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I've never written code with it, but the BSDs use these macros to implement rudimentary generic types in C: http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man3/.... Nice.

However, I've only had horrible experiences trying to read the BSDs' kernel code. There are way too many statements like "mst_fqd->f_do_skb((struct mfq_t *) q);"

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Yes! That's a really good implementations of linked lists using only preprocessor macros.

sys/queue.h is also provided in all Linux systems.

Easy to use, type-checked by the compiler and a lot faster than a "generic" linked list with pointers to the data. Here, the next/previous pointers get embedded in the payload struct itself.

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