internal override void TryAlt(ref Worker wr, int i, Cont <X> xK, Else xE)
{
var pk = xE.pk;
var nk = Pick.ClaimAndAddNack(pk, i);
if (null != nk)
{
var cts = new CancellationTokenSource();
Task <X> xT;
try {
xT = this.Start(cts.Token);
} catch (Exception e) {
Pick.PickClaimedAndSetNacks(ref wr, i, pk);
cts.Dispose();
Handler.DoHandle(xK, ref wr, e);
return;
}
if (TaskStatus.RanToCompletion == xT.Status)
{
Pick.PickClaimedAndSetNacks(ref wr, i, pk);
cts.Dispose();
Cont.Do(xK, ref wr, xT.Result);
}
else
{
var state = new TaskToAltAwaiter <X>(cts, pk, i, xT, xK, wr.Scheduler);
nk.UnsafeAddReader(state);
Pick.Unclaim(pk);
var j = i + 1;
nk.I1 = j;
xT.ConfigureAwait(false).GetAwaiter().UnsafeOnCompleted(state.Ready);
xE.TryElse(ref wr, j);
}
}
}
internal override void TryAlt(ref Worker wr, int i, Cont <X> xK, Else xE)
{
var pk = xE.pk;
var cb = new AltCallback <X>(wr.Scheduler, this, xK, pk, -1);
var nk = Pick.ClaimAndAddNack(pk, i);
if (null != nk)
{
try {
cb.iar = DoBegin(StaticData.workAsyncCallback, cb);
} catch (Exception e) {
Pick.PickClaimedAndSetNacks(ref wr, i, pk);
Handler.DoHandle(xK, ref wr, e);
return;
}
var m = cb.me;
if (0 <= m || m != Interlocked.CompareExchange(ref cb.me, i, m))
{
Pick.PickClaimedAndSetNacks(ref wr, i, pk);
Cont.Do(xK, ref wr, DoEnd(cb.iar));
}
else
{
nk.UnsafeAddReader(cb);
Pick.Unclaim(pk);
var j = i + 1;
nk.I1 = j;
xE.TryElse(ref wr, j);
}
}
}