need |
73 |
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* to delay processing of results or exceptions until all complete. |
74 |
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* Method <code>invokeAll</code> (available in multiple versions) |
74 |
> |
* Method {@code invokeAll} (available in multiple versions) |
75 |
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* performs the most common form of parallel invocation: forking a set |
76 |
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* of tasks and joining them all. |
77 |
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* |
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* Instead, you subclass one of the abstract classes that support a |
80 |
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* particular style of fork/join processing. Normally, a concrete |
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* ForkJoinTask subclass declares fields comprising its parameters, |
82 |
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* established in a constructor, and then defines a <code>compute</code> |
82 |
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* established in a constructor, and then defines a {@code compute} |
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* method that somehow uses the control methods supplied by this base |
84 |
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* class. While these methods have <code>public</code> access (to allow |
84 |
> |
* class. While these methods have {@code public} access (to allow |
85 |
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* instances of different task subclasses to call each others |
86 |
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* methods), some of them may only be called from within other |
87 |
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* ForkJoinTasks. Attempts to invoke them in other contexts result in |
88 |
< |
* exceptions or errors including ClassCastException. |
87 |
> |
* ForkJoinTasks (as may be determined using method {@link |
88 |
> |
* #inForkJoinPool}). Attempts to invoke them in other contexts |
89 |
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* result in exceptions or errors, possibly including |
90 |
> |
* ClassCastException. |
91 |
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* |
92 |
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* <p>Most base support methods are <code>final</code> because their |
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> |
* <p>Most base support methods are {@code final} because their |
93 |
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* implementations are intrinsically tied to the underlying |
94 |
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* lightweight task scheduling framework, and so cannot be overridden. |
95 |
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* Developers creating new basic styles of fork/join processing should |
96 |
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* minimally implement <code>protected</code> methods |
97 |
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* <code>exec</code>, <code>setRawResult</code>, and |
98 |
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* <code>getRawResult</code>, while also introducing an abstract |
96 |
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* minimally implement {@code protected} methods |
97 |
> |
* {@code exec}, {@code setRawResult}, and |
98 |
> |
* {@code getRawResult}, while also introducing an abstract |
99 |
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* computational method that can be implemented in its subclasses, |
100 |
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* possibly relying on other <code>protected</code> methods provided |
100 |
> |
* possibly relying on other {@code protected} methods provided |
101 |
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* by this class. |
102 |
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* |
103 |
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* <p>ForkJoinTasks should perform relatively small amounts of |
104 |
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* computations, othewise splitting into smaller tasks. As a very |
104 |
> |
* computations, otherwise splitting into smaller tasks. As a very |
105 |
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* rough rule of thumb, a task should perform more than 100 and less |
106 |
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* than 10000 basic computational steps. If tasks are too big, then |
107 |
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* parellelism cannot improve throughput. If too small, then memory |
107 |
> |
* parallelism cannot improve throughput. If too small, then memory |
108 |
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* and internal task maintenance overhead may overwhelm processing. |
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* |
110 |
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* <p>ForkJoinTasks are <code>Serializable</code>, which enables them |
110 |
> |
* <p>ForkJoinTasks are {@code Serializable}, which enables them |
111 |
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* to be used in extensions such as remote execution frameworks. It is |
112 |
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* in general sensible to serialize tasks only before or after, but |
