Re: [lwip-users] Timers Question

[address@hidden]

@Younger: There is no function like 'main_thread' in the lwip source!

What you have to do is
a) provide a timeouts structure per thread, sys_arch_timeouts() must 
return a unique structure for the currently running thread
b) provide the correct wait-time return values for sys_arch_sem_wait() 
and sys_arch_mbox_fetch()

sys_sem_wait() and sys_mbox_fetch() will call the timeout handlers when 
enough time has passed waiting for semaphores/mboxes. The protocol 
timers are initialized in tcpip_init(), from v1.3.0 on you just have to 
call lwip_init().

The downside of this timer-approach is that timers are not really 
accurate when processor load is high in the tcpip_thread (active time 
vs. wait time) or if you never really wait much at all on sems/mboxes. 
There is a task on savannah for this to be implemented better (also for 
NO_SYS=1 which currently can't use the timeouts) but for now, this is 
how you have to do it.

Simon


John Kennedy wrote:
> Hi,
> I'm porting lwip using an RTOS and sockets, but I'm not certain what I have to 
> do about timers.
> Using an RTOS do I need to periodically call any timer functions within lwip 
> like etharp_tmr, tcp_tmr, dns_tmr, dhcp_coarse_tmr, dhcp_fine_tmr, 
> ip_reass_tmr, igmp_tmr, autoip_tmr?
>
> Thanks,
> John