internal void InnerComplete(T value, bool hasValue)
{
if (hasValue)
{
for (;;)
{
var sp = AddValue(value);
if (sp == null)
{
break;
}
try
{
value = reducer(sp.first, sp.second);
}
catch (Exception ex)
{
ExceptionHelper.ThrowIfFatal(ex);
InnerError(ex);
return;
}
}
}
if (Interlocked.Decrement(ref remaining) == 0)
{
var sp = Volatile.Read(ref current);
current = null;
if (sp != null)
{
Complete(sp.first);
}
else
{
Complete();
}
}
}
SlotPair AddValue(T value)
{
for (;;)
{
var c = Volatile.Read(ref current);
if (c == null)
{
c = new SlotPair();
if (Interlocked.CompareExchange(ref current, c, null) != null)
{
continue;
}
}
int slot = c.TryAcquireSlot();
if (slot < 0)
{
Interlocked.CompareExchange(ref current, null, c);
continue;
}
if (slot == 0)
{
c.first = value;
}
else
{
c.second = value;
}
if (c.ReleaseSlot())
{
Interlocked.CompareExchange(ref current, null, c);
return(c);
}
return(null);
}
}