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

[Jonathan Larmour]

Follow-up Comment #15, task #7490 (project lwip):

I just realised that while I said it's up to the caller to decide what to do
if the call fails, blocking is difficult. Unless you always accompany an mbox
by a semaphore, there's no way for the caller to block waiting for space to
appear in the mbox.

So I think as per Frederic's comment #10, having two functions, sys_mbox_post
(which blocks) and sys_mbox_trypost (which doesn't, and instead returns an
error code as needed), and the caller can choose which behaviour they want.
Since it is likely the implementations of these functions are mostly the same
code (either in sys_arch or the OS) this shouldn't be that bad for code
space.



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