| 7 |
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package jsr166y; |
| 8 |
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|
| 9 |
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import java.util.concurrent.*; |
| 10 |
< |
import java.util.concurrent.atomic.*; |
| 10 |
> |
|
| 11 |
> |
import java.util.concurrent.atomic.AtomicReference; |
| 12 |
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import java.util.concurrent.locks.LockSupport; |
| 12 |
– |
import sun.misc.Unsafe; |
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– |
import java.lang.reflect.*; |
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| 14 |
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/** |
| 15 |
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* A reusable synchronization barrier, similar in functionality to a |
| 930 |
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return p; |
| 931 |
|
} |
| 932 |
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|
| 933 |
< |
// Temporary Unsafe mechanics for preliminary release |
| 934 |
< |
private static Unsafe getUnsafe() throws Throwable { |
| 933 |
> |
// Unsafe mechanics for jsr166y 3rd party package. |
| 934 |
> |
private static sun.misc.Unsafe getUnsafe() { |
| 935 |
|
try { |
| 936 |
< |
return Unsafe.getUnsafe(); |
| 936 |
> |
return sun.misc.Unsafe.getUnsafe(); |
| 937 |
|
} catch (SecurityException se) { |
| 938 |
|
try { |
| 939 |
|
return java.security.AccessController.doPrivileged |
| 940 |
< |
(new java.security.PrivilegedExceptionAction<Unsafe>() { |
| 941 |
< |
public Unsafe run() throws Exception { |
| 942 |
< |
return getUnsafePrivileged(); |
| 940 |
> |
(new java.security.PrivilegedExceptionAction<sun.misc.Unsafe>() { |
| 941 |
> |
public sun.misc.Unsafe run() throws Exception { |
| 942 |
> |
return getUnsafeByReflection(); |
| 943 |
|
}}); |
| 944 |
|
} catch (java.security.PrivilegedActionException e) { |
| 945 |
< |
throw e.getCause(); |
| 945 |
> |
throw new RuntimeException("Could not initialize intrinsics", |
| 946 |
> |
e.getCause()); |
| 947 |
|
} |
| 948 |
|
} |
| 949 |
|
} |
| 950 |
|
|
| 951 |
< |
private static Unsafe getUnsafePrivileged() |
| 951 |
> |
private static sun.misc.Unsafe getUnsafeByReflection() |
| 952 |
|
throws NoSuchFieldException, IllegalAccessException { |
| 953 |
< |
Field f = Unsafe.class.getDeclaredField("theUnsafe"); |
| 953 |
> |
java.lang.reflect.Field f = |
| 954 |
> |
sun.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
| 955 |
|
f.setAccessible(true); |
| 956 |
< |
return (Unsafe) f.get(null); |
| 956 |
< |
} |
| 957 |
< |
|
| 958 |
< |
private static long fieldOffset(String fieldName) |
| 959 |
< |
throws NoSuchFieldException { |
| 960 |
< |
return UNSAFE.objectFieldOffset |
| 961 |
< |
(Phaser.class.getDeclaredField(fieldName)); |
| 956 |
> |
return (sun.misc.Unsafe) f.get(null); |
| 957 |
|
} |
| 958 |
|
|
| 959 |
< |
static final Unsafe UNSAFE; |
| 965 |
< |
static final long stateOffset; |
| 966 |
< |
|
| 967 |
< |
static { |
| 959 |
> |
private static long fieldOffset(String fieldName, Class<?> klazz) { |
| 960 |
|
try { |
| 961 |
< |
UNSAFE = getUnsafe(); |
| 962 |
< |
stateOffset = fieldOffset("state"); |
| 963 |
< |
} catch (Throwable e) { |
| 964 |
< |
throw new RuntimeException("Could not initialize intrinsics", e); |
| 961 |
> |
return UNSAFE.objectFieldOffset(klazz.getDeclaredField(fieldName)); |
| 962 |
> |
} catch (NoSuchFieldException e) { |
| 963 |
> |
// Convert Exception to Error |
| 964 |
> |
NoSuchFieldError error = new NoSuchFieldError(fieldName); |
| 965 |
> |
error.initCause(e); |
| 966 |
> |
throw error; |
| 967 |
|
} |
| 968 |
|
} |
| 969 |
|
|
| 970 |
+ |
private static final sun.misc.Unsafe UNSAFE = getUnsafe(); |
| 971 |
+ |
static final long stateOffset = |
| 972 |
+ |
fieldOffset("state", Phaser.class); |
| 973 |
+ |
|
| 974 |
|
final boolean casState(long cmp, long val) { |
| 975 |
|
return UNSAFE.compareAndSwapLong(this, stateOffset, cmp, val); |
| 976 |
|
} |
