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package jsr166y; |
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import java.util.concurrent.*; |
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import java.util.concurrent.atomic.*; |
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11 |
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import java.util.concurrent.atomic.AtomicReference; |
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import java.util.concurrent.locks.LockSupport; |
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import sun.misc.Unsafe; |
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import java.lang.reflect.*; |
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/** |
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* A reusable synchronization barrier, similar in functionality to a |
210 |
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private static final int phaseMask = 0x7fffffff; |
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private static int unarrivedOf(long s) { |
213 |
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return (int)(s & ushortMask); |
213 |
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return (int) (s & ushortMask); |
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} |
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private static int partiesOf(long s) { |
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private final AtomicReference<QNode> oddQ = new AtomicReference<QNode>(); |
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private AtomicReference<QNode> queueFor(int phase) { |
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return (phase & 1) == 0? evenQ : oddQ; |
268 |
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return ((phase & 1) == 0) ? evenQ : oddQ; |
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} |
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/** |
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* root if necessary. |
274 |
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*/ |
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private long getReconciledState() { |
276 |
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return parent == null? state : reconcileState(); |
276 |
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return (parent == null) ? state : reconcileState(); |
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} |
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/** |
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if (par == null) { // directly trip |
441 |
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if (casState |
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(s, |
443 |
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trippedStateFor(onAdvance(phase, parties)? -1 : |
443 |
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trippedStateFor(onAdvance(phase, parties) ? -1 : |
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((phase + 1) & phaseMask), parties))) { |
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releaseWaiters(phase); |
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break; |
501 |
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if (unarrived == 0) { |
502 |
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if (casState |
503 |
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(s, |
504 |
< |
trippedStateFor(onAdvance(phase, parties)? -1 : |
504 |
> |
trippedStateFor(onAdvance(phase, parties) ? -1 : |
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((phase + 1) & phaseMask), parties))) { |
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releaseWaiters(phase); |
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break; |
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* @throws InterruptedException if thread interrupted while waiting |
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* @throws TimeoutException if timed out while waiting |
588 |
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*/ |
589 |
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public int awaitAdvanceInterruptibly(int phase, long timeout, TimeUnit unit) |
589 |
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public int awaitAdvanceInterruptibly(int phase, |
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long timeout, TimeUnit unit) |
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throws InterruptedException, TimeoutException { |
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if (phase < 0) |
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return phase; |
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return p; |
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} |
932 |
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|
933 |
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// Temporary Unsafe mechanics for preliminary release |
934 |
< |
private static Unsafe getUnsafe() throws Throwable { |
935 |
< |
try { |
936 |
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return Unsafe.getUnsafe(); |
937 |
< |
} catch (SecurityException se) { |
938 |
< |
try { |
939 |
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return java.security.AccessController.doPrivileged |
940 |
< |
(new java.security.PrivilegedExceptionAction<Unsafe>() { |
941 |
< |
public Unsafe run() throws Exception { |
942 |
< |
return getUnsafePrivileged(); |
943 |
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}}); |
944 |
< |
} catch (java.security.PrivilegedActionException e) { |
945 |
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throw e.getCause(); |
946 |
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} |
947 |
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} |
948 |
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} |
933 |
> |
// Unsafe mechanics |
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|
935 |
< |
private static Unsafe getUnsafePrivileged() |
936 |
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throws NoSuchFieldException, IllegalAccessException { |
937 |
< |
Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
953 |
< |
f.setAccessible(true); |
954 |
< |
return (Unsafe) f.get(null); |
955 |
< |
} |
935 |
> |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
936 |
> |
private static final long stateOffset = |
937 |
> |
objectFieldOffset("state", Phaser.class); |
938 |
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|
939 |
< |
private static long fieldOffset(String fieldName) |
940 |
< |
throws NoSuchFieldException { |
959 |
< |
return UNSAFE.objectFieldOffset |
960 |
< |
(Phaser.class.getDeclaredField(fieldName)); |
939 |
> |
private final boolean casState(long cmp, long val) { |
940 |
> |
return UNSAFE.compareAndSwapLong(this, stateOffset, cmp, val); |
941 |
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} |
942 |
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|
943 |
< |
static final Unsafe UNSAFE; |
964 |
< |
static final long stateOffset; |
965 |
< |
|
966 |
< |
static { |
943 |
> |
private static long objectFieldOffset(String field, Class<?> klazz) { |
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try { |
945 |
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UNSAFE = getUnsafe(); |
946 |
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stateOffset = fieldOffset("state"); |
947 |
< |
} catch (Throwable e) { |
948 |
< |
throw new RuntimeException("Could not initialize intrinsics", e); |
945 |
> |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field)); |
946 |
> |
} catch (NoSuchFieldException e) { |
947 |
> |
// Convert Exception to corresponding Error |
948 |
> |
NoSuchFieldError error = new NoSuchFieldError(field); |
949 |
> |
error.initCause(e); |
950 |
> |
throw error; |
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} |
952 |
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} |
953 |
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|
954 |
< |
final boolean casState(long cmp, long val) { |
955 |
< |
return UNSAFE.compareAndSwapLong(this, stateOffset, cmp, val); |
954 |
> |
/** |
955 |
> |
* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
956 |
> |
* Replace with a simple call to Unsafe.getUnsafe when integrating |
957 |
> |
* into a jdk. |
958 |
> |
* |
959 |
> |
* @return a sun.misc.Unsafe |
960 |
> |
*/ |
961 |
> |
private static sun.misc.Unsafe getUnsafe() { |
962 |
> |
try { |
963 |
> |
return sun.misc.Unsafe.getUnsafe(); |
964 |
> |
} catch (SecurityException se) { |
965 |
> |
try { |
966 |
> |
return java.security.AccessController.doPrivileged |
967 |
> |
(new java.security |
968 |
> |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
969 |
> |
public sun.misc.Unsafe run() throws Exception { |
970 |
> |
java.lang.reflect.Field f = sun.misc |
971 |
> |
.Unsafe.class.getDeclaredField("theUnsafe"); |
972 |
> |
f.setAccessible(true); |
973 |
> |
return (sun.misc.Unsafe) f.get(null); |
974 |
> |
}}); |
975 |
> |
} catch (java.security.PrivilegedActionException e) { |
976 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
977 |
> |
e.getCause()); |
978 |
> |
} |
979 |
> |
} |
980 |
|
} |
981 |
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} |