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* not during execution. Serialization is not relied on during |
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* execution itself. |
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* |
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* @since 1.7 |
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+ |
* @author Doug Lea |
118 |
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*/ |
119 |
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public abstract class ForkJoinTask<V> implements Future<V>, Serializable { |
120 |
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|
136 |
|
* currently unused. Also value 0x80000000 is available as spare |
137 |
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* completion value. |
138 |
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*/ |
139 |
< |
volatile int status; // accessed directy by pool and workers |
139 |
> |
volatile int status; // accessed directly by pool and workers |
140 |
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|
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static final int COMPLETION_MASK = 0xe0000000; |
142 |
|
static final int NORMAL = 0xe0000000; // == mask |
149 |
|
/** |
150 |
|
* Table of exceptions thrown by tasks, to enable reporting by |
151 |
|
* callers. Because exceptions are rare, we don't directly keep |
152 |
< |
* them with task objects, but instead us a weak ref table. Note |
152 |
> |
* them with task objects, but instead use a weak ref table. Note |
153 |
|
* that cancellation exceptions don't appear in the table, but are |
154 |
|
* instead recorded as status values. |
155 |
< |
* Todo: Use ConcurrentReferenceHashMap |
155 |
> |
* TODO: Use ConcurrentReferenceHashMap |
156 |
|
*/ |
157 |
|
static final Map<ForkJoinTask<?>, Throwable> exceptionMap = |
158 |
|
Collections.synchronizedMap |
161 |
|
// within-package utilities |
162 |
|
|
163 |
|
/** |
164 |
< |
* Get current worker thread, or null if not a worker thread |
164 |
> |
* Gets current worker thread, or null if not a worker thread. |
165 |
|
*/ |
166 |
|
static ForkJoinWorkerThread getWorker() { |
167 |
|
Thread t = Thread.currentThread(); |
168 |
< |
return ((t instanceof ForkJoinWorkerThread)? |
169 |
< |
(ForkJoinWorkerThread)t : null); |
168 |
> |
return ((t instanceof ForkJoinWorkerThread) ? |
169 |
> |
(ForkJoinWorkerThread) t : null); |
170 |
|
} |
171 |
|
|
172 |
|
final boolean casStatus(int cmp, int val) { |
173 |
< |
return _unsafe.compareAndSwapInt(this, statusOffset, cmp, val); |
173 |
> |
return UNSAFE.compareAndSwapInt(this, statusOffset, cmp, val); |
174 |
|
} |
175 |
|
|
176 |
|
/** |
178 |
|
*/ |
179 |
|
static void rethrowException(Throwable ex) { |
180 |
|
if (ex != null) |
181 |
< |
_unsafe.throwException(ex); |
181 |
> |
UNSAFE.throwException(ex); |
182 |
|
} |
183 |
|
|
184 |
|
// Setting completion status |
185 |
|
|
186 |
|
/** |
187 |
< |
* Mark completion and wake up threads waiting to join this task. |
187 |
> |
* Marks completion and wakes up threads waiting to join this task. |
188 |
> |
* |
189 |
|
* @param completion one of NORMAL, CANCELLED, EXCEPTIONAL |
190 |
|
*/ |
191 |
|
final void setCompletion(int completion) { |
192 |
|
ForkJoinPool pool = getPool(); |
193 |
|
if (pool != null) { |
194 |
|
int s; // Clear signal bits while setting completion status |
195 |
< |
do;while ((s = status) >= 0 && !casStatus(s, completion)); |
195 |
> |
do {} while ((s = status) >= 0 && !casStatus(s, completion)); |
196 |
|
|
197 |
|
if ((s & SIGNAL_MASK) != 0) { |
198 |
|
if ((s &= INTERNAL_SIGNAL_MASK) != 0) |
199 |
|
pool.updateRunningCount(s); |
200 |
< |
synchronized(this) { notifyAll(); } |
200 |
> |
synchronized (this) { notifyAll(); } |
201 |
|
} |
202 |
|
} |
203 |
|
else |
210 |
|
*/ |
211 |
|
private void externallySetCompletion(int completion) { |
212 |
|
int s; |
213 |
< |
do;while ((s = status) >= 0 && |
214 |
< |
!casStatus(s, (s & SIGNAL_MASK) | completion)); |
215 |
< |
synchronized(this) { notifyAll(); } |
213 |
> |
do {} while ((s = status) >= 0 && |
214 |
> |
!casStatus(s, (s & SIGNAL_MASK) | completion)); |
215 |
> |
synchronized (this) { notifyAll(); } |
216 |
|
} |
217 |
|
|
218 |
|
/** |
219 |
< |
* Sets status to indicate normal completion |
219 |
> |
* Sets status to indicate normal completion. |
220 |
|
*/ |
221 |
|
final void setNormalCompletion() { |
222 |
|
// Try typical fast case -- single CAS, no signal, not already done. |
223 |
|
// Manually expand casStatus to improve chances of inlining it |
224 |
< |
if (!_unsafe.compareAndSwapInt(this, statusOffset, 0, NORMAL)) |
224 |
> |
if (!UNSAFE.compareAndSwapInt(this, statusOffset, 0, NORMAL)) |
225 |
|
setCompletion(NORMAL); |
226 |
|
} |
227 |
|
|
228 |
|
// internal waiting and notification |
229 |
|
|
230 |
|
/** |
231 |
< |
* Performs the actual monitor wait for awaitDone |
231 |
> |
* Performs the actual monitor wait for awaitDone. |
232 |
|
*/ |
233 |
|
private void doAwaitDone() { |
234 |
|
// Minimize lock bias and in/de-flation effects by maximizing |
235 |
|
// chances of waiting inside sync |
236 |
|
try { |
237 |
|
while (status >= 0) |
238 |
< |
synchronized(this) { if (status >= 0) wait(); } |
238 |
> |
synchronized (this) { if (status >= 0) wait(); } |
239 |
|
} catch (InterruptedException ie) { |
240 |
|
onInterruptedWait(); |
241 |
|
} |
242 |
|
} |
243 |
|
|
244 |
|
/** |
