questions about test of lazy-linked-list

[ryuxin]

This is a great project, and I am learning your code now.
I have some questions about some code in the synchrobench/c-cpp/src/linkedlists/lazy-list/test.c
It has some code like this

#ifdef SIMPLE
	d->nb_add++;
#else
	if (ret != -2)
	{
		d->nb_add++;
	}
#endif

https://github.com/bitslab/ffwd/blob/master/synchrobench/c-cpp/src/linkedlists/lazy-list/test.c#L196-L203

1. What is the difference between the two cases? I did not see SIMPLE is defined anywhere.
2. In the else case, you check if ret is -2. However, I think the ret can never be -2, as you only return 0, 1, or -1. For example, some code here
   https://github.com/bitslab/ffwd/blob/master/synchrobench/c-cpp/src/linkedlists/lazy-list/ffwd_lazy.c#L92-L97

Thanks