GC incmode

[skaller <skaller@...>]

Roberto: I may have missed something, but ..

This function:

void luaC_step (lua_State *L) {

would in fact handle incremental behaviour with this fragment

  } while (lim > 0 || !g->incgc);

however a grep on the source reveals this function and
indeed luaC_fullgc are never called except in lua_gc.

lua_gc in turn is only called by collectgarbage with
an appropriate flag.

I can't see how it can work if it isn't called.

The step function should be called on every memory
allocation shouldn't it?

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