public ValueTask DisposeAsync()
{
CancellationHelper.Cancel(ref _cts);
if (Interlocked.Increment(ref _disposeWip) == 1)
{
if (_emitLast)
{
_emitLastItem = default;
}
return(_source.DisposeAsync());
}
return(ResumeHelper.Await(ref _disposeTask));
}
private void HandleMain(Task <bool> t)
{
if (t.IsCanceled)
{
_error = new OperationCanceledException();
_done = true;
if (TryDispose())
{
ResumeHelper.Resume(ref _resume);
}
}
else if (t.IsFaulted)
{
CancellationHelper.Cancel(ref _cts);
if (_emitLast)
{
var idx = _sourceIndex;
if (idx != 0)
{
SetLatest(_emitLastItem, idx + 1);
_emitLastItem = default;
}
}
_error = ExceptionHelper.Extract(t.Exception);
_done = true;
if (TryDispose())
{
ResumeHelper.Resume(ref _resume);
}
}
else if (t.Result)
{
Volatile.Read(ref _cts)?.Cancel();
var v = _source.Current;
if (TryDispose())
{
if (_emitLast)
{
_emitLastItem = v;
}
var idx = ++_sourceIndex;
var newCts = CancellationTokenSource.CreateLinkedTokenSource(_ct);
if (CancellationHelper.Replace(ref _cts, newCts))
{
Task.Delay(_delay, newCts.Token)
.ContinueWith(tt => TimerHandler(tt, v, idx), newCts.Token);
MoveNext();
}
}
}
else
{
CancellationHelper.Cancel(ref _cts);
if (_emitLast)
{
var idx = _sourceIndex;
if (idx != 0)
{
SetLatest(_emitLastItem, idx + 1);
_emitLastItem = default;
}
}
_done = true;
if (TryDispose())
{
ResumeHelper.Resume(ref _resume);
}
}
}