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src/java.base/share/classes/java/util/concurrent/atomic/AtomicMarkableReference.java

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8197531: Miscellaneous changes imported from jsr166 CVS 2018-04
Reviewed-by: martin, psandoz


 182      * @param expectedReference the expected value of the reference
 183      * @param newMark the new value for the mark
 184      * @return {@code true} if successful
 185      */
 186     public boolean attemptMark(V expectedReference, boolean newMark) {
 187         Pair<V> current = pair;
 188         return
 189             expectedReference == current.reference &&
 190             (newMark == current.mark ||
 191              casPair(current, Pair.of(expectedReference, newMark)));
 192     }
 193 
 194     // VarHandle mechanics
 195     private static final VarHandle PAIR;
 196     static {
 197         try {
 198             MethodHandles.Lookup l = MethodHandles.lookup();
 199             PAIR = l.findVarHandle(AtomicMarkableReference.class, "pair",
 200                                    Pair.class);
 201         } catch (ReflectiveOperationException e) {
 202             throw new Error(e);
 203         }
 204     }
 205 
 206     private boolean casPair(Pair<V> cmp, Pair<V> val) {
 207         return PAIR.compareAndSet(this, cmp, val);
 208     }
 209 }



 182      * @param expectedReference the expected value of the reference
 183      * @param newMark the new value for the mark
 184      * @return {@code true} if successful
 185      */
 186     public boolean attemptMark(V expectedReference, boolean newMark) {
 187         Pair<V> current = pair;
 188         return
 189             expectedReference == current.reference &&
 190             (newMark == current.mark ||
 191              casPair(current, Pair.of(expectedReference, newMark)));
 192     }
 193 
 194     // VarHandle mechanics
 195     private static final VarHandle PAIR;
 196     static {
 197         try {
 198             MethodHandles.Lookup l = MethodHandles.lookup();
 199             PAIR = l.findVarHandle(AtomicMarkableReference.class, "pair",
 200                                    Pair.class);
 201         } catch (ReflectiveOperationException e) {
 202             throw new ExceptionInInitializerError(e);
 203         }
 204     }
 205 
 206     private boolean casPair(Pair<V> cmp, Pair<V> val) {
 207         return PAIR.compareAndSet(this, cmp, val);
 208     }
 209 }
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