245 |
< |
* Performs the actual monitor wait for awaitDone |
245 |
> |
* Performs the actual timed monitor wait for awaitDone. |
246 |
|
*/ |
247 |
|
private void doAwaitDone(long startTime, long nanos) { |
248 |
< |
synchronized(this) { |
248 |
> |
synchronized (this) { |
249 |
|
try { |
250 |
|
while (status >= 0) { |
251 |
|
long nt = nanos - System.nanoTime() - startTime; |
252 |
|
if (nt <= 0) |
253 |
|
break; |
254 |
< |
wait(nt / 1000000, (int)(nt % 1000000)); |
254 |
> |
wait(nt / 1000000, (int) (nt % 1000000)); |
255 |
|
} |
256 |
|
} catch (InterruptedException ie) { |
257 |
|
onInterruptedWait(); |
264 |
|
/** |
265 |
|
* Sets status to indicate there is joiner, then waits for join, |
266 |
|
* surrounded with pool notifications. |
267 |
+ |
* |
268 |
|
* @return status upon exit |
269 |
|
*/ |
270 |
< |
private int awaitDone(ForkJoinWorkerThread w, boolean maintainParallelism) { |
271 |
< |
ForkJoinPool pool = w == null? null : w.pool; |
270 |
> |
private int awaitDone(ForkJoinWorkerThread w, |
271 |
> |
boolean maintainParallelism) { |
272 |
> |
ForkJoinPool pool = (w == null) ? null : w.pool; |
273 |
|
int s; |
274 |
|
while ((s = status) >= 0) { |
275 |
< |
if (casStatus(s, pool == null? s|EXTERNAL_SIGNAL : s+1)) { |
275 |
> |
if (casStatus(s, (pool == null) ? s|EXTERNAL_SIGNAL : s+1)) { |
276 |
|
if (pool == null || !pool.preJoin(this, maintainParallelism)) |
277 |
|
doAwaitDone(); |
278 |
|
if (((s = status) & INTERNAL_SIGNAL_MASK) != 0) |
285 |
|
|
286 |
|
/** |
287 |
|
* Timed version of awaitDone |
288 |
+ |
* |
289 |
|
* @return status upon exit |
290 |
|
*/ |
291 |
|
private int awaitDone(ForkJoinWorkerThread w, long nanos) { |
292 |
< |
ForkJoinPool pool = w == null? null : w.pool; |
292 |
> |
ForkJoinPool pool = (w == null) ? null : w.pool; |
293 |
|
int s; |
294 |
|
while ((s = status) >= 0) { |
295 |
< |
if (casStatus(s, pool == null? s|EXTERNAL_SIGNAL : s+1)) { |
295 |
> |
if (casStatus(s, (pool == null) ? s|EXTERNAL_SIGNAL : s+1)) { |
296 |
|
long startTime = System.nanoTime(); |
297 |
|
if (pool == null || !pool.preJoin(this, false)) |
298 |
|
doAwaitDone(startTime, nanos); |
309 |
|
} |
310 |
|
|
311 |
|
/** |
312 |
< |
* Notify pool that thread is unblocked. Called by signalled |
312 |
> |
* Notifies pool that thread is unblocked. Called by signalled |
313 |
|
* threads when woken by non-FJ threads (which is atypical). |
314 |
|
*/ |
315 |
|
private void adjustPoolCountsOnUnblock(ForkJoinPool pool) { |
316 |
|
int s; |
317 |
< |
do;while ((s = status) < 0 && !casStatus(s, s & COMPLETION_MASK)); |
317 |
> |
do {} while ((s = status) < 0 && !casStatus(s, s & COMPLETION_MASK)); |
318 |
|
if (pool != null && (s &= INTERNAL_SIGNAL_MASK) != 0) |
319 |
|
pool.updateRunningCount(s); |
320 |
|
} |
321 |
|
|
322 |
|
/** |
323 |
< |
* Notify pool to adjust counts on cancelled or timed out wait |
323 |
> |
* Notifies pool to adjust counts on cancelled or timed out wait. |
324 |
|
*/ |
325 |
|
private void adjustPoolCountsOnCancelledWait(ForkJoinPool pool) { |
326 |
|
if (pool != null) { |
335 |
|
} |
336 |
|
|
337 |
|
/** |
338 |
< |
* Handle interruptions during waits. |
338 |
> |
* Handles interruptions during waits. |
339 |
|
*/ |
340 |
|
private void onInterruptedWait() { |
341 |
|
ForkJoinWorkerThread w = getWorker(); |
354 |
|
} |
355 |
|
|
356 |
|
/** |
357 |
< |
* Throws the exception associated with status s; |
357 |
> |
* Throws the exception associated with status s. |
358 |
> |
* |
359 |
|
* @throws the exception |
360 |
|
*/ |
361 |
|
private void reportException(int s) { |
368 |
|
} |
369 |
|
|
370 |
|
/** |
371 |
< |
* Returns result or throws exception using j.u.c.Future conventions |
372 |
< |
* Only call when isDone known to be true. |
371 |
> |
* Returns result or throws exception using j.u.c.Future conventions. |
372 |
> |
* Only call when {@code isDone} known to be true. |
373 |
|
*/ |
374 |
|
private V reportFutureResult() |
375 |
|
throws ExecutionException, InterruptedException { |
388 |
|
|
389 |
|
/** |
390 |
|
* Returns result or throws exception using j.u.c.Future conventions |
391 |
< |
* with timeouts |
391 |
> |
* with timeouts. |
392 |
|
*/ |
393 |
|
private V reportTimedFutureResult() |
394 |
|
throws InterruptedException, ExecutionException, TimeoutException { |
409 |
|
|
410 |
|
/** |
411 |
|
* Calls exec, recording completion, and rethrowing exception if |
412 |
< |
* encountered. Caller should normally check status before calling |
412 |
> |
* encountered. Caller should normally check status before calling. |
413 |
> |
* |
414 |
|
* @return true if completed normally |
415 |
|
*/ |
416 |
|
private boolean tryExec() { |
428 |
|
|
429 |
|
/** |
430 |
|
* Main execution method used by worker threads. Invokes |
431 |
< |
* base computation unless already complete |
431 |
> |
* base computation unless already complete. |
432 |
|
*/ |
433 |
|
final void quietlyExec() { |
434 |
|
if (status >= 0) { |
435 |
|
try { |
436 |
|
if (!exec()) |
437 |
|
return; |
438 |
< |
} catch(Throwable rex) { |
438 |
> |
} catch (Throwable rex) { |
439 |
|
setDoneExceptionally(rex); |
440 |
|
return; |
441 |
|
} |
444 |
|
} |
445 |
|
|
446 |
|
/** |
447 |
< |
* Calls exec, recording but not rethrowing exception |
448 |
< |
* Caller should normally check status before calling |
447 |
> |
* Calls exec(), recording but not rethrowing exception. |
448 |
> |
* Caller should normally check status before calling. |
449 |
> |
* |
450 |
