I know this thread is over a year old but...didn't know where to post this. There also is no other posts regarding this RTOS on the forum it seems...
I'm wondering if anyone has tried Mark3 and gotten it working? I could really use this for my project I'm working on but when I get errors like:
sketch_oct15a.ino: In function 'int main()':
sketch_oct15a:17: error: no matching function for call to 'Thread::Init(uint8_t [192], int, int, void (&)(void*), int)'
thread.h:83: note: candidates are: void Thread::Init(uint32_t*, uint16_t, uint8_t, void ()(void), void*)
From the example you gave in this post it makes me wonder if getting this RTOS to work on an Arduino based Atmega328 is as trivial as you say it is.