[lwip-devel] [bug #20021] conn->sem is only signaled one-way

[Simon Goldschmidt]

Follow-up Comment #12, bug #20021 (project lwip):

>No, the code on the api_msg side would change - the tcpip thread would not
block.

So if you move the send buffer test into api_msg (which is processed in
tcpip_thread), and there is no free buffer (or no mem), would you set a state
'someones_waiting' and signal the conn->sem? That would take away the race
condition of what I've suggested (only signal conn->sem if someone is waiting
for it).

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