|
* @return true if completed normally |
451 |
|
*/ |
452 |
|
private boolean tryQuietlyInvoke() { |
462 |
|
} |
463 |
|
|
464 |
|
/** |
465 |
< |
* Cancel, ignoring any exceptions it throws |
465 |
> |
* Cancels, ignoring any exceptions it throws. |
466 |
|
*/ |
467 |
|
final void cancelIgnoringExceptions() { |
468 |
|
try { |
469 |
|
cancel(false); |
470 |
< |
} catch(Throwable ignore) { |
470 |
> |
} catch (Throwable ignore) { |
471 |
|
} |
472 |
|
} |
473 |
|
|
479 |
|
ForkJoinTask<?> t; |
480 |
|
while ((s = status) >= 0 && (t = w.scanWhileJoining(this)) != null) |
481 |
|
t.quietlyExec(); |
482 |
< |
return (s >= 0)? awaitDone(w, false) : s; // block if no work |
482 |
> |
return (s >= 0) ? awaitDone(w, false) : s; // block if no work |
483 |
|
} |
484 |
|
|
485 |
|
// public methods |
489 |
|
* necessarily enforced, it is a usage error to fork a task more |
490 |
|
* than once unless it has completed and been reinitialized. This |
491 |
|
* method may be invoked only from within ForkJoinTask |
492 |
< |
* computations. Attempts to invoke in other contexts result in |
493 |
< |
* exceptions or errors including ClassCastException. |
492 |
> |
* computations (as may be determined using method {@link |
493 |
> |
* #inForkJoinPool}). Attempts to invoke in other contexts result |
494 |
> |
* in exceptions or errors, possibly including ClassCastException. |
495 |
|
*/ |
496 |
|
public final void fork() { |
497 |
< |
((ForkJoinWorkerThread)(Thread.currentThread())).pushTask(this); |
497 |
> |
((ForkJoinWorkerThread) Thread.currentThread()) |
498 |
> |
.pushTask(this); |
499 |
|
} |
500 |
|
|
501 |
|
/** |
502 |
|
* Returns the result of the computation when it is ready. |
503 |
< |
* This method differs from <code>get</code> in that abnormal |
503 |
> |
* This method differs from {@code get} in that abnormal |
504 |
|
* completion results in RuntimeExceptions or Errors, not |
505 |
|
* ExecutionExceptions. |
506 |
|
* |
516 |
|
/** |
517 |
|
* Commences performing this task, awaits its completion if |
518 |
|
* necessary, and return its result. |
519 |
+ |
* |
520 |
|
* @throws Throwable (a RuntimeException, Error, or unchecked |
521 |
< |
* exception) if the underlying computation did so. |
521 |
> |
* exception) if the underlying computation did so |
522 |
|
* @return the computed result |
523 |
|
*/ |
524 |
|
public final V invoke() { |
529 |
|
} |
530 |
|
|
531 |
|
/** |
532 |
< |
* Forks both tasks, returning when <code>isDone</code> holds for |
532 |
> |
* Forks both tasks, returning when {@code isDone} holds for |
533 |
|
* both of them or an exception is encountered. This method may be |
534 |
< |
* invoked only from within ForkJoinTask computations. Attempts to |
535 |
< |
* invoke in other contexts result in exceptions or errors |
536 |
< |
* including ClassCastException. |
534 |
> |
* invoked only from within ForkJoinTask computations (as may be |
535 |
> |
* determined using method {@link #inForkJoinPool}). Attempts to |
536 |
> |
* invoke in other contexts result in exceptions or errors, |
537 |
> |
* possibly including ClassCastException. |
538 |
> |
* |
539 |
|
* @param t1 one task |
540 |
|
* @param t2 the other task |
541 |
|
* @throws NullPointerException if t1 or t2 are null |
542 |
< |
* @throws RuntimeException or Error if either task did so. |
542 |
> |
* @throws RuntimeException or Error if either task did so |
543 |
|
*/ |
544 |
|
public static void invokeAll(ForkJoinTask<?>t1, ForkJoinTask<?> t2) { |
545 |
|
t2.fork(); |
548 |
|
} |
549 |
|
|
550 |
|
/** |
551 |
< |
* Forks the given tasks, returning when <code>isDone</code> holds |
551 |
> |
* Forks the given tasks, returning when {@code isDone} holds |
552 |
|
* for all of them. If any task encounters an exception, others |
553 |
|
* may be cancelled. This method may be invoked only from within |
554 |
< |
* ForkJoinTask computations. Attempts to invoke in other contexts |
555 |
< |
* result in exceptions or errors including ClassCastException. |
554 |
> |
* ForkJoinTask computations (as may be determined using method |
555 |
> |
* {@link #inForkJoinPool}). Attempts to invoke in other contexts |
556 |
> |
* result in exceptions or errors, possibly including |
557 |
> |
* ClassCastException. |
558 |
> |
* |
559 |
|
* @param tasks the array of tasks |
560 |
< |
* @throws NullPointerException if tasks or any element are null. |
561 |
< |
* @throws RuntimeException or Error if any task did so. |
560 |
> |
* @throws NullPointerException if tasks or any element are null |
561 |
> |
* @throws RuntimeException or Error if any task did so |
562 |
|
*/ |
563 |
|
public static void invokeAll(ForkJoinTask<?>... tasks) { |
564 |
|
Throwable ex = null; |
595 |
|
|
596 |
|
/** |
597 |
|
* Forks all tasks in the collection, returning when |
598 |
< |
* <code>isDone</code> holds for all of them. If any task |
598 |
> |
* {@code isDone} holds for all of them. If any task |
599 |
|
* encounters an exception, others may be cancelled. This method |
600 |
< |
* may be invoked only from within ForkJoinTask |
601 |
< |
* computations. Attempts to invoke in other contexts resul!t in |
602 |
< |
* exceptions or errors including ClassCastException. |
600 |
> |
* may be invoked only from within ForkJoinTask computations (as |
601 |
> |
* may be determined using method {@link |
602 |
> |
* #inForkJoinPool}). Attempts to invoke in other contexts result |
603 |
> |
* in exceptions or errors, possibly including ClassCastException. |
