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8225490: Miscellaneous changes imported from jsr166 CVS 2019-09

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Reviewed-by: martin, alanb
This commit is contained in:
Doug Lea 2019-09-14 11:26:26 -07:00
parent 9275097a02
commit eb1eadb69f
46 changed files with 622 additions and 640 deletions
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35
src/java.base/share/classes/java/util/concurrent/ConcurrentHashMap.java
View file

@ -385,7 +385,7 @@ public class ConcurrentHashMap<K,V> extends AbstractMap<K,V>
* cases where old nodes can be reused because their next fields
* won't change. On average, only about one-sixth of them need
* cloning when a table doubles. The nodes they replace will be
* garbage collectable as soon as they are no longer referenced by
* garbage collectible as soon as they are no longer referenced by
* any reader thread that may be in the midst of concurrently
* traversing table. Upon transfer, the old table bin contains
* only a special forwarding node (with hash field "MOVED") that
@ -3286,9 +3286,8 @@ public class ConcurrentHashMap<K,V> extends AbstractMap<K,V>
return true;
}
private static final Unsafe U = Unsafe.getUnsafe();
private static final long LOCKSTATE
= U.objectFieldOffset(TreeBin.class, "lockState");
= U.objectFieldOffset(TreeBin.class, "lockState");
}
/* ----------------Table Traversal -------------- */
@ -6345,28 +6344,20 @@ public class ConcurrentHashMap<K,V> extends AbstractMap<K,V>
// Unsafe mechanics
private static final Unsafe U = Unsafe.getUnsafe();
private static final long SIZECTL;
private static final long TRANSFERINDEX;
private static final long BASECOUNT;
private static final long CELLSBUSY;
private static final long CELLVALUE;
private static final int ABASE;
private static final long SIZECTL
= U.objectFieldOffset(ConcurrentHashMap.class, "sizeCtl");
private static final long TRANSFERINDEX
= U.objectFieldOffset(ConcurrentHashMap.class, "transferIndex");
private static final long BASECOUNT
= U.objectFieldOffset(ConcurrentHashMap.class, "baseCount");
private static final long CELLSBUSY
= U.objectFieldOffset(ConcurrentHashMap.class, "cellsBusy");
private static final long CELLVALUE
= U.objectFieldOffset(CounterCell.class, "value");
private static final int ABASE = U.arrayBaseOffset(Node[].class);
private static final int ASHIFT;
static {
SIZECTL = U.objectFieldOffset
(ConcurrentHashMap.class, "sizeCtl");
TRANSFERINDEX = U.objectFieldOffset
(ConcurrentHashMap.class, "transferIndex");
BASECOUNT = U.objectFieldOffset
(ConcurrentHashMap.class, "baseCount");
CELLSBUSY = U.objectFieldOffset
(ConcurrentHashMap.class, "cellsBusy");
CELLVALUE = U.objectFieldOffset
(CounterCell.class, "value");
ABASE = U.arrayBaseOffset(Node[].class);
int scale = U.arrayIndexScale(Node[].class);
if ((scale & (scale - 1)) != 0)
throw new ExceptionInInitializerError("array index scale not a power of two");

2
src/java.base/share/classes/java/util/concurrent/Phaser.java
View file

@ -97,7 +97,7 @@ import java.util.concurrent.locks.LockSupport;
* associated recovery within handlers of those exceptions,
* often after invoking {@code forceTermination}. Phasers may
* also be used by tasks executing in a {@link ForkJoinPool}.
* Progress is ensured if the pool's parallelismLevel can
* Progress is ensured if the pool's parallelism level can
* accommodate the maximum number of simultaneously blocked
* parties.
*

24
src/java.base/share/classes/java/util/concurrent/ThreadLocalRandom.java
View file

