public void Request(long n)
{
if (n <= 0L)
{
throw new ArgumentOutOfRangeException(nameof(n), "Positive request amount expected");
}
for (;;)
{
long r = Volatile.Read(ref requested);
if (r == long.MinValue)
{
break;
}
long u = r + n;
if (u < 0L)
{
u = long.MaxValue;
}
if (Interlocked.CompareExchange(ref requested, u, r) == r)
{
parent.Replay(this);
break;
}
}
}
