public bool TryRead(out Completion result)
{
uint head;
uint next;
uint tail;
do
{
head = Volatile.Read(ref *_head);
tail = *_tail;
if (head == tail)
{
result = default;
return(false);
}
next = unchecked (head + 1);
var index = head & _ringMask;
var cqe = &_cqes[index];
result = Completion.FromCqe(cqe);
} while (CompareExchange(ref *_head, next, head) != head);
// piggy-back on the read-barrier above to verify that we have no overflows
uint overflow = *_overflow;
if (overflow > 0)
{
ThrowOverflowException(overflow);
}
return(true);
}
private void PrepareCompletion(out Completion result, uint head)
{
var index = head & _ringMask;
var cqe = &_cqes[index];
result = Completion.FromCqe(cqe);
*_headInternal = unchecked (*_headInternal + 1);
}
