public void Pulse_ReleasesOneWaiter()
{
Test.Async(async() =>
{
var monitor = new AsyncMonitor();
int completed = 0;
var task1Ready = new TaskCompletionSource();
var task2Ready = new TaskCompletionSource();
var task1 = TaskShim.Run(async() =>
{
using (await monitor.EnterAsync())
{
var waitTask1 = monitor.WaitAsync();
task1Ready.SetResult();
await waitTask1;
Interlocked.Increment(ref completed);
}
});
await task1Ready.Task;
var task2 = TaskShim.Run(async() =>
{
using (await monitor.EnterAsync())
{
var waitTask2 = monitor.WaitAsync();
task2Ready.SetResult();
await waitTask2;
Interlocked.Increment(ref completed);
}
});
await task2Ready.Task;
using (await monitor.EnterAsync())
{
monitor.Pulse();
}
await TaskShim.WhenAny(task1, task2);
var result = Interlocked.CompareExchange(ref completed, 0, 0);
Assert.AreEqual(1, result);
});
}
public async Task Pulse_ReleasesOneWaiter()
{
AsyncMonitor monitor = new AsyncMonitor();
int[] completed = { 0 };
TaskCompletionSource <object> task1Ready = TaskCompletionSourceExtensions.CreateAsyncTaskSource <object>();
TaskCompletionSource <object> task2Ready = TaskCompletionSourceExtensions.CreateAsyncTaskSource <object>();
Task task1 = Task.Run(async() =>
{
using (await monitor.EnterAsync())
{
Task waitTask1 = monitor.WaitAsync();
task1Ready.SetResult(null);
await waitTask1;
Interlocked.Increment(ref completed[0]);
}
});
await task1Ready.Task;
Task task2 = Task.Run(async() =>
{
using (await monitor.EnterAsync())
{
Task waitTask2 = monitor.WaitAsync();
task2Ready.SetResult(null);
await waitTask2;
Interlocked.Increment(ref completed[0]);
}
});
await task2Ready.Task;
using (await monitor.EnterAsync())
{
monitor.Pulse();
}
await Task.WhenAny(task1, task2).ConfigureAwait(false);
int result = Interlocked.CompareExchange(ref completed[0], 0, 0);
Assert.Equal(1, result);
}
public async Task Pulse_ReleasesOneWaiter()
{
var monitor = new AsyncMonitor();
int completed = 0;
var task1Ready = TaskCompletionSourceExtensions.CreateAsyncTaskSource <object>();
var task2Ready = TaskCompletionSourceExtensions.CreateAsyncTaskSource <object>();
var task1 = Task.Run(async() =>
{
using (await monitor.EnterAsync())
{
var waitTask1 = monitor.WaitAsync();
task1Ready.SetResult(null);
await waitTask1;
Interlocked.Increment(ref completed);
}
});
await task1Ready.Task;
var task2 = Task.Run(async() =>
{
using (await monitor.EnterAsync())
{
var waitTask2 = monitor.WaitAsync();
task2Ready.SetResult(null);
await waitTask2;
Interlocked.Increment(ref completed);
}
});
await task2Ready.Task;
using (await monitor.EnterAsync())
{
monitor.Pulse();
}
await Task.WhenAny(task1, task2);
var result = Interlocked.CompareExchange(ref completed, 0, 0);
Assert.Equal(1, result);
}
public async Task Locked_PreventsLockUntilUnlocked()
{
var monitor = new AsyncMonitor();
var task1HasLock = TaskCompletionSourceExtensions.CreateAsyncTaskSource <object>();
var task1Continue = TaskCompletionSourceExtensions.CreateAsyncTaskSource <object>();
var task1 = Task.Run(async() =>
{
using (await monitor.EnterAsync())
{
task1HasLock.SetResult(null);
await task1Continue.Task;
}
});
await task1HasLock.Task;
var lockTask = monitor.EnterAsync().AsTask();
Assert.False(lockTask.IsCompleted);
task1Continue.SetResult(null);
await lockTask;
}
public async Task <byte[]> ReadAsync(string fileName)
{
if (_cache.ContainsKey(fileName))
{
return(_cache[fileName]);
}
using (await AsyncMonitor.EnterAsync(fileName))
{
// double check cache since it can be populated in another thread
if (_cache.ContainsKey(fileName))
{
return(_cache[fileName]);
}
var fileData = await _fileReader.ReadAsync(fileName);
RealReadCallCount++;
_cache[fileName] = fileData;
return(fileData);
}
}
public async Task WillPulseMonitor()
{
var monitor = new AsyncMonitor();
var sw = Stopwatch.StartNew();
// Monitor will not be pulsed and should be cancelled after 100ms.
using (await monitor.EnterAsync())
await Assert.ThrowsAsync <OperationCanceledException>(() => monitor.WaitAsync(TimeSpan.FromMilliseconds(100).ToCancellationToken()));
sw.Stop();
Assert.InRange(sw.ElapsedMilliseconds, 75, 125);
var t = Task.Run(async() => {
await SystemClock.SleepAsync(25);
using (await monitor.EnterAsync())
monitor.Pulse();
});
sw = Stopwatch.StartNew();
using (await monitor.EnterAsync())
await monitor.WaitAsync(TimeSpan.FromSeconds(1).ToCancellationToken());
sw.Stop();
Assert.InRange(sw.ElapsedMilliseconds, 25, 100);
}
public void Locked_PreventsLockUntilUnlocked()
{
Test.Async(async() =>
{
var monitor = new AsyncMonitor();
var task1HasLock = new TaskCompletionSource();
var task1Continue = new TaskCompletionSource();
var task1 = TaskShim.Run(async() =>
{
using (await monitor.EnterAsync())
{
task1HasLock.SetResult();
await task1Continue.Task;
}
});
await task1HasLock.Task;
var lockTask = monitor.EnterAsync().AsTask();
Assert.IsFalse(lockTask.IsCompleted);
task1Continue.SetResult();
await lockTask;
});
}
public void Id_IsNotZero()
{
var monitor = new AsyncMonitor();
Assert.NotEqual(0, monitor.Id);
}
