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[lwip-devel] [bug #49684] lwip_netconn_do_writemore(): non-blocking ERR_


From: Simon Goldschmidt
Subject: [lwip-devel] [bug #49684] lwip_netconn_do_writemore(): non-blocking ERR_MEM treated as failure
Date: Sat, 17 Dec 2016 20:38:18 -0000
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

Follow-up Comment #1, bug #49684 (project lwip):

The idea is good. I think we've had it before, but saw this problem:

ERR_MEM is a global problem (e.g. heap is empty). So you would have to mark
*all* netconns in this state as writable again when there is memory to consume
(if it was the heap, maybe it was "out of struct tcp_seg" in that pool, or out
of PBUF_REF for the nocopy case).

It might be marked as writable with the next call to poll_tcp() though, maybe
that's enough?

Keeping that aside, the patch should be good I think (i.e. it should handle
snd_buf/snd_queuelen limitations correctly).

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