/// <summary>
/// キャンセル伝搬しつつ、タイムアウト時にキャンセルするctsを作る。
/// </summary>
public static CancellationTokenSource CancelAfter(this CancellationToken ct, TimeSpan timeout)
{
var cts = ct.ToCancellationTokenSourceOneWay();
DelayTimer(timeout, () => cts.Cancel(new TimeoutException()));
return(cts);
}
public static Task <T> First <T>(CancellationToken ct, params Task <T>[] tasks)
{
var cts = ct.ToCancellationTokenSourceOneWay();
return(First(cts, tasks));
}
