Re: [lwip-users] Multi-Threaded netconn API TCP application

[Darius Babrauskas]

Hi, Sylvain

> > Hi Darius,
> On Thu, Sep 24, 2015 at 10:36:02AM +0300, Darius Babrauskas wrote:
> > About systimeouts I found her(old info):
> > http://lwip.wikia.com/wiki/Porting_for_an_OS

> This is very outdated, sys_arch_timeouts() is not needed anymore circa
> 2011.


> > Its my opinion, because some year ago my experience was not
> > successful with linux port (works but unstable) .
> >
> > In current linux  port I have a sighting in function "cond_wait"
> > which using gettimeofday:
> > We have depends to system time adjustments (ntp, user ...)
> > Maybe better solution use CLOCK_MONOTONIC...

> You are right, CLOCK_REALTIME (the gettimeofday() timing source) is not
> a nice timing source to get elapsed time, the port is now using
> CLOCK_MONOTONIC. However I doubt that having used CLOCK_REALTIME instead
> of CLOCK_MONOTONIC was enough to qualify the whole port as being
> miswritten.
Of course, not whole port.

> Why didn't you propose a patch when you noticed that several years ago ?

Maybe, not was supported the Linux port. Strange, that gettimeofday 
CLOCK_REALTIME was used long time.
This can damage the test results. Exmp. NTP client can change systemtime at 
each half hour, some seconds, when your testing LWIP.

> Sylvain