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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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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 |
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private static final int phaseMask = 0x7fffffff; |
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private static int unarrivedOf(long s) { |
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return (int)(s & ushortMask); |
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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; |
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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. |
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*/ |
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private long getReconciledState() { |
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return parent == null? state : reconcileState(); |
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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 |
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if (casState |
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(s, |
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trippedStateFor(onAdvance(phase, parties)? -1 : |
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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; |
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if (unarrived == 0) { |
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if (casState |
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(s, |
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trippedStateFor(onAdvance(phase, parties)? -1 : |
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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; |
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* @throws InterruptedException if thread interrupted while waiting |
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* @throws TimeoutException if timed out while waiting |
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*/ |
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public int awaitAdvanceInterruptibly(int phase, long timeout, TimeUnit unit) |
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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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} |
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/** |
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* Returns the parent of this phaser, or null if none. |
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* Returns the parent of this phaser, or {@code null} if none. |
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* |
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* @return the parent of this phaser, or null if none |
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* @return the parent of this phaser, or {@code null} if none |
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*/ |
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public Phaser getParent() { |
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return parent; |
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* Overridable method to perform an action upon phase advance, and |
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* to control termination. This method is invoked whenever the |
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* barrier is tripped (and thus all other waiting parties are |
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* dormant). If it returns true, then, rather than advance the |
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* phase number, this barrier will be set to a final termination |
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* state, and subsequent calls to {@code isTerminated} will |
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< |
* return true. |
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* dormant). If it returns {@code true}, then, rather than advance |
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* the phase number, this barrier will be set to a final |
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* termination state, and subsequent calls to {@link #isTerminated} |
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* will return true. |
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* |
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< |
* <p> The default version returns true when the number of |
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> |
* <p> The default version returns {@code true} when the number of |
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* registered parties is zero. Normally, overrides that arrange |
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* termination for other reasons should also preserve this |
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* property. |
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return p; |
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} |
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// Temporary Unsafe mechanics for preliminary release |
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private static Unsafe getUnsafe() throws Throwable { |
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try { |
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return Unsafe.getUnsafe(); |
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} catch (SecurityException se) { |
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try { |
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return java.security.AccessController.doPrivileged |
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(new java.security.PrivilegedExceptionAction<Unsafe>() { |
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public Unsafe run() throws Exception { |
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return getUnsafePrivileged(); |
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}}); |
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< |
} catch (java.security.PrivilegedActionException e) { |
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throw e.getCause(); |
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} |
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} |
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} |
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// Unsafe mechanics |
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private static Unsafe getUnsafePrivileged() |
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throws NoSuchFieldException, IllegalAccessException { |
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< |
Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
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f.setAccessible(true); |
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< |
return (Unsafe) f.get(null); |
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< |
} |
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private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
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> |
private static final long stateOffset = |
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objectFieldOffset("state", Phaser.class); |
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private static long fieldOffset(String fieldName) |
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< |
throws NoSuchFieldException { |
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return UNSAFE.objectFieldOffset |
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(Phaser.class.getDeclaredField(fieldName)); |
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> |
private final boolean casState(long cmp, long val) { |
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return UNSAFE.compareAndSwapLong(this, stateOffset, cmp, val); |
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} |
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|
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< |
static final Unsafe UNSAFE; |
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< |
static final long stateOffset; |
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< |
|
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< |
static { |
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> |
private static long objectFieldOffset(String field, Class<?> klazz) { |
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try { |
| 945 |
< |
UNSAFE = getUnsafe(); |
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stateOffset = fieldOffset("state"); |
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< |
} catch (Throwable e) { |
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< |
throw new RuntimeException("Could not initialize intrinsics", e); |
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> |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(field)); |
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> |
} catch (NoSuchFieldException e) { |
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> |
// Convert Exception to corresponding Error |
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> |
NoSuchFieldError error = new NoSuchFieldError(field); |
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error.initCause(e); |
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> |
throw error; |
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} |
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} |
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|
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< |
final boolean casState(long cmp, long val) { |
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< |
return UNSAFE.compareAndSwapLong(this, stateOffset, cmp, val); |
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> |
/** |
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* Returns a sun.misc.Unsafe. Suitable for use in a 3rd party package. |
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* Replace with a simple call to Unsafe.getUnsafe when integrating |
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> |
* into a jdk. |
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> |
* |
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> |
* @return a sun.misc.Unsafe |
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> |
*/ |
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> |
private static sun.misc.Unsafe getUnsafe() { |
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> |
try { |
| 963 |
> |
return sun.misc.Unsafe.getUnsafe(); |
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> |
} catch (SecurityException se) { |
| 965 |
> |
try { |
| 966 |
> |
return java.security.AccessController.doPrivileged |
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> |
(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"); |
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> |
f.setAccessible(true); |
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> |
return (sun.misc.Unsafe) f.get(null); |
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> |
}}); |
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> |
} catch (java.security.PrivilegedActionException e) { |
| 976 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
| 977 |
> |
e.getCause()); |
| 978 |
> |
} |
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> |
} |
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} |
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} |
