Re: [lwip-users] Could sys_restart_timeouts be provided also for !NO_SYS targets ?

[Ari Suutari]

Hi,

In my case sys_timeouts_mbox_fetch is not running when 

system sleeps. I have a function tcpipSuspend() which waits for

RTOS semaphore for tcp/ip stack to wake up. This function is

called with tcpip_callback_with_block, which makes the lwip stack

to “sleep” inside tcpip thread.

My project is  open source, see

https://github.com/AriZuu/emw-sensor/blob/master/main.c#L126

and

https://github.com/AriZuu/emw-sensor/blob/master/main.c#L250

Code has currently a kludgery workaround, it forcefully resets RTOS

‘jiffies’ after sleep, which is used by sys_now(), system works very well

with this.

I’ll enable sys_restart_timeouts and see if it works also, I think it should

because the effect should be same as my workaround.

    Ari S.

On 26 Sep 2016, at 21:20 , Sylvain Rochet <address@hidden> wrote:

Hi Ari,

On Mon, Sep 26, 2016 at 02:13:10PM +0300, Ari Suutari wrote:

Hi,

This related to http://savannah.nongnu.org/bugs/index.php?48568

I have a system which sleeps long times but sys_now() progresses during
sleep.
Currently this still seems to cause some surprises with timers.

While there seems to be discussion about moving to absolute time
in timers instead of current implementation, could it be possible that
timeouts.c provided
sys_restart_timeouts() function also for targets that are using RTOS in the
meantime ?

The problem here is that sys_timeouts_mbox_fetch() is still running when
you go to sleep, therefore calling sys_restart_timeouts() would do
nothing, this is why this function is currently not available in !NO_SYS
mode.

Anyway, could you try enabling sys_restart_timeouts() for !NO_SYS and
then calling it with tcpip_callback() to see what happen ? Theoretically
it should work but I'm not confident enough to certainly state there is
no corner case doing so.

(And yes, absolute timers does not have this problem ;)

Sylvain
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