pub unsafe extern "C" fn rcl_wait_set_add_guard_condition(
wait_set: *mut rcl_wait_set_t,
guard_condition: *const rcl_guard_condition_t,
index: *mut usize,
) -> rcl_ret_t
pub unsafe extern "C" fn rcl_wait_set_add_guard_condition(
wait_set: *mut rcl_wait_set_t,
guard_condition: *const rcl_guard_condition_t,
index: *mut usize,
) -> rcl_ret_t