Well, I like and use SBCL and ECL, but I was curious if I could make something as big on my own. I was also curious about implementing that GC algorithm that I found in literature; I'm pretty satisfied with the result, though I don't exclude providing an alternative more classic GC as an option in the future.
I chose C because I love its clean design, and the portability of C89 can't really be matched.
About multi-threading: I still haven't thought about it much, but I'm optimistic; according to the paper, the algorithm is quite amenable to concurrency, since each object carries local information (the two refcounts), so some collection doesn't need global state. I agree, but we'll have to wait to see it in action
The size is indeed impressive (31 kSLOC, compared to e.g. Lua 5.1 with 13 kSLOC). I will have a closer look at the code. Maybe I can transpile it to my Luon language and run it on LuaJIT.
About multi-threading: I still haven't thought about it much, but I'm optimistic; according to the paper, the algorithm is quite amenable to concurrency, since each object carries local information (the two refcounts), so some collection doesn't need global state. I agree, but we'll have to wait to see it in action