[lwip-devel] [task #7490] Add return value to sys_mbox_post

[Simon Goldschmidt]

Follow-up Comment #6, task #7490 (project lwip):

> I actually have a problem with this: I get the network packets 
> from an interrupt handler, which is not allowed to wait, and I've 
> currently no way to let the interrupt handler know that it 
> shouldn't call tcpip_input but just drop the packet. 

If not solving this with giving sys_mbox_post a return value, we could always
implement a counter that sets a limit on the packet-input mbox. That way,
sys_mbox_post can assert if the mbox is full.

I don't think waiting until there is free space in the mbox is the correct
implmementation: What if a UDP/TCP recv mbox is full but the application has
different things to do than receiving data? This would block the whole
tcpip_thread. So asserting should be the correct thing to do, but that can be
left out in a release build! :-(

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