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8155965: Unsafe.weakCompareAndSetVolatile entry points and intrinsics

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Reviewed-by: psandoz, vlivanov
This commit is contained in:
Aleksey Shipilev 2016-05-06 17:59:49 +03:00
parent 3d8d9fe7fa
commit 85f537701c
1 changed files with 21 additions and 0 deletions
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21
jdk/src/java.base/share/classes/jdk/internal/misc/Unsafe.java
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@ -1271,6 +1271,13 @@ public final class Unsafe {
return compareAndSwapObject(o, offset, expected, x);
}
@HotSpotIntrinsicCandidate
public final boolean weakCompareAndSwapObjectVolatile(Object o, long offset,
Object expected,
Object x) {
return compareAndSwapObject(o, offset, expected, x);
}
/**
* Atomically updates Java variable to {@code x} if it is currently
* holding {@code expected}.
@ -1325,6 +1332,13 @@ public final class Unsafe {
return compareAndSwapInt(o, offset, expected, x);
}
@HotSpotIntrinsicCandidate
public final boolean weakCompareAndSwapIntVolatile(Object o, long offset,
int expected,
int x) {
return compareAndSwapInt(o, offset, expected, x);
}
/**
* Atomically updates Java variable to {@code x} if it is currently
* holding {@code expected}.
@ -1379,6 +1393,13 @@ public final class Unsafe {
return compareAndSwapLong(o, offset, expected, x);
}
@HotSpotIntrinsicCandidate
public final boolean weakCompareAndSwapLongVolatile(Object o, long offset,
long expected,
long x) {
return compareAndSwapLong(o, offset, expected, x);
}
/**
* Fetches a reference value from a given Java variable, with volatile
* load semantics. Otherwise identical to {@link #getObject(Object, long)}