1. suggest that "run_loop_set_timer" function in "run_loop_posix.c" file rename to "posix_set_timer", and "run_loop_set_timer" function in "run_loop_embedded.c" file rename to "embedded_set_timer".
2. add "set_timer" function point into run_loop_t struct.
3. add "run_loop_set_timer" function into "run_loop.c" file, which can call "the_run_loop->set_timer(ts);".

Thanks for this suggestion. Fixed in r2094. I guess I was in a hurry and later forgot to clean up :)