[lwip-devel] [bug #23240] recv_udp increases counters for available receives before netbuf is actually posted

[Daphne]

Follow-up Comment #9, bug #23240 (project lwip):

hi, all. 
I'm a new comer of lwip. I also have this bug in our embedded system, so I
trace the code.

I'm wondering whether using a buf linked-list for each netconn help.
sys_mbox_trypost() is just used for synchronization, not for passing buf
pointer. Since if sys_mbox_trypost() fails, the code has to free the
buf(netbuf_delete()), and this wastes CPU resource (we copy the data from
driver, but have no chance to process it).  

Besides, in my opinion, sys_mbox_trypost() fail probably results from mbox
full, so it might be good to keep the buf.

How do you think?
(Sorry for my bad English.)

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