Function rcl_sys::rcl::timer::rcl_timer_get_time_since_last_call

pub unsafe extern "C" fn rcl_timer_get_time_since_last_call(
    timer: *const rcl_timer_t, 
    time_since_last_call: *mut i64
) -> rcl_ret_t

Retrieve the time since the previous call to rcl_timer_call() occurred.