| 5 |
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*/ |
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|
|
| 7 |
|
package jsr166y; |
| 8 |
< |
import java.io.Serializable; |
| 9 |
< |
import java.util.*; |
| 8 |
> |
|
| 9 |
|
import java.util.concurrent.*; |
| 10 |
< |
import java.util.concurrent.atomic.*; |
| 11 |
< |
import sun.misc.Unsafe; |
| 12 |
< |
import java.lang.reflect.*; |
| 10 |
> |
|
| 11 |
> |
import java.io.Serializable; |
| 12 |
> |
import java.util.Collection; |
| 13 |
> |
import java.util.Collections; |
| 14 |
> |
import java.util.List; |
| 15 |
> |
import java.util.Map; |
| 16 |
> |
import java.util.WeakHashMap; |
| 17 |
|
|
| 18 |
|
/** |
| 19 |
|
* Abstract base class for tasks that run within a {@link |
| 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 |
+ |
* @return {@code this}, to simplify usage. |
| 497 |
|
*/ |
| 498 |
< |
public final void fork() { |
| 498 |
> |
public final ForkJoinTask<V> fork() { |
| 499 |
|
((ForkJoinWorkerThread) Thread.currentThread()) |
| 500 |
|
.pushTask(this); |
| 501 |
+ |
return this; |
| 502 |
|
} |
| 503 |
|
|
| 504 |
|
/** |
| 606 |
|
* in exceptions or errors, possibly including ClassCastException. |
| 607 |
|
* |
| 608 |
|
* @param tasks the collection of tasks |
| 609 |
+ |
* @return the tasks argument, to simplify usage |
| 610 |
|
* @throws NullPointerException if tasks or any element are null |
| 611 |
|
* @throws RuntimeException or Error if any task did so |
| 612 |
|
*/ |
| 613 |
< |
public static void invokeAll(Collection<? extends ForkJoinTask<?>> tasks) { |
| 613 |
> |
public static <T extends ForkJoinTask<?>> Collection<T> invokeAll(Collection<T> tasks) { |
| 614 |
|
if (!(tasks instanceof List<?>)) { |
| 615 |
|
invokeAll(tasks.toArray(new ForkJoinTask<?>[tasks.size()])); |
| 616 |
< |
return; |
| 616 |
> |
return tasks; |
| 617 |
|
} |
| 618 |
|
@SuppressWarnings("unchecked") |
| 619 |
|
List<? extends ForkJoinTask<?>> ts = |
| 648 |
|
} |
| 649 |
|
if (ex != null) |
| 650 |
|
rethrowException(ex); |
| 651 |
+ |
return tasks; |
| 652 |
|
} |
| 653 |
|
|
| 654 |
|
/** |
| 1039 |
|
.pollTask(); |
| 1040 |
|
} |
| 1041 |
|
|
| 1042 |
+ |
// adaptors |
| 1043 |
+ |
|
| 1044 |
+ |
/** |
| 1045 |
+ |
* Returns a new ForkJoinTask that performs the {@code run} |
| 1046 |
+ |
* method of the given Runnable as its action, and returns a null |
| 1047 |
+ |
* result upon {@code join}. |
| 1048 |
+ |
* |
| 1049 |
+ |
* @param runnable the runnable action |
| 1050 |
+ |
* @return the task |
| 1051 |
+ |
*/ |
| 1052 |
+ |
public static ForkJoinTask<Void> adapt(Runnable runnable) { |
| 1053 |
+ |
return new ForkJoinPool.AdaptedRunnable<Void>(runnable, null); |
| 1054 |
+ |
} |
| 1055 |
+ |
|
| 1056 |
+ |
/** |
| 1057 |
+ |
* Returns a new ForkJoinTask that performs the {@code run} |
| 1058 |
+ |
* method of the given Runnable as its action, and returns the |
| 1059 |
+ |
* given result upon {@code join}. |
| 1060 |
+ |
* |
| 1061 |
+ |
* @param runnable the runnable action |
| 1062 |
+ |
* @param result the result upon completion |
| 1063 |
+ |
* @return the task |
| 1064 |
+ |
*/ |
| 1065 |
+ |
public static <T> ForkJoinTask<T> adapt(Runnable runnable, T result) { |
| 1066 |
+ |
return new ForkJoinPool.AdaptedRunnable<T>(runnable, result); |
| 1067 |
+ |
} |
| 1068 |
+ |
|
| 1069 |
+ |
/** |
| 1070 |
+ |
* Returns a new ForkJoinTask that performs the {@code call} |
| 1071 |
+ |
* method of the given Callable as its action, and returns its |
| 1072 |
+ |
* result upon {@code join}, translating any checked |
| 1073 |
+ |
* exceptions encountered into {@code RuntimeException}. |
| 1074 |
+ |
* |
| 1075 |
+ |
* @param callable the callable action |
