public class AtomicDoubleArray extends Objectimplements Serializable
double
array in which elements may be updated atomically. See the
java.util.concurrent.atomic
package specification for description of the properties of atomic variables.
This class compares primitive double
values in methods such as compareAndSet(int, double, double)
by comparing their bitwise representation using Double
, which differs from both the primitive double ==
operator and from Double
, as if implemented by:
static boolean bitEquals(double x, double y) { long xBits = Double.doubleToRawLongBits(x); long yBits = Double.doubleToRawLongBits(y); return xBits == yBits; }
Constructor and Description |
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AtomicDoubleArray(double[] array)
Creates a new
AtomicDoubleArray with the same length as, and all elements copied from, the given array.
|
AtomicDoubleArray(int length)
Creates a new
AtomicDoubleArray of the given length, with all elements initially zero.
|
Modifier and Type | Method and Description |
---|---|
double |
addAndGet(int i, double delta)
Atomically adds the given value to the element at index
i .
|
boolean |
compareAndSet(int i, double expect, double update)
Atomically sets the element at position
i to the given updated value if the current value is
bitwise equal to the expected value.
|
double |
get(int i)
Gets the current value at position
i .
|
double |
getAndAdd(int i, double delta)
Atomically adds the given value to the element at index
i .
|
double |
getAndSet(int i, double newValue)
Atomically sets the element at position
i to the given value and returns the old value.
|
void |
lazySet(int i, double newValue)
Eventually sets the element at position
i to the given value.
|
int |
length()
Returns the length of the array.
|
void |
set(int i, double newValue)
Sets the element at position
i to the given value.
|
String |
toString()
Returns the String representation of the current values of array.
|
boolean |
weakCompareAndSet(int i, double expect, double update)
Atomically sets the element at position
i to the given updated value if the current value is
bitwise equal to the expected value.
|
public AtomicDoubleArray(int length)
AtomicDoubleArray
of the given length, with all elements initially zero.
length
- the length of the array
public AtomicDoubleArray(double[] array)
AtomicDoubleArray
with the same length as, and all elements copied from, the given array.
array
- the array to copy elements from
NullPointerException
- if array is null
public final int length()
public final double get(int i)
i
.
i
- the index
public final void set(int i, double newValue)
i
to the given value.
i
- the index
newValue
- the new value
public final void lazySet(int i, double newValue)
i
to the given value.
i
- the index
newValue
- the new value
public final double getAndSet(int i, double newValue)
i
to the given value and returns the old value.
i
- the index
newValue
- the new value
public final boolean compareAndSet(int i, double expect, double update)
i
to the given updated value if the current value is
bitwise equal to the expected value.
i
- the index
expect
- the expected value
update
- the new value
public final boolean weakCompareAndSet(int i, double expect, double update)
i
to the given updated value if the current value is
bitwise equal to the expected value.
May fail spuriously and does not provide ordering guarantees, so is only rarely an appropriate alternative to compareAndSet
.
i
- the index
expect
- the expected value
update
- the new value
public final double getAndAdd(int i, double delta)
i
.
i
- the index
delta
- the value to add
public double addAndGet(int i, double delta)
i
.
i
- the index
delta
- the value to add