/// <summary>
/// Cancels any ongoing evaluations or interaction processing.
/// </summary>
public async Task CancelAllAsync(CancellationToken cancellationToken = default(CancellationToken)) {
if (_runTask == null) {
// Nothing to cancel.
return;
}
await TaskUtilities.SwitchToBackgroundThread();
var tcs = new TaskCompletionSource<object>();
if (Interlocked.CompareExchange(ref _cancelAllTcs, tcs, null) != null) {
// Cancellation is already in progress - do nothing.
return;
}
using (tcs.RegisterForCancellation(_cts.Token))
using (tcs.RegisterForCancellation(cancellationToken)) {
try {
// Cancel any pending callbacks
_cancelAllCts.Cancel();
var cts = CancellationTokenSource.CreateLinkedTokenSource(_cts.Token, cancellationToken);
try {
await NotifyAsync("!//", cts.Token);
} catch (OperationCanceledException) {
return;
} catch (MessageTransportException) {
return;
} finally {
cts.Dispose();
}
await tcs.Task;
} finally {
Volatile.Write(ref _cancelAllTcs, null);
}
}
}
public QueueItem(bool isAwaitable, CancellationToken cancellationToken)
{
_tcs = new TaskCompletionSource <IDisposable>(TaskCreationOptions.RunContinuationsAsynchronously);
IsAwaitable = isAwaitable;
_tcs.RegisterForCancellation(cancellationToken).UnregisterOnCompletion(_tcs.Task);
}
public static CancellationTokenRegistration RegisterForCancellation <T>(this TaskCompletionSource <T> taskCompletionSource, CancellationToken cancellationToken) => taskCompletionSource.RegisterForCancellation(-1, cancellationToken);
public PrioritizerDisposable(CancellationToken cancellationToken)
{
_tcs = new TaskCompletionSource <int>();
_tcs.RegisterForCancellation(cancellationToken).UnregisterOnCompletion(_tcs.Task);
}
public QueueItem(bool isAwaitable, CancellationToken cancellationToken)
{
_tcs = new TaskCompletionSource <IDisposable>();
IsAwaitable = isAwaitable;
_tcs.RegisterForCancellation(cancellationToken).UnregisterOnCompletion(_tcs.Task);
}
