Batch recv / send?

[jeromegn]

Would it be possible to add methods for batch recv / send? The sending end doesn't bother me too much, but I wonder if there are optimizations available if the user specifically wants a batch (maybe less locking, maybe less syscalls?).

I don't nearly know enough to assess that. For now I am batching myself, but I do have to call try_recv() for every item.