604 |
> |
* |
605 |
|
* @param tasks the collection of tasks |
606 |
< |
* @throws NullPointerException if tasks or any element are null. |
607 |
< |
* @throws RuntimeException or Error if any task did so. |
606 |
> |
* @throws NullPointerException if tasks or any element are null |
607 |
> |
* @throws RuntimeException or Error if any task did so |
608 |
|
*/ |
609 |
|
public static void invokeAll(Collection<? extends ForkJoinTask<?>> tasks) { |
610 |
< |
if (!(tasks instanceof List)) { |
611 |
< |
invokeAll(tasks.toArray(new ForkJoinTask[tasks.size()])); |
610 |
> |
if (!(tasks instanceof List<?>)) { |
611 |
> |
invokeAll(tasks.toArray(new ForkJoinTask<?>[tasks.size()])); |
612 |
|
return; |
613 |
|
} |
614 |
+ |
@SuppressWarnings("unchecked") |
615 |
|
List<? extends ForkJoinTask<?>> ts = |
616 |
< |
(List<? extends ForkJoinTask<?>>)tasks; |
616 |
> |
(List<? extends ForkJoinTask<?>>) tasks; |
617 |
|
Throwable ex = null; |
618 |
|
int last = ts.size() - 1; |
619 |
|
for (int i = last; i >= 0; --i) { |
649 |
|
/** |
650 |
|
* Returns true if the computation performed by this task has |
651 |
|
* completed (or has been cancelled). |
652 |
+ |
* |
653 |
|
* @return true if this computation has completed |
654 |
|
*/ |
655 |
|
public final boolean isDone() { |
658 |
|
|
659 |
|
/** |
660 |
|
* Returns true if this task was cancelled. |
661 |
+ |
* |
662 |
|
* @return true if this task was cancelled |
663 |
|
*/ |
664 |
|
public final boolean isCancelled() { |
667 |
|
|
668 |
|
/** |
669 |
|
* Asserts that the results of this task's computation will not be |
670 |
< |
* used. If a cancellation occurs before atempting to execute this |
671 |
< |
* task, then execution will be suppressed, <code>isCancelled</code> |
672 |
< |
* will report true, and <code>join</code> will result in a |
673 |
< |
* <code>CancellationException</code> being thrown. Otherwise, when |
670 |
> |
* used. If a cancellation occurs before attempting to execute this |
671 |
> |
* task, then execution will be suppressed, {@code isCancelled} |
672 |
> |
* will report true, and {@code join} will result in a |
673 |
> |
* {@code CancellationException} being thrown. Otherwise, when |
674 |
|
* cancellation races with completion, there are no guarantees |
675 |
< |
* about whether <code>isCancelled</code> will report true, whether |
676 |
< |
* <code>join</code> will return normally or via an exception, or |
675 |
> |
* about whether {@code isCancelled} will report true, whether |
676 |
> |
* {@code join} will return normally or via an exception, or |
677 |
|
* whether these behaviors will remain consistent upon repeated |
678 |
|
* invocation. |
679 |
|
* |
684 |
|
* <p> This method is designed to be invoked by <em>other</em> |
685 |
|
* tasks. To terminate the current task, you can just return or |
686 |
|
* throw an unchecked exception from its computation method, or |
687 |
< |
* invoke <code>completeExceptionally</code>. |
687 |
> |
* invoke {@code completeExceptionally}. |
688 |
|
* |
689 |
|
* @param mayInterruptIfRunning this value is ignored in the |
690 |
|
* default implementation because tasks are not in general |
691 |
< |
* cancelled via interruption. |
691 |
> |
* cancelled via interruption |
692 |
|
* |
693 |
|
* @return true if this task is now cancelled |
694 |
|
*/ |
698 |
|
} |
699 |
|
|
700 |
|
/** |
701 |
< |
* Returns true if this task threw an exception or was cancelled |
701 |
> |
* Returns true if this task threw an exception or was cancelled. |
702 |
> |
* |
703 |
|
* @return true if this task threw an exception or was cancelled |
704 |
|
*/ |
705 |
|
public final boolean isCompletedAbnormally() { |
710 |
|
* Returns the exception thrown by the base computation, or a |
711 |
|
* CancellationException if cancelled, or null if none or if the |
712 |
|
* method has not yet completed. |
713 |
+ |
* |
714 |
|
* @return the exception, or null if none |
715 |
|
*/ |
716 |
|
public final Throwable getException() { |
725 |
|
/** |
726 |
|
* Completes this task abnormally, and if not already aborted or |
727 |
|
* cancelled, causes it to throw the given exception upon |
728 |
< |
* <code>join</code> and related operations. This method may be used |
728 |
> |
* {@code join} and related operations. This method may be used |
729 |
|
* to induce exceptions in asynchronous tasks, or to force |
730 |
|
* completion of tasks that would not otherwise complete. Its use |
731 |
|
* in other situations is likely to be wrong. This method is |
732 |
< |
* overridable, but overridden versions must invoke <code>super</code> |
732 |
> |
* overridable, but overridden versions must invoke {@code super} |
733 |
|
* implementation to maintain guarantees. |
734 |
|
* |
735 |
|
* @param ex the exception to throw. If this exception is |
738 |
|
*/ |
739 |
|
public void completeExceptionally(Throwable ex) { |
740 |
|
setDoneExceptionally((ex instanceof RuntimeException) || |
741 |
< |
(ex instanceof Error)? ex : |
741 |
> |
(ex instanceof Error) ? ex : |
742 |
|
new RuntimeException(ex)); |
743 |
|
} |
744 |
|
|
745 |
|
/** |
746 |
|
* Completes this task, and if not already aborted or cancelled, |
747 |
< |
* returning a <code>null</code> result upon <code>join</code> and related |
747 |
> |
* returning a {@code null} result upon {@code join} and related |
748 |
|
* operations. This method may be used to provide results for |
749 |
|
* asynchronous tasks, or to provide alternative handling for |
