Lua C - 有没有办法在 C 中保留一个值，但仍然没有垃圾收集？

Question

I am creating a thread in lua c, but i want to keep it just in C, without making it a variable in the environment/etc. But when i throw away the thread value that gets pushed by lua_newthread, it gets garbace collected shortly after, and so becomes useless. In this thread i want to run arbitrary lua code passed by the user, allowing them to use the exclusive functions/variables that are isolated from other threads.

Is there a way to mark a thread/userdata/table value as non-garbage-collectable?

Answer 1

No, you have to reference it somewhere or disable GC. Use lua_ref to reference is in mostly-hidden place: registry. ( debug.getregistry() )

Answer 2

That is possible. You can add a call to gc_mark with your TValue's gcobj as an argument into gc_markroots.