@ -1053,18 +1053,18 @@ public class ThreadLocalRandom extends Random {
// Unsafe mechanics
private static final Unsafe U = Unsafe.getUnsafe();
private static final long SEED = U.objectFieldOffset
(Thread.class, "threadLocalRandomSeed");
private static final long PROBE = U.objectFieldOffset
(Thread.class, "threadLocalRandomProbe");
private static final long SECONDARY = U.objectFieldOffset
(Thread.class, "threadLocalRandomSecondarySeed");
private static final long THREADLOCALS = U.objectFieldOffset
(Thread.class, "threadLocals");
private static final long INHERITABLETHREADLOCALS = U.objectFieldOffset
(Thread.class, "inheritableThreadLocals");
private static final long INHERITEDACCESSCONTROLCONTEXT = U.objectFieldOffset
(Thread.class, "inheritedAccessControlContext");
private static final long SEED
= U.objectFieldOffset(Thread.class, "threadLocalRandomSeed");
private static final long PROBE
= U.objectFieldOffset(Thread.class, "threadLocalRandomProbe");
private static final long SECONDARY
= U.objectFieldOffset(Thread.class, "threadLocalRandomSecondarySeed");
private static final long THREADLOCALS
= U.objectFieldOffset(Thread.class, "threadLocals");
private static final long INHERITABLETHREADLOCALS
= U.objectFieldOffset(Thread.class, "inheritableThreadLocals");
private static final long INHERITEDACCESSCONTROLCONTEXT
= U.objectFieldOffset(Thread.class, "inheritedAccessControlContext");
/** Rarely-used holder for the second of a pair of Gaussians */
private static final ThreadLocal<Double> nextLocalGaussian =

6
src/java.base/share/classes/java/util/concurrent/atomic/AtomicInteger.java
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@ -38,6 +38,7 @@ package java.util.concurrent.atomic;
import java.lang.invoke.VarHandle;
import java.util.function.IntBinaryOperator;
import java.util.function.IntUnaryOperator;
import jdk.internal.misc.Unsafe;
/**
* An {@code int} value that may be updated atomically. See the
@ -58,8 +59,9 @@ public class AtomicInteger extends Number implements java.io.Serializable {
* This class intended to be implemented using VarHandles, but there
* are unresolved cyclic startup dependencies.
*/
private static final jdk.internal.misc.Unsafe U = jdk.internal.misc.Unsafe.getUnsafe();
private static final long VALUE = U.objectFieldOffset(AtomicInteger.class, "value");
private static final Unsafe U = Unsafe.getUnsafe();
private static final long VALUE
= U.objectFieldOffset(AtomicInteger.class, "value");
private volatile int value;

6
src/java.base/share/classes/java/util/concurrent/atomic/AtomicLong.java
View file

@ -38,6 +38,7 @@ package java.util.concurrent.atomic;
import java.lang.invoke.VarHandle;
import java.util.function.LongBinaryOperator;
import java.util.function.LongUnaryOperator;
import jdk.internal.misc.Unsafe;
/**
* A {@code long} value that may be updated atomically. See the
@ -72,8 +73,9 @@ public class AtomicLong extends Number implements java.io.Serializable {
* This class intended to be implemented using VarHandles, but there
* are unresolved cyclic startup dependencies.
*/
private static final jdk.internal.misc.Unsafe U = jdk.internal.misc.Unsafe.getUnsafe();
private static final long VALUE = U.objectFieldOffset(AtomicLong.class, "value");
private static final Unsafe U = Unsafe.getUnsafe();
private static final long VALUE
= U.objectFieldOffset(AtomicLong.class, "value");
private volatile long value;

5
src/java.base/share/classes/java/util/concurrent/package-info.java
View file

@ -226,9 +226,8 @@
*
* <h2 id="MemoryVisibility">Memory Consistency Properties</h2>
*
* <a href="https://docs.oracle.com/javase/specs/jls/se11/html/jls-17.html#jls-17.4.5">
* Chapter 17 of
* <cite>The Java&trade; Language Specification</cite></a> defines the
* <cite>The Java&trade; Language Specification</cite> defines the
* <i>happens-before</i> relation on memory operations such as reads and
* writes of shared variables. The results of a write by one thread are
* guaranteed to be visible to a read by another thread only if the write
@ -302,6 +301,8 @@
*
* </ul>
*
* @jls 17.4.5 Happens-before Order
*
* @since 1.5
*/
package java.util.concurrent;