40 |
|
* |
41 |
|
* A single spinlock ("busy") is used for initializing and |
42 |
|
* resizing the table, as well as populating slots with new Cells. |
43 |
< |
* There is no need for a blocking lock: When the lock is not |
43 |
> |
* There is no need for a blocking lock; when the lock is not |
44 |
|
* available, threads try other slots (or the base). During these |
45 |
|
* retries, there is increased contention and reduced locality, |
46 |
|
* which is still better than alternatives. |
319 |
|
private static sun.misc.Unsafe getUnsafe() { |
320 |
|
try { |
321 |
|
return sun.misc.Unsafe.getUnsafe(); |
322 |
< |
} catch (SecurityException se) { |
323 |
< |
try { |
324 |
< |
return java.security.AccessController.doPrivileged |
325 |
< |
(new java.security |
326 |
< |
.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
327 |
< |
public sun.misc.Unsafe run() throws Exception { |
328 |
< |
java.lang.reflect.Field f = sun.misc |
329 |
< |
.Unsafe.class.getDeclaredField("theUnsafe"); |
330 |
< |
f.setAccessible(true); |
331 |
< |
return (sun.misc.Unsafe) f.get(null); |
332 |
< |
}}); |
333 |
< |
} catch (java.security.PrivilegedActionException e) { |
334 |
< |
throw new RuntimeException("Could not initialize intrinsics", |
335 |
< |
e.getCause()); |
336 |
< |
} |
322 |
> |
} catch (SecurityException tryReflectionInstead) {} |
323 |
> |
try { |
324 |
> |
return java.security.AccessController.doPrivileged |
325 |
> |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
326 |
> |
public sun.misc.Unsafe run() throws Exception { |
327 |
> |
Class<sun.misc.Unsafe> k = sun.misc.Unsafe.class; |
328 |
> |
for (java.lang.reflect.Field f : k.getDeclaredFields()) { |
329 |
> |
f.setAccessible(true); |
330 |
> |
Object x = f.get(null); |
331 |
> |
if (k.isInstance(x)) |
332 |
> |
return k.cast(x); |
333 |
> |
} |
334 |
> |
throw new NoSuchFieldError("the Unsafe"); |
335 |
> |
}}); |
336 |
> |
} catch (java.security.PrivilegedActionException e) { |
337 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
338 |
> |
e.getCause()); |
339 |
|
} |
340 |
|
} |
339 |
– |
|
341 |
|
} |