750 |
|
* tasks that would not otherwise complete normally. Its use in |
751 |
|
* other situations is likely to be wrong. This method is |
752 |
< |
* overridable, but overridden versions must invoke <code>super</code> |
752 |
> |
* overridable, but overridden versions must invoke {@code super} |
753 |
|
* implementation to maintain guarantees. |
754 |
|
* |
755 |
< |
* @param value the result value for this task. |
755 |
> |
* @param value the result value for this task |
756 |
|
*/ |
757 |
|
public void complete(V value) { |
758 |
|
try { |
759 |
|
setRawResult(value); |
760 |
< |
} catch(Throwable rex) { |
760 |
> |
} catch (Throwable rex) { |
761 |
|
setDoneExceptionally(rex); |
762 |
|
return; |
763 |
|
} |
782 |
|
/** |
783 |
|
* Possibly executes other tasks until this task is ready, then |
784 |
|
* returns the result of the computation. This method may be more |
785 |
< |
* efficient than <code>join</code>, but is only applicable when |
786 |
< |
* there are no potemtial dependencies between continuation of the |
785 |
> |
* efficient than {@code join}, but is only applicable when |
786 |
> |
* there are no potential dependencies between continuation of the |
787 |
|
* current task and that of any other task that might be executed |
788 |
|
* while helping. (This usually holds for pure divide-and-conquer |
789 |
|
* tasks). This method may be invoked only from within |
790 |
< |
* ForkJoinTask computations. Attempts to invoke in other contexts |
791 |
< |
* resul!t in exceptions or errors including ClassCastException. |
790 |
> |
* ForkJoinTask computations (as may be determined using method |
791 |
> |
* {@link #inForkJoinPool}). Attempts to invoke in other contexts |
792 |
> |
* result in exceptions or errors, possibly including |
793 |
> |
* ClassCastException. |
794 |
> |
* |
795 |
|
* @return the computed result |
796 |
|
*/ |
797 |
|
public final V helpJoin() { |
798 |
< |
ForkJoinWorkerThread w = (ForkJoinWorkerThread)(Thread.currentThread()); |
798 |
> |
ForkJoinWorkerThread w = (ForkJoinWorkerThread) Thread.currentThread(); |
799 |
|
if (status < 0 || !w.unpushTask(this) || !tryExec()) |
800 |
|
reportException(busyJoin(w)); |
801 |
|
return getRawResult(); |
804 |
|
/** |
805 |
|
* Possibly executes other tasks until this task is ready. This |
806 |
|
* method may be invoked only from within ForkJoinTask |
807 |
< |
* computations. Attempts to invoke in other contexts resul!t in |
808 |
< |
* exceptions or errors including ClassCastException. |
807 |
> |
* computations (as may be determined using method {@link |
808 |
> |
* #inForkJoinPool}). Attempts to invoke in other contexts result |
809 |
> |
* in exceptions or errors, possibly including ClassCastException. |
810 |
|
*/ |
811 |
|
public final void quietlyHelpJoin() { |
812 |
|
if (status >= 0) { |
813 |
|
ForkJoinWorkerThread w = |
814 |
< |
(ForkJoinWorkerThread)(Thread.currentThread()); |
814 |
> |
(ForkJoinWorkerThread) Thread.currentThread(); |
815 |
|
if (!w.unpushTask(this) || !tryQuietlyInvoke()) |
816 |
|
busyJoin(w); |
817 |
|
} |
850 |
|
* joined, instead executing them until all are processed. |
851 |
|
*/ |
852 |
|
public static void helpQuiesce() { |
853 |
< |
((ForkJoinWorkerThread)(Thread.currentThread())). |
854 |
< |
helpQuiescePool(); |
853 |
> |
((ForkJoinWorkerThread) Thread.currentThread()) |
854 |
> |
.helpQuiescePool(); |
855 |
|
} |
856 |
|
|
857 |
|
/** |
858 |
|
* Resets the internal bookkeeping state of this task, allowing a |
859 |
< |
* subsequent <code>fork</code>. This method allows repeated reuse of |
859 |
> |
* subsequent {@code fork}. This method allows repeated reuse of |
860 |
|
* this task, but only if reuse occurs when this task has either |
861 |
|
* never been forked, or has been forked, then completed and all |
862 |
|
* outstanding joins of this task have also completed. Effects |
872 |
|
|
873 |
|
/** |
874 |
|
* Returns the pool hosting the current task execution, or null |
875 |
< |
* if this task is executing outside of any pool. |
876 |
< |
* @return the pool, or null if none. |
875 |
> |
* if this task is executing outside of any ForkJoinPool. |
876 |
> |
* |
877 |
> |
* @return the pool, or null if none |
878 |
|
*/ |
879 |
|
public static ForkJoinPool getPool() { |
880 |
|
Thread t = Thread.currentThread(); |
881 |
< |
return ((t instanceof ForkJoinWorkerThread)? |
882 |
< |
((ForkJoinWorkerThread)t).pool : null); |
881 |
> |
return (t instanceof ForkJoinWorkerThread) ? |
882 |
> |
((ForkJoinWorkerThread) t).pool : null; |
883 |
> |
} |
884 |
> |
|
885 |
> |
/** |
886 |
> |
* Returns {@code true} if the current thread is executing as a |
887 |
> |
* ForkJoinPool computation. |
888 |
> |
* |
889 |
> |
* @return {@code true} if the current thread is executing as a |
890 |
> |
* ForkJoinPool computation, or false otherwise |
891 |
> |
*/ |
892 |
> |
public static boolean inForkJoinPool() { |
893 |
> |
return Thread.currentThread() instanceof ForkJoinWorkerThread; |
894 |
|
} |
895 |
|
|
896 |
|
/** |
900 |
|
* another thread. This method may be useful when arranging |
901 |
|
* alternative local processing of tasks that could have been, but |
902 |
|
* were not, stolen. This method may be invoked only from within |
903 |
< |
* ForkJoinTask computations. Attempts to invoke in other contexts |
904 |
< |
* result in exceptions or errors including ClassCastException. |
903 |
> |
