src/share/classes/java/util/concurrent/atomic/AtomicLong.java
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@@ -127,16 +127,12 @@
*
* @param newValue the new value
* @return the previous value
*/
public final long getAndSet(long newValue) {
- while (true) {
- long current = get();
- if (compareAndSet(current, newValue))
- return current;
+ return unsafe.getAndSetLong(this, valueOffset, newValue);
}
- }
/**
* Atomically sets the value to the given updated value
* if the current value {@code ==} the expected value.
*
@@ -157,11 +153,11 @@
* and does not provide ordering guarantees, so is only rarely an
* appropriate alternative to {@code compareAndSet}.
*
* @param expect the expected value
* @param update the new value
- * @return true if successful.
+ * @return true if successful
*/
public final boolean weakCompareAndSet(long expect, long update) {
return unsafe.compareAndSwapLong(this, valueOffset, expect, update);
}
@@ -169,93 +165,63 @@
* Atomically increments by one the current value.
*
* @return the previous value
*/
public final long getAndIncrement() {
- while (true) {
- long current = get();
- long next = current + 1;
- if (compareAndSet(current, next))
- return current;
+ return getAndAdd(1);
}
- }
/**
* Atomically decrements by one the current value.
*
* @return the previous value
*/
public final long getAndDecrement() {
- while (true) {
- long current = get();
- long next = current - 1;
- if (compareAndSet(current, next))
- return current;
+ return getAndAdd(-1);
}
- }
/**
* Atomically adds the given value to the current value.
*
* @param delta the value to add
* @return the previous value
*/
public final long getAndAdd(long delta) {
- while (true) {
- long current = get();
- long next = current + delta;
- if (compareAndSet(current, next))
- return current;
+ return unsafe.getAndAddLong(this, valueOffset, delta);
}
- }
/**
* Atomically increments by one the current value.
*
* @return the updated value
*/
public final long incrementAndGet() {
- for (;;) {
- long current = get();
- long next = current + 1;
- if (compareAndSet(current, next))
- return next;
+ return getAndAdd(1) + 1;
}
- }
/**
* Atomically decrements by one the current value.
*
* @return the updated value
*/
public final long decrementAndGet() {
- for (;;) {
- long current = get();
- long next = current - 1;
- if (compareAndSet(current, next))
- return next;
+ return getAndAdd(-1) - 1;
}
- }
/**
* Atomically adds the given value to the current value.
*
* @param delta the value to add
* @return the updated value
*/
public final long addAndGet(long delta) {
- for (;;) {
- long current = get();
- long next = current + delta;
- if (compareAndSet(current, next))
- return next;
+ return getAndAdd(delta) + delta;
}
- }
/**
* Returns the String representation of the current value.
- * @return the String representation of the current value.
+ * @return the String representation of the current value
*/
public String toString() {
return Long.toString(get());
}