[lwip-users] Timeout question

[Ivan Warren]

People,

I am implementing a "bare metal" (well not really, but that's not the 
point) system which is :

- non-preempting multithreaded (no other thread runs before a yield() or 
some waiting function)
- Single processor
- All "threads" run with interrupts disabled
- Interrupts have their own context

And

NO_SYS=1 on the lwip side.

There are multiple threads but only one (the "main" thread invokes LWIP 
functions), and any "application" is using the RAW api (and is/are in 
the main thread)

My questions are :

- How often should I invoke sys_check_timeouts() (every ms, every 10 ms, 
every second) - or (better) is there a way to determine (after any state 
change obviously) when the next timeout is due ?

- does sys_now/sys_jiffies have to be exactly milleseconds or would 
powers of 2 do ? (I have a microsecond counter and a 12 right shift 
would make a nice 1024 microseconds - making sys_now() sys_jiffies 
return the number of "1.024" ms... would that work ?)

Thanks,

--Ivan

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