* ForkJoinTask computations (as may be determined using method |
904 |
> |
* {@link #inForkJoinPool}). Attempts to invoke in other contexts |
905 |
> |
* result in exceptions or errors, possibly including |
906 |
> |
* ClassCastException. |
907 |
> |
* |
908 |
|
* @return true if unforked |
909 |
|
*/ |
910 |
|
public boolean tryUnfork() { |
911 |
< |
return ((ForkJoinWorkerThread)(Thread.currentThread())).unpushTask(this); |
911 |
> |
return ((ForkJoinWorkerThread) Thread.currentThread()) |
912 |
> |
.unpushTask(this); |
913 |
|
} |
914 |
|
|
915 |
|
/** |
917 |
|
* forked by the current worker thread but not yet executed. This |
918 |
|
* value may be useful for heuristic decisions about whether to |
919 |
|
* fork other tasks. |
920 |
+ |
* |
921 |
|
* @return the number of tasks |
922 |
|
*/ |
923 |
|
public static int getQueuedTaskCount() { |
924 |
< |
return ((ForkJoinWorkerThread)(Thread.currentThread())). |
925 |
< |
getQueueSize(); |
924 |
> |
return ((ForkJoinWorkerThread) Thread.currentThread()) |
925 |
> |
.getQueueSize(); |
926 |
|
} |
927 |
|
|
928 |
|
/** |
929 |
< |
* Returns a estimate of how many more locally queued tasks are |
929 |
> |
* Returns an estimate of how many more locally queued tasks are |
930 |
|
* held by the current worker thread than there are other worker |
931 |
|
* threads that might steal them. This value may be useful for |
932 |
|
* heuristic decisions about whether to fork other tasks. In many |
934 |
|
* aim to maintain a small constant surplus (for example, 3) of |
935 |
|
* tasks, and to process computations locally if this threshold is |
936 |
|
* exceeded. |
937 |
+ |
* |
938 |
|
* @return the surplus number of tasks, which may be negative |
939 |
|
*/ |
940 |
|
public static int getSurplusQueuedTaskCount() { |
941 |
< |
return ((ForkJoinWorkerThread)(Thread.currentThread())) |
941 |
> |
return ((ForkJoinWorkerThread) Thread.currentThread()) |
942 |
|
.getEstimatedSurplusTaskCount(); |
943 |
|
} |
944 |
|
|
945 |
|
// Extension methods |
946 |
|
|
947 |
|
/** |
948 |
< |
* Returns the result that would be returned by <code>join</code>, |
948 |
> |
* Returns the result that would be returned by {@code join}, |
949 |
|
* even if this task completed abnormally, or null if this task is |
950 |
|
* not known to have been completed. This method is designed to |
951 |
|
* aid debugging, as well as to support extensions. Its use in any |
952 |
|
* other context is discouraged. |
953 |
|
* |
954 |
< |
* @return the result, or null if not completed. |
954 |
> |
* @return the result, or null if not completed |
955 |
|
*/ |
956 |
|
public abstract V getRawResult(); |
957 |
|
|
970 |
|
* called otherwise. The return value controls whether this task |
971 |
|
* is considered to be done normally. It may return false in |
972 |
|
* asynchronous actions that require explicit invocations of |
973 |
< |
* <code>complete</code> to become joinable. It may throw exceptions |
973 |
> |
* {@code complete} to become joinable. It may throw exceptions |
974 |
|
* to indicate abnormal exit. |
975 |
+ |
* |
976 |
|
* @return true if completed normally |
977 |
|
* @throws Error or RuntimeException if encountered during computation |
978 |
|
*/ |
979 |
|
protected abstract boolean exec(); |
980 |
|
|
981 |
|
/** |
982 |
< |
* Returns, but does not unschedule or execute, the task most |
983 |
< |
* recently forked by the current thread but not yet executed, if |
984 |
< |
* one is available. There is no guarantee that this task will |
985 |
< |
* actually be polled or executed next. |
986 |
< |
* This method is designed primarily to support extensions, |
987 |
< |
* and is unlikely to be useful otherwise. |
982 |
> |
* Returns, but does not unschedule or execute, the task queued by |
983 |
> |
* the current thread but not yet executed, if one is |
984 |
> |
* available. There is no guarantee that this task will actually |
985 |
> |
* be polled or executed next. This method is designed primarily |
986 |
> |
* to support extensions, and is unlikely to be useful otherwise. |
987 |
> |
* This method may be invoked only from within ForkJoinTask |
988 |
> |
* computations (as may be determined using method {@link |
989 |
> |
* #inForkJoinPool}). Attempts to invoke in other contexts result |
990 |
> |
* in exceptions or errors, possibly including ClassCastException. |
991 |
|
* |
992 |
|
* @return the next task, or null if none are available |
993 |
|
*/ |
994 |
|
protected static ForkJoinTask<?> peekNextLocalTask() { |
995 |
< |
return ((ForkJoinWorkerThread)(Thread.currentThread())).peekTask(); |
995 |
> |
return ((ForkJoinWorkerThread) Thread.currentThread()) |
996 |
> |
.peekTask(); |
997 |
|
} |
998 |
|
|
999 |
|
/** |
1000 |
< |
* Unschedules and returns, without executing, the task most |
1001 |
< |
* recently forked by the current thread but not yet executed. |
1002 |
< |
* This method is designed primarily to support extensions, |
1003 |
< |
* and is unlikely to be useful otherwise. |
1000 |
> |
* Unschedules and returns, without executing, the next task |
1001 |
> |
* queued by the current thread but not yet executed. This method |
1002 |
> |
* is designed primarily to support extensions, and is unlikely to |
1003 |
> |
* be useful otherwise. This method may be invoked only from |
1004 |
> |
* within ForkJoinTask computations (as may be determined using |
1005 |
> |
* method {@link #inForkJoinPool}). Attempts to invoke in other |
1006 |
> |
