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

[Jonathan Larmour]

Follow-up Comment #11, bug #20021 (project lwip):

> Might this cause a new set of problems where the tcpip_thread
> gets blocked waiting for memory to do operation A, while
> operation B that could otherwise go ahead isn't able to get into
> the tcpip_thread? The benefits might outweigh this downside
> though. Probably do in fact if there's an existing race that
> would also be solved. 

No, the code on the api_msg side would change - the tcpip thread would not
block. It would carry on, even if out of memory. It would release the waiting
thread in sent_tcp. It does not wait itself.



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