void OnNext(PublisherMergeInner inner, R value)
{
if (bp.TryEnter())
{
long r = bp.Requested();
if (r != 0L)
{
actual.OnNext(value);
if (r != long.MaxValue)
{
bp.Produced(1);
}
inner.Request(1);
}
else
{
inner.Enqueue(value);
}
if (bp.Leave())
{
return;
}
}
else
{
inner.Enqueue(value);
if (!bp.Enter())
{
return;
}
}
DrainLoop();
}
void DrainLoop()
{
ISubscriber <R> a = actual;
int missed = 1;
for (;;)
{
bool d = IsDone();
PublisherMergeInner[] inners = Volatile.Read(ref subscribers);
int n = inners.Length;
bool empty = n == 0 && q.IsEmpty();
if (CheckTerminated(d, empty, a))
{
return;
}
long r = bp.Requested();
long e = 0L;
if (r != 0L)
{
if (q.IsConsumable())
{
while (e != r)
{
d = IsDone();
R t;
empty = !q.Poll(out t);
if (CheckTerminated(d, empty, a))
{
return;
}
if (empty)
{
break;
}
a.OnNext(t);
e++;
}
if (e != 0L)
{
r = bp.Produced(e);
s.Request(e);
e = 0L;
}
}
d = IsDone();
inners = Volatile.Read(ref subscribers);
n = inners.Length;
empty = n == 0 && q.IsEmpty();
if (CheckTerminated(d, empty, a))
{
return;
}
}
int idx = lastIndex;
if (idx >= n)
{
idx = 0;
}
for (int i = 0; i < n; i++)
{
PublisherMergeInner inner = inners[idx];
d = inner.IsDone();
empty = inner.IsEmpty();
if (d && empty)
{
Remove(inner);
s.Request(1);
inners = Volatile.Read(ref subscribers);
n = inners.Length;
idx--;
}
else
if (r != e && !empty)
{
while (e != r)
{
d = inner.IsDone();
R t;
empty = !inner.Poll(out t);
if (d && empty)
{
Remove(inner);
s.Request(1);
inners = Volatile.Read(ref subscribers);
n = inners.Length;
idx--;
break;
}
else
if (empty)
{
break;
}
a.OnNext(t);
e++;
}
d = inner.IsDone();
empty = inner.IsEmpty();
if (e == r && d && empty)
{
Remove(inner);
s.Request(1);
inners = Volatile.Read(ref subscribers);
n = inners.Length;
idx--;
}
if (e != 0L)
{
r = bp.Produced(e);
if (!d)
{
inner.Request((int)e);
}
e = 0L;
}
}
idx++;
if (idx >= n)
{
idx = 0;
}
}
d = IsDone();
inners = Volatile.Read(ref subscribers);
n = inners.Length;
empty = n == 0 && q.IsEmpty();
if (CheckTerminated(d, empty, a))
{
return;
}
lastIndex = idx;
missed = bp.Leave(missed);
if (missed == 0)
{
break;
}
}
}