Hi zulu4711,
On Thu, Dec 21, 2017 at 03:06:14AM -0700, zulu4711 wrote: > > Yes, it seems like a threading violation like I had before and this is > surely because of me not having a full insight to what is legal to call and > what is not legal to call in the stack when running in threaded mode. > > I checked, and I called ppp_close() from another thread than I called > ppp_input() and I guess thats a big "no-no" ? Of course it is, almost all ppp_* functions are *NOT* thread safe. You have to use pppapi_* functions outside the lwIP core thread. While we are at it, I did not bother reading your code for correctness on this part, please check your PPP input function, only pppos_input_tcpip input method is thread safe. You really should read the PPP documentation. > It seems that 75% of the problems newcomers like myself is due to > threading problems. Because threading is hard, it is really, really hard. This is why each time you call a function you have to ask yourself whether you are allowed to call it in this context or not. On a more general note, that not necessarily apply here, before starting a project you should ask yourself whether a RTOS is actually necessary, generally it's not, from a not necessary at all to can be easily avoided range. Not using an RTOS makes everything an order of magnitude simpler, despite the overall belief of the contrary. Sylvain
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