| 19 |
|
* this class does extend {@code Number} to allow uniform access by |
| 20 |
|
* tools and utilities that deal with numerically-based classes. |
| 21 |
|
* |
| 22 |
< |
* <p><a name="bitEquals">This class compares primitive {@code double} |
| 22 |
> |
* <p id="bitEquals">This class compares primitive {@code double} |
| 23 |
|
* values in methods such as {@link #compareAndSet} by comparing their |
| 24 |
|
* bitwise representation using {@link Double#doubleToRawLongBits}, |
| 25 |
|
* which differs from both the primitive double {@code ==} operator |
| 123 |
|
* if the current value is <a href="#bitEquals">bitwise equal</a> |
| 124 |
|
* to the expected value. |
| 125 |
|
* |
| 126 |
< |
* <p>May <a |
| 126 |
> |
* <p><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}. |
| 128 |
> |
|
| 129 |
> |
* May fail spuriously and does not provide ordering guarantees</a>, |
| 130 |
> |
* so is only rarely an appropriate alternative to {@code compareAndSet}. |
| 131 |
|
* |
| 132 |
|
* @param expect the expected value |
| 133 |
|
* @param update the new value |
| 216 |
|
* @serialData The current value is emitted (a {@code double}). |
| 217 |
|
*/ |
| 218 |
|
private void writeObject(java.io.ObjectOutputStream s) |
| 219 |
< |
throws java.io.IOException{ |
| 219 |
> |
throws java.io.IOException { |
| 220 |
|
s.defaultWriteObject(); |
| 221 |
|
|
| 222 |
|
s.writeDouble(get()); |
| 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 |
|
} |
| 275 |
|
} |
