| 25 |
|
* which differs from both the primitive double {@code ==} operator |
| 26 |
|
* and from {@link Double#equals}, as if implemented by: |
| 27 |
|
* <pre> {@code |
| 28 |
< |
* boolean bitEquals(double x, double y) { |
| 28 |
> |
* static boolean bitEquals(double x, double y) { |
| 29 |
|
* long xBits = Double.doubleToRawLongBits(x); |
| 30 |
|
* long yBits = Double.doubleToRawLongBits(y); |
| 31 |
|
* return xBits == yBits; |
| 32 |
|
* }}</pre> |
| 33 |
|
* |
| 34 |
+ |
* @see jsr166e.DoubleAdder |
| 35 |
+ |
* @see jsr166e.DoubleMaxUpdater |
| 36 |
+ |
* |
| 37 |
|
* @author Doug Lea |
| 38 |
|
* @author Martin Buchholz |
| 39 |
|
*/ |
| 40 |
|
public class AtomicDouble extends Number implements java.io.Serializable { |
| 41 |
< |
static final long serialVersionUID = -8405198993435143622L; |
| 41 |
> |
private static final long serialVersionUID = -8405198993435143622L; |
| 42 |
|
|
| 43 |
< |
private volatile long value; |
| 43 |
> |
private transient volatile long value; |
| 44 |
|
|
| 45 |
|
/** |
| 46 |
< |
* Creates a new AtomicDouble with the given initial value. |
| 46 |
> |
* Creates a new {@code AtomicDouble} with the given initial value. |
| 47 |
|
* |
| 48 |
|
* @param initialValue the initial value |
| 49 |
|
*/ |
| 52 |
|
} |
| 53 |
|
|
| 54 |
|
/** |
| 55 |
< |
* Creates a new AtomicDouble with initial value {@code 0.0}. |
| 55 |
> |
* Creates a new {@code AtomicDouble} with initial value {@code 0.0}. |
| 56 |
|
*/ |
| 57 |
< |
public AtomicDouble() { this(0.0); } |
| 57 |
> |
public AtomicDouble() { |
| 58 |
> |
// assert doubleToRawLongBits(0.0) == 0L; |
| 59 |
> |
} |
| 60 |
|
|
| 61 |
|
/** |
| 62 |
|
* Gets the current value. |
| 123 |
|
* if the current value is <a href="#bitEquals">bitwise equal</a> |
| 124 |
|
* to the expected value. |
| 125 |
|
* |
| 126 |
< |
* <p>May <a href="package-summary.html#Spurious">fail spuriously</a> |
| 126 |
> |
* <p>May <a |
| 127 |
> |
* href="http://download.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/package-summary.html#Spurious"> |
| 128 |
> |
* fail spuriously</a> |
| 129 |
|
* and does not provide ordering guarantees, so is only rarely an |
| 130 |
|
* appropriate alternative to {@code compareAndSet}. |
| 131 |
|
* |
| 184 |
|
* after a narrowing primitive conversion. |
| 185 |
|
*/ |
| 186 |
|
public int intValue() { |
| 187 |
< |
return (int)get(); |
| 187 |
> |
return (int) get(); |
| 188 |
|
} |
| 189 |
|
|
| 190 |
|
/** |
| 192 |
|
* after a narrowing primitive conversion. |
| 193 |
|
*/ |
| 194 |
|
public long longValue() { |
| 195 |
< |
return (long)get(); |
| 195 |
> |
return (long) get(); |
| 196 |
|
} |
| 197 |
|
|
| 198 |
|
/** |
| 200 |
|
* after a narrowing primitive conversion. |
| 201 |
|
*/ |
| 202 |
|
public float floatValue() { |
| 203 |
< |
return (float)get(); |
| 203 |
> |
return (float) get(); |
| 204 |
|
} |
| 205 |
|
|
| 206 |
|
/** |
| 210 |
|
return get(); |
| 211 |
|
} |
| 212 |
|
|
| 213 |
+ |
/** |
| 214 |
+ |
* Saves the state to a stream (that is, serializes it). |
| 215 |
+ |
* |
| 216 |
+ |
* @serialData The current value is emitted (a {@code double}). |
| 217 |
+ |
*/ |
| 218 |
+ |
private void writeObject(java.io.ObjectOutputStream s) |
| 219 |
+ |
throws java.io.IOException { |
| 220 |
+ |
s.defaultWriteObject(); |
| 221 |
+ |
|
| 222 |
+ |
s.writeDouble(get()); |
| 223 |
+ |
} |
| 224 |
+ |
|
| 225 |
+ |
/** |
| 226 |
+ |
* Reconstitutes the instance from a stream (that is, deserializes it). |
| 227 |
+ |
*/ |
| 228 |
+ |
private void readObject(java.io.ObjectInputStream s) |
| 229 |
+ |
throws java.io.IOException, ClassNotFoundException { |
| 230 |
+ |
s.defaultReadObject(); |
| 231 |
+ |
|
| 232 |
+ |
set(s.readDouble()); |
| 233 |
+ |
} |
| 234 |
+ |
|
| 235 |
|
// Unsafe mechanics |
| 236 |
|
private static final sun.misc.Unsafe unsafe = getUnsafe(); |
| 237 |
|
private static final long valueOffset; |
| 253 |
|
private static sun.misc.Unsafe getUnsafe() { |
| 254 |
|
try { |
| 255 |
|
return sun.misc.Unsafe.getUnsafe(); |
| 256 |
< |
} catch (SecurityException se) { |
| 257 |
< |
try { |
| 258 |
< |
return java.security.AccessController.doPrivileged |
| 259 |
< |
(new java.security |
| 260 |
< |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 261 |
< |
public sun.misc.Unsafe run() throws Exception { |
| 262 |
< |
java.lang.reflect.Field f = sun.misc |
| 263 |
< |
.Unsafe.class.getDeclaredField("theUnsafe"); |
| 264 |
< |
f.setAccessible(true); |
| 265 |
< |
return (sun.misc.Unsafe) f.get(null); |
| 266 |
< |
}}); |
| 267 |
< |
} catch (java.security.PrivilegedActionException e) { |
| 268 |
< |
throw new RuntimeException("Could not initialize intrinsics", |
| 269 |
< |
e.getCause()); |
| 270 |
< |
} |
| 256 |
> |
} catch (SecurityException tryReflectionInstead) {} |
| 257 |
> |
try { |
| 258 |
> |
return java.security.AccessController.doPrivileged |
| 259 |
> |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 260 |
> |
public sun.misc.Unsafe run() throws Exception { |
| 261 |
> |
Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class; |
| 262 |
> |
for (java.lang.reflect.Field f : k.getDeclaredFields()) { |
| 263 |
> |
f.setAccessible(true); |
| 264 |
> |
Object x = f.get(null); |
| 265 |
> |
if (k.isInstance(x)) |
| 266 |
> |
return k.cast(x); |
| 267 |
> |
} |
| 268 |
> |
throw new NoSuchFieldError("the Unsafe"); |
| 269 |
> |
}}); |
| 270 |
> |
} catch (java.security.PrivilegedActionException e) { |
| 271 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
| 272 |
> |
e.getCause()); |
| 273 |
|
} |
| 274 |
|
} |
| 244 |
– |
|
| 275 |
|
} |
