public static async Task ConcurrentLock()
{
using var are = new AutoResetEvent(false);
using var @lock = new AsyncExclusiveLock();
await @lock.AcquireAsync(TimeSpan.Zero);
var task = new TaskCompletionSource <bool>();
ThreadPool.QueueUserWorkItem(async state =>
{
False(await @lock.TryAcquireAsync(TimeSpan.FromMilliseconds(10)));
True(ThreadPool.QueueUserWorkItem(static ev => ev.Set(), are, false));
await @lock.AcquireAsync(DefaultTimeout);
@lock.Release();
task.SetResult(true);
});
public static async Task TrivialLock()
{
using var @lock = new AsyncExclusiveLock();
True(await @lock.TryAcquireAsync(TimeSpan.FromMilliseconds(10)));
False(await @lock.TryAcquireAsync(TimeSpan.FromMilliseconds(100)));
await ThrowsAsync <TimeoutException>(() => @lock.AcquireAsync(TimeSpan.FromMilliseconds(100)));
@lock.Release();
True(await @lock.TryAcquireAsync(TimeSpan.FromMilliseconds(100)));
}
public static void CancelSuspendedCallers()
{
using var @lock = new AsyncExclusiveLock();
True(@lock.TryAcquire());
var waitNode = @lock.AcquireAsync(CancellationToken.None);
False(waitNode.IsCompleted);
Throws <ArgumentOutOfRangeException>(() => @lock.CancelSuspendedCallers(new CancellationToken(false)));
@lock.CancelSuspendedCallers(new CancellationToken(true));
True(waitNode.IsCompleted);
False(waitNode.IsCompletedSuccessfully);
True(waitNode.IsCanceled);
}
public static void GracefulShutdown2()
{
using var @lock = new AsyncExclusiveLock();
True(@lock.TryAcquire());
var task = @lock.DisposeAsync();
False(task.IsCompleted);
var acquisition = @lock.AcquireAsync(CancellationToken.None);
False(acquisition.IsCompleted);
@lock.Release();
True(task.IsCompletedSuccessfully);
True(acquisition.IsFaulted);
Throws <ObjectDisposedException>(acquisition.GetAwaiter().GetResult);
}