| 5 |
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*/ |
| 6 |
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| 7 |
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package jsr166e; |
| 8 |
+ |
|
| 9 |
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import java.io.IOException; |
| 9 |
– |
import java.io.Serializable; |
| 10 |
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import java.io.ObjectInputStream; |
| 11 |
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import java.io.ObjectOutputStream; |
| 12 |
+ |
import java.io.Serializable; |
| 13 |
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|
| 14 |
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/** |
| 15 |
|
* One or more variables that together maintain an initially zero |
| 63 |
|
* @param x the value to add |
| 64 |
|
*/ |
| 65 |
|
public void add(double x) { |
| 66 |
< |
Cell[] as; long b, v; HashCode hc; Cell a; int n; |
| 66 |
> |
Cell[] as; long b, v; int[] hc; Cell a; int n; |
| 67 |
|
if ((as = cells) != null || |
| 68 |
|
!casBase(b = base, |
| 69 |
|
Double.doubleToRawLongBits |
| 70 |
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(Double.longBitsToDouble(b) + x))) { |
| 71 |
|
boolean uncontended = true; |
| 72 |
< |
int h = (hc = threadHashCode.get()).code; |
| 73 |
< |
if (as == null || (n = as.length) < 1 || |
| 74 |
< |
(a = as[(n - 1) & h]) == null || |
| 72 |
> |
if ((hc = threadHashCode.get()) == null || |
| 73 |
> |
as == null || (n = as.length) < 1 || |
| 74 |
> |
(a = as[(n - 1) & hc[0]]) == null || |
| 75 |
|
!(uncontended = a.cas(v = a.value, |
| 76 |
|
Double.doubleToRawLongBits |
| 77 |
|
(Double.longBitsToDouble(v) + x)))) |
| 81 |
|
|
| 82 |
|
/** |
| 83 |
|
* Returns the current sum. The returned value is <em>NOT</em> an |
| 84 |
< |
* atomic snapshot: Invocation in the absence of concurrent |
| 84 |
> |
* atomic snapshot; invocation in the absence of concurrent |
| 85 |
|
* updates returns an accurate result, but concurrent updates that |
| 86 |
|
* occur while the sum is being calculated might not be |
| 87 |
< |
* incorporated. Also, because double-precision arithmetic is not |
| 87 |
> |
* incorporated. Also, because floating-point arithmetic is not |
| 88 |
|
* strictly associative, the returned result need not be identical |
| 89 |
|
* to the value that would be obtained in a sequential series of |
| 90 |
|
* updates to a single variable. |
| 185 |
|
return (float)sum(); |
| 186 |
|
} |
| 187 |
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|
| 188 |
< |
private void writeObject(java.io.ObjectOutputStream s) |
| 188 |
< |
throws java.io.IOException { |
| 188 |
> |
private void writeObject(ObjectOutputStream s) throws IOException { |
| 189 |
|
s.defaultWriteObject(); |
| 190 |
|
s.writeDouble(sum()); |
| 191 |
|
} |
| 192 |
|
|
| 193 |
|
private void readObject(ObjectInputStream s) |
| 194 |
< |
throws IOException, ClassNotFoundException { |
| 194 |
> |
throws IOException, ClassNotFoundException { |
| 195 |
|
s.defaultReadObject(); |
| 196 |
|
busy = 0; |
| 197 |
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cells = null; |
