public void WaitAsync_Cancelled_DoesNotTakeSlot()
{
AsyncContext.Run(async () =>
{
var semaphore = new AsyncSemaphore(0);
Assert.AreEqual(0, semaphore.CurrentCount);
var cts = new CancellationTokenSource();
var task = semaphore.WaitAsync(cts.Token);
Assert.AreEqual(0, semaphore.CurrentCount);
Assert.IsFalse(task.IsCompleted);
cts.Cancel();
try
{
await task;
}
catch (OperationCanceledException)
{
}
semaphore.Release();
Assert.AreEqual(1, semaphore.CurrentCount);
Assert.IsTrue(task.IsCanceled);
});
}
public void WaitAsync_NoSlotsAvailable_IsNotCompleted()
{
Test.Async(async () =>
{
var semaphore = new AsyncSemaphore(0);
Assert.AreEqual(0, semaphore.CurrentCount);
var task = semaphore.WaitAsync();
Assert.AreEqual(0, semaphore.CurrentCount);
await AssertEx.NeverCompletesAsync(task);
});
}
public void WaitAsync_PreCancelled_NoSlotAvailable_CancelsSynchronously()
{
var semaphore = new AsyncSemaphore(0);
Assert.AreEqual(0, semaphore.CurrentCount);
var token = new CancellationToken(true);
var task = semaphore.WaitAsync(token);
Assert.AreEqual(0, semaphore.CurrentCount);
Assert.IsTrue(task.IsCompleted);
Assert.IsTrue(task.IsCanceled);
Assert.IsFalse(task.IsFaulted);
}
public void WaitAsync_SlotAvailable_IsCompleted()
{
Test.Async(async () =>
{
var semaphore = new AsyncSemaphore(1);
Assert.AreEqual(1, semaphore.CurrentCount);
var task1 = semaphore.WaitAsync();
Assert.AreEqual(0, semaphore.CurrentCount);
Assert.IsTrue(task1.IsCompleted);
var task2 = semaphore.WaitAsync();
Assert.AreEqual(0, semaphore.CurrentCount);
await AssertEx.NeverCompletesAsync(task2);
});
}
public DebugView(AsyncSemaphore semaphore)
{
_semaphore = semaphore;
}
public DebugView(AsyncSemaphore semaphore)
{
_semaphore = semaphore;
}
public void Id_IsNotZero()
{
var semaphore = new AsyncSemaphore(0);
Assert.AreNotEqual(0, semaphore.Id);
}
public void Release_ZeroSlots_HasNoEffect()
{
var semaphore = new AsyncSemaphore(1);
Assert.AreEqual(1, semaphore.CurrentCount);
semaphore.Release(0);
Assert.AreEqual(1, semaphore.CurrentCount);
}
public void Release_Overflow_ThrowsException()
{
var semaphore = new AsyncSemaphore(int.MaxValue);
Assert.AreEqual(int.MaxValue, semaphore.CurrentCount);
AssertEx.ThrowsException<InvalidOperationException>(() => semaphore.Release());
}
public void Release_WithWaiters_ReleasesWaiters()
{
Test.Async(async () =>
{
var semaphore = new AsyncSemaphore(0);
Assert.AreEqual(0, semaphore.CurrentCount);
var task = semaphore.WaitAsync();
Assert.AreEqual(0, semaphore.CurrentCount);
Assert.IsFalse(task.IsCompleted);
semaphore.Release();
Assert.AreEqual(0, semaphore.CurrentCount);
await task;
});
}
public void Release_WithoutWaiters_IncrementsCount()
{
var semaphore = new AsyncSemaphore(0);
Assert.AreEqual(0, semaphore.CurrentCount);
semaphore.Release();
Assert.AreEqual(1, semaphore.CurrentCount);
var task = semaphore.WaitAsync();
Assert.AreEqual(0, semaphore.CurrentCount);
Assert.IsTrue(task.IsCompleted);
}