public void CompareExistingValueAndSetNewValue()
{
AtomicIntegerArray ai = new AtomicIntegerArray(DEFAULT_COLLECTION_SIZE);
for (int i = 0; i < DEFAULT_COLLECTION_SIZE; ++i)
{
ai[i] = 1;
Assert.IsTrue(ai.CompareAndSet(i, 1, 2));
Assert.IsTrue(ai.CompareAndSet(i, 2, -4));
Assert.AreEqual(-4, ai[i]);
Assert.IsFalse(ai.CompareAndSet(i, -5, 7));
Assert.IsFalse(7 == ai[i]);
Assert.IsTrue(ai.CompareAndSet(i, -4, 7));
Assert.AreEqual(7, ai[i]);
}
}
public void CompareAndSetInMultipleThreads()
{
AtomicIntegerArray a = new AtomicIntegerArray(1);
a[0] = 1;
Thread t = ThreadManager.StartAndAssertRegistered(
"T1", () => { while (!a.CompareAndSet(0, 2, 3))
{
Thread.Sleep(0);
}
});
Assert.IsTrue(a.CompareAndSet(0, 1, 2));
ThreadManager.JoinAndVerify(Delays.Long);
Assert.IsFalse(t.IsAlive);
Assert.AreEqual(a[0], 3);
}
public void Run()
{
for (; ;)
{
bool done = true;
for (int i = 0; i < ai.Count; ++i)
{
int v = ai[i];
Assert.IsTrue(v >= 0);
if (v != 0)
{
done = false;
if (ai.CompareAndSet(i, v, v - 1))
{
++counts;
}
}
}
if (done)
{
break;
}
}
}