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<TaskCanceledException>(async () =>
await monitor.WaitAsync(TimeSpan.FromMilliseconds(100).ToCancellationToken()));
sw.Stop();
Assert.InRange(sw.ElapsedMilliseconds, 75, 125);
var t = Task.Run(async () => {
await Task.Delay(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 Pulse_ReleasesOneWaiter()
{
AsyncContext.Run(async () =>
{
var monitor = new AsyncMonitor();
int completed = 0;
var task1Ready = new TaskCompletionSource();
var task2Ready = new TaskCompletionSource();
Task<IDisposable> lockTask1 = null;
Task waitTask1 = null;
var task1 = Task.Run(async () =>
{
lockTask1 = monitor.EnterAsync();
using (await lockTask1)
{
waitTask1 = monitor.WaitAsync();
task1Ready.SetResult();
await waitTask1;
Interlocked.Increment(ref completed);
}
});
await task1Ready.Task;
Task<IDisposable> lockTask2 = null;
Task waitTask2 = null;
var task2 = Task.Run(async () =>
{
lockTask2 = monitor.EnterAsync();
using (await lockTask2)
{
waitTask2 = monitor.WaitAsync();
task2Ready.SetResult();
await waitTask2;
Interlocked.Increment(ref completed);
}
});
await task2Ready.Task;
Task<IDisposable> lockTask3 = monitor.EnterAsync();
using (await lockTask3)
{
monitor.Pulse();
}
await Task.WhenAny(task1, task2);
var result = Interlocked.CompareExchange(ref completed, 0, 0);
Assert.AreEqual(1, result);
});
}
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);
});
}