public void Dequeue_OnMultipleThreads(AllocationMode allocationMode)
{
using (var queue = AtomicQueue <int> .Create(allocationMode))
{
Assert.That(queue.IsEmpty);
int popped = 0;
for (int i = 0; i < kWorkerCount; ++i)
{
queue.Enqueue((int *)i);
}
for (int i = 0; i < kWorkerCount; ++i)
{
ThreadPool.QueueUserWorkItem(o =>
{
queue.Dequeue();
Interlocked.Increment(ref popped);
});
}
while (popped < kWorkerCount)
{
Utility.YieldProcessor();
}
Assert.That(queue.IsEmpty);
}
}
public void Enqueue(AllocationMode allocationMode)
{
using (var queue = AtomicQueue <int> .Create(allocationMode))
{
Assert.That(queue.IsEmpty);
queue.Enqueue((int *)1);
Assert.That(!queue.IsEmpty);
}
}
public void Peek_AtEmptyQueue_Throws()
{
using (var queue = AtomicQueue <int> .Create())
{
Assert.Throws <InvalidOperationException>(() => { queue.Peek(); });
queue.Enqueue((int *)1);
queue.Dequeue();
Assert.Throws <InvalidOperationException>(() => { queue.Peek(); });
}
}
public void TryDequeue_FromEmptyQueue_IsOkay()
{
using (var queue = AtomicQueue <int> .Create())
{
Assert.False(queue.TryDequeue(out int *result));
queue.Enqueue((int *)1);
Assert.True(queue.TryDequeue(out result));
Assert.False(queue.TryDequeue(out result));
}
}
public void PreservesItems_WithSimultaneousQueueDequeue(AllocationMode allocationMode)
{
using (var queue = AtomicQueue <int> .Create(allocationMode))
{
var count = 0;
var allItems = new HashSet <int>();
var foundItems = new HashSet <int>();
var threads = new List <Thread>();
for (int i = 0; i < kWorkerCount; ++i)
{
allItems.Add(i + 1);
var thread = new Thread((o) =>
{
try
{
var item = Interlocked.Increment(ref count);
queue.Enqueue((int *)item);
}
catch (Exception e)
{
Debug.LogException(e);
}
});
thread.Start();
threads.Add(thread);
if (queue.TryDequeue(out var result))
{
foundItems.Add((int)result);
}
}
foreach (var thread in threads)
{
thread.Join();
}
while (foundItems.Count < kWorkerCount)
{
if (queue.TryDequeue(out var item))
{
foundItems.Add((int)item);
}
else
{
Assert.Fail($"After adding was completed, queue was empty after popping only {foundItems.Count} items");
return;
}
}
Assert.That(queue.IsEmpty);
CollectionAssert.AreEquivalent(allItems, foundItems);
}
}
public void TryDequeue(AllocationMode allocationMode)
{
using (var queue = AtomicQueue <int> .Create(allocationMode))
{
var value = (int *)Random.Range(1, int.MaxValue);
Assert.That(queue.IsEmpty);
queue.Enqueue(value);
Assert.That(!queue.IsEmpty);
Assert.That(queue.TryDequeue(out var result) && result == value);
Assert.That(queue.IsEmpty);
}
}
public void Peek(AllocationMode allocationMode)
{
using (var queue = AtomicQueue <int> .Create(allocationMode))
{
var value = (int *)Random.Range(1, int.MaxValue);
Assert.That(queue.IsEmpty);
queue.Enqueue(value);
queue.Enqueue(null);
Assert.That(!queue.IsEmpty);
Assert.That(queue.Peek() == value);
Assert.That(queue.Peek() == value);
Assert.That(queue.Peek() == value);
}
}
public void Empty_ThenReenqueue(AllocationMode allocationMode)
{
var value = (int *)Random.Range(1, int.MaxValue);
using (var queue = AtomicQueue <int> .Create(allocationMode))
{
Assert.That(queue.IsEmpty);
queue.Enqueue(value);
Assert.That(!queue.IsEmpty);
Assert.AreEqual((long)value, (long)queue.Dequeue());
Assert.That(queue.IsEmpty);
queue.Enqueue(value);
Assert.That(!queue.IsEmpty);
Assert.AreEqual((long)value, (long)queue.Dequeue());
Assert.That(queue.IsEmpty);
}
}
public void PreservesItems(AllocationMode allocationMode)
{
using (var queue = AtomicQueue <int> .Create(allocationMode))
{
var count = 0;
var items = new HashSet <int>();
var threads = new List <Thread>();
for (int i = 0; i < kWorkerCount; ++i)
{
var thread = new Thread((o) =>
{
var item = Interlocked.Increment(ref count);
queue.Enqueue((int *)item);
});
items.Add(i + 1);
thread.Start();
threads.Add(thread);
}
foreach (var thread in threads)
{
thread.Join();
}
Assert.That(!queue.IsEmpty);
for (int i = 0; i < kWorkerCount; ++i)
{
var item = (int)queue.Dequeue();
Assert.That(items.Contains(item), $"Missing item {item} (iteration {i})");
items.Remove(item);
}
Assert.That(queue.IsEmpty);
Assert.That(items.Count == 0);
}
}