* contexts result in exceptions or errors, possibly including |
1007 |
> |
* ClassCastException. |
1008 |
|
* |
1009 |
|
* @return the next task, or null if none are available |
1010 |
|
*/ |
1011 |
|
protected static ForkJoinTask<?> pollNextLocalTask() { |
1012 |
< |
return ((ForkJoinWorkerThread)(Thread.currentThread())).popTask(); |
1012 |
> |
return ((ForkJoinWorkerThread) Thread.currentThread()) |
1013 |
> |
.pollLocalTask(); |
1014 |
|
} |
1015 |
|
|
1016 |
|
/** |
1017 |
< |
* Unschedules and returns, without executing, the task most |
1018 |
< |
* recently forked by the current thread but not yet executed, if |
1019 |
< |
* one is available, or if not available, a task that was forked |
1020 |
< |
* by some other thread, if available. Availability may be |
1021 |
< |
* transient, so a <code>null</code> result does not necessarily |
1022 |
< |
* imply quiecence of the pool this task is operating in. |
1023 |
< |
* This method is designed primarily to support extensions, |
1024 |
< |
* and is unlikely to be useful otherwise. |
1025 |
< |
* |
1017 |
> |
* Unschedules and returns, without executing, the next task |
1018 |
> |
* queued by the current thread but not yet executed, if one is |
1019 |
> |
* available, or if not available, a task that was forked by some |
1020 |
> |
* other thread, if available. Availability may be transient, so a |
1021 |
> |
* {@code null} result does not necessarily imply quiescence |
1022 |
> |
* of the pool this task is operating in. This method is designed |
1023 |
> |
* primarily to support extensions, and is unlikely to be useful |
1024 |
> |
* otherwise. This method may be invoked only from within |
1025 |
> |
* ForkJoinTask computations (as may be determined using method |
1026 |
> |
* {@link #inForkJoinPool}). Attempts to invoke in other contexts |
1027 |
> |
* result in exceptions or errors, possibly including |
1028 |
> |
* ClassCastException. |
1029 |
> |
* |
1030 |
|
* @return a task, or null if none are available |
1031 |
|
*/ |
1032 |
|
protected static ForkJoinTask<?> pollTask() { |
1033 |
< |
return ((ForkJoinWorkerThread)(Thread.currentThread())). |
1034 |
< |
pollLocalOrStolenTask(); |
1033 |
> |
return ((ForkJoinWorkerThread) Thread.currentThread()) |
1034 |
> |
.pollTask(); |
1035 |
|
} |
1036 |
|
|
1037 |
|
// Serialization support |
1042 |
|
* Save the state to a stream. |
1043 |
|
* |
1044 |
|
* @serialData the current run status and the exception thrown |
1045 |
< |
* during execution, or null if none. |
1045 |
> |
* during execution, or null if none |
1046 |
|
* @param s the stream |
1047 |
|
*/ |
1048 |
|
private void writeObject(java.io.ObjectOutputStream s) |
1053 |
|
|
1054 |
|
/** |
1055 |
|
* Reconstitute the instance from a stream. |
1056 |
+ |
* |
1057 |
|
* @param s the stream |
1058 |
|
*/ |
1059 |
|
private void readObject(java.io.ObjectInputStream s) |
1063 |
|
status |= EXTERNAL_SIGNAL; // conservatively set external signal |
1064 |
|
Object ex = s.readObject(); |
1065 |
|
if (ex != null) |
1066 |
< |
setDoneExceptionally((Throwable)ex); |
1066 |
> |
setDoneExceptionally((Throwable) ex); |
1067 |
|
} |
1068 |
|
|
1069 |
< |
// Temporary Unsafe mechanics for preliminary release |
1069 |
> |
// Unsafe mechanics for jsr166y 3rd party package. |
1070 |
> |
private static sun.misc.Unsafe getUnsafe() { |
1071 |
> |
try { |
1072 |
> |
return sun.misc.Unsafe.getUnsafe(); |
1073 |
> |
} catch (SecurityException se) { |
1074 |
> |
try { |
1075 |
> |
return java.security.AccessController.doPrivileged |
1076 |
> |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
1077 |
> |
public sun.misc.Unsafe run() throws Exception { |
1078 |
> |
return getUnsafeByReflection(); |
1079 |
> |
}}); |
1080 |
> |
} catch (java.security.PrivilegedActionException e) { |
1081 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
1082 |
> |
e.getCause()); |
1083 |
> |
} |
1084 |
> |
} |
1085 |
> |
} |
1086 |
|
|
1087 |
< |
static final Unsafe _unsafe; |
1088 |
< |
static final long statusOffset; |
1087 |
> |
private static sun.misc.Unsafe getUnsafeByReflection() |
1088 |
> |
throws NoSuchFieldException, IllegalAccessException { |
1089 |
> |
java.lang.reflect.Field f = |
1090 |
> |
sun.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
1091 |
> |
f.setAccessible(true); |
1092 |
> |
return (sun.misc.Unsafe) f.get(null); |
1093 |
> |
} |
1094 |
|
|
1095 |
< |
static { |
1095 |
> |
private static long fieldOffset(String fieldName, Class<?> klazz) { |
1096 |
|
try { |
1097 |
< |
if (ForkJoinTask.class.getClassLoader() != null) { |
1098 |
< |
Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
1099 |
< |
f.setAccessible(true); |
1100 |
< |
_unsafe = (Unsafe)f.get(null); |
1101 |
< |
} |
1102 |
< |
else |
1103 |
< |
_unsafe = Unsafe.getUnsafe(); |
1016 |
< |
statusOffset = _unsafe.objectFieldOffset |
1017 |
< |
(ForkJoinTask.class.getDeclaredField("status")); |
1018 |
< |
} catch (Exception ex) { throw new Error(ex); } |
1097 |
> |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(fieldName)); |
1098 |
> |
} catch (NoSuchFieldException e) { |
1099 |
> |
// Convert Exception to Error |
1100 |
> |
NoSuchFieldError error = new NoSuchFieldError(fieldName); |
1101 |
> |
error.initCause(e); |
1102 |
> |
throw error; |
1103 |
> |
} |
1104 |
|
} |
1105 |
|
|
1106 |
+ |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
1107 |
+ |
static final long statusOffset = |
1108 |
+ |
fieldOffset("status", ForkJoinTask.class); |
1109 |
+ |
|
1110 |
|
} |