
- this patch substitutes *xpp for sender to increase readability of mini_receive(). - makes sure that the dequeued sender has p_q_link == NULL and that this condition holds when enqueuing the sender again. - it is a sanity check to make sure that the new sender is not enqueued already. Before this change the dequeued sender's p_q_link may not be NULL and it was only set to NULL when enqueued again.
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