| 1076 |
+ |
* @return the task |
| 1077 |
+ |
*/ |
| 1078 |
+ |
public static <T> ForkJoinTask<T> adapt(Callable<T> callable) { |
| 1079 |
+ |
return new ForkJoinPool.AdaptedCallable<T>(callable); |
| 1080 |
+ |
} |
| 1081 |
+ |
|
| 1082 |
|
// Serialization support |
| 1083 |
|
|
| 1084 |
|
private static final long serialVersionUID = -7721805057305804111L; |
| 1111 |
|
setDoneExceptionally((Throwable) ex); |
| 1112 |
|
} |
| 1113 |
|
|
| 1114 |
< |
// Temporary Unsafe mechanics for preliminary release |
| 1115 |
< |
private static Unsafe getUnsafe() throws Throwable { |
| 1114 |
> |
// Unsafe mechanics |
| 1115 |
> |
|
| 1116 |
> |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
| 1117 |
> |
private static final long statusOffset = |
| 1118 |
> |
objectFieldOffset("status", ForkJoinTask.class); |
| 1119 |
> |
|
| 1120 |
> |
private static long objectFieldOffset(String field, Class<?> klazz) { |
| 1121 |
> |
try { |
| 1122 |
> |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field)); |
| 1123 |
> |
} catch (NoSuchFieldException e) { |
| 1124 |
> |
// Convert Exception to corresponding Error |
| 1125 |
> |
NoSuchFieldError error = new NoSuchFieldError(field); |
| 1126 |
> |
error.initCause(e); |
| 1127 |
> |
throw error; |
| 1128 |
> |
} |
| 1129 |
> |
} |
| 1130 |
> |
|
| 1131 |
> |
/** |
| 1132 |
> |
* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
| 1133 |
> |
* Replace with a simple call to Unsafe.getUnsafe when integrating |
| 1134 |
> |
* into a jdk. |
| 1135 |
> |
* |
| 1136 |
> |
* @return a sun.misc.Unsafe |
| 1137 |
> |
*/ |
| 1138 |
> |
private static sun.misc.Unsafe getUnsafe() { |
| 1139 |
|
try { |
| 1140 |
< |
return Unsafe.getUnsafe(); |
| 1140 |
> |
return sun.misc.Unsafe.getUnsafe(); |
| 1141 |
|
} catch (SecurityException se) { |
| 1142 |
|
try { |
| 1143 |
|
return java.security.AccessController.doPrivileged |
| 1144 |
< |
(new java.security.PrivilegedExceptionAction<Unsafe>() { |
| 1145 |
< |
public Unsafe run() throws Exception { |
| 1146 |
< |
return getUnsafePrivileged(); |
| 1144 |
> |
(new java.security |
| 1145 |
> |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 1146 |
> |
public sun.misc.Unsafe run() throws Exception { |
| 1147 |
> |
java.lang.reflect.Field f = sun.misc |
| 1148 |
> |
.Unsafe.class.getDeclaredField("theUnsafe"); |
| 1149 |
> |
f.setAccessible(true); |
| 1150 |
> |
return (sun.misc.Unsafe) f.get(null); |
| 1151 |
|
}}); |
| 1152 |
|
} catch (java.security.PrivilegedActionException e) { |
| 1153 |
< |
throw e.getCause(); |
| 1153 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
| 1154 |
> |
e.getCause()); |
| 1155 |
|
} |
| 1156 |
|
} |
| 1157 |
|
} |
| 1082 |
– |
|
| 1083 |
– |
private static Unsafe getUnsafePrivileged() |
| 1084 |
– |
throws NoSuchFieldException, IllegalAccessException { |
| 1085 |
– |
Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
| 1086 |
– |
f.setAccessible(true); |
| 1087 |
– |
return (Unsafe) f.get(null); |
| 1088 |
– |
} |
| 1089 |
– |
|
| 1090 |
– |
private static long fieldOffset(String fieldName) |
| 1091 |
– |
throws NoSuchFieldException { |
| 1092 |
– |
return UNSAFE.objectFieldOffset |
| 1093 |
– |
(ForkJoinTask.class.getDeclaredField(fieldName)); |
| 1094 |
– |
} |
| 1095 |
– |
|
| 1096 |
– |
static final Unsafe UNSAFE; |
| 1097 |
– |
static final long statusOffset; |
| 1098 |
– |
|
| 1099 |
– |
static { |
| 1100 |
– |
try { |
| 1101 |
– |
UNSAFE = getUnsafe(); |
| 1102 |
– |
statusOffset = fieldOffset("status"); |
| 1103 |
– |
} catch (Throwable e) { |
| 1104 |
– |
throw new RuntimeException("Could not initialize intrinsics", e); |
| 1105 |
– |
} |
| 1106 |
– |
} |
| 1107 |
– |
|
| 1158 |
|
} |
