| 14 |
|
* See the {@link java.util.concurrent.atomic} package specification |
| 15 |
|
* for description of the properties of atomic variables. |
| 16 |
|
* |
| 17 |
< |
* <p><a name="bitEquals">This class compares primitive {@code double} |
| 17 |
> |
* <p id="bitEquals">This class compares primitive {@code double} |
| 18 |
|
* values in methods such as {@link #compareAndSet} by comparing their |
| 19 |
|
* bitwise representation using {@link Double#doubleToRawLongBits}, |
| 20 |
|
* which differs from both the primitive double {@code ==} operator |
| 162 |
|
* if the current value is <a href="#bitEquals">bitwise equal</a> |
| 163 |
|
* to the expected value. |
| 164 |
|
* |
| 165 |
< |
* <p>May <a |
| 165 |
> |
* <p><a |
| 166 |
|
* href="http://download.oracle.com/javase/7/docs/api/java/util/concurrent/atomic/package-summary.html#Spurious"> |
| 167 |
< |
* fail spuriously</a> |
| 168 |
< |
* and does not provide ordering guarantees, so is only rarely an |
| 169 |
< |
* appropriate alternative to {@code compareAndSet}. |
| 167 |
> |
* May fail spuriously and does not provide ordering guarantees</a>, |
| 168 |
> |
* so is only rarely an appropriate alternative to {@code compareAndSet}. |
| 169 |
|
* |
| 170 |
|
* @param i the index |
| 171 |
|
* @param expect the expected value |
| 237 |
|
/** |
| 238 |
|
* Saves the state to a stream (that is, serializes it). |
| 239 |
|
* |
| 240 |
+ |
* @param s the stream |
| 241 |
+ |
* @throws java.io.IOException if an I/O error occurs |
| 242 |
|
* @serialData The length of the array is emitted (int), followed by all |
| 243 |
|
* of its elements (each a {@code double}) in the proper order. |
| 244 |
|
*/ |
| 245 |
|
private void writeObject(java.io.ObjectOutputStream s) |
| 246 |
< |
throws java.io.IOException{ |
| 246 |
> |
throws java.io.IOException { |
| 247 |
|
s.defaultWriteObject(); |
| 248 |
|
|
| 249 |
|
// Write out array length |
| 257 |
|
|
| 258 |
|
/** |
| 259 |
|
* Reconstitutes the instance from a stream (that is, deserializes it). |
| 260 |
+ |
* @param s the stream |
| 261 |
+ |
* @throws ClassNotFoundException if the class of a serialized object |
| 262 |
+ |
* could not be found |
| 263 |
+ |
* @throws java.io.IOException if an I/O error occurs |
| 264 |
|
*/ |
| 265 |
|
private void readObject(java.io.ObjectInputStream s) |
| 266 |
|
throws java.io.IOException, ClassNotFoundException { |
| 305 |
|
private static sun.misc.Unsafe getUnsafe() { |
| 306 |
|
try { |
| 307 |
|
return sun.misc.Unsafe.getUnsafe(); |
| 308 |
< |
} catch (SecurityException se) { |
| 309 |
< |
try { |
| 310 |
< |
return java.security.AccessController.doPrivileged |
| 311 |
< |
(new java.security |
| 312 |
< |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 313 |
< |
public sun.misc.Unsafe run() throws Exception { |
| 314 |
< |
java.lang.reflect.Field f = sun.misc |
| 315 |
< |
.Unsafe.class.getDeclaredField("theUnsafe"); |
| 316 |
< |
f.setAccessible(true); |
| 317 |
< |
return (sun.misc.Unsafe) f.get(null); |
| 318 |
< |
}}); |
| 319 |
< |
} catch (java.security.PrivilegedActionException e) { |
| 320 |
< |
throw new RuntimeException("Could not initialize intrinsics", |
| 321 |
< |
e.getCause()); |
| 322 |
< |
} |
| 308 |
> |
} catch (SecurityException tryReflectionInstead) {} |
| 309 |
> |
try { |
| 310 |
> |
return java.security.AccessController.doPrivileged |
| 311 |
> |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 312 |
> |
public sun.misc.Unsafe run() throws Exception { |
| 313 |
> |
Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class; |
| 314 |
> |
for (java.lang.reflect.Field f : k.getDeclaredFields()) { |
| 315 |
> |
f.setAccessible(true); |
| 316 |
> |
Object x = f.get(null); |
| 317 |
> |
if (k.isInstance(x)) |
| 318 |
> |
return k.cast(x); |
| 319 |
> |
} |
| 320 |
> |
throw new NoSuchFieldError("the Unsafe"); |
| 321 |
> |
}}); |
| 322 |
> |
} catch (java.security.PrivilegedActionException e) { |
| 323 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
| 324 |
> |
e.getCause()); |
| 325 |
|
} |
| 326 |
|
} |
| 327 |
|
} |
