So I decided to use lua "threads" which are supposed to be Lua coroutines in C, they don't crash when I use the C api from there. The problem is that the lua threads are bound to their main lua state, and loading/unloading modules becomes a problem.
I need to create a separate Lua state (via luaL_newstate) and link it to the running Lua state, so it'd be able to have a different registry/reference table.
I did change the lua thread's running environment from
Long ass code I'm using for the C API
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local LuaLib = ffi.load("lua51") ffi.cdef [[ 	enum { 	/* option for multiple returns in `lua_pcall' and `lua_call' */ 		LUA_MULTRET = (-1), 	/* pseudo-indices */ 		LUA_REGISTRYINDEX = (-10000), 		LUA_ENVIRONINDEX = (-10001), 		LUA_GLOBALSINDEX = (-10002), 	/* thread status; 0 is OK */ 		LUA_YIELD = 1, 		LUA_ERRRUN = 2, 		LUA_ERRSYNTAX = 3, 		LUA_ERRMEM = 4, 		LUA_ERRERR = 5, 	/* basic types */ 		LUA_TNONE = (-1), 		LUA_TNIL = 0, 		LUA_TBOOLEAN = 1, 		LUA_TLIGHTUSERDATA = 2, 		LUA_TNUMBER = 3, 		LUA_TSTRING = 4, 		LUA_TTABLE = 5, 		LUA_TFUNCTION = 6, 		LUA_TUSERDATA = 7, 		LUA_TTHREAD = 8, 	/* minimum Lua stack available to a C function */ 		LUA_MINSTACK = 20, 	/* garbage collection options */ 		LUA_GCSTOP = 0, 		LUA_GCRESTART = 1, 		LUA_GCCOLLECT = 2, 		LUA_GCCOUNT = 3, 		LUA_GCCOUNTB = 4, 		LUA_GCSTEP = 5, 		LUA_GCSETPAUSE = 6, 		LUA_GCSETSTEPMUL = 7, 	/* Event codes */ 		LUA_HOOKCALL = 0, 		LUA_HOOKRET = 1, 		LUA_HOOKLINE = 2, 		LUA_HOOKCOUNT = 3, 		LUA_HOOKTAILRET = 4, 	/* Event masks */ 		LUA_MASKCALL = (1 << LUA_HOOKCALL), 		LUA_MASKRET = (1 << LUA_HOOKRET), 		LUA_MASKLINE = (1 << LUA_HOOKLINE), 		LUA_MASKCOUNT = (1 << LUA_HOOKCOUNT), 	}; 	 	/* type of numbers in Lua */ 	typedef double lua_Number; 	/* type for integer functions */ 	typedef ptrdiff_t lua_Integer; 	 	typedef union GCObject GCObject; 	 	typedef union { 		GCObject * gc; 		void * p; 		lua_Number n; 		int b; 	} Value; 	 	typedef struct lua_TValue { 		Value value; 		int tt; 	} TValue; 	 	typedef struct Table { 		struct Table *metatable; 		TValue *array; /* array part */ 		GCObject *gclist; 		int sizearray; /* size of `array' array */ 	} Table; 	 	typedef struct global_State { 		void * ud; /* auxiliary data to `frealloc' */ 		struct lua_State * mainthread; 	} global_State; 	typedef struct lua_State { 		struct global_State * l_G; 		TValue * l_gt; 		TValue * env; 		GCObject * openupval; /* list of open upvalues in this stack */ 		GCObject * gclist; 	} lua_State; 	 	typedef int (*lua_CFunction) (lua_State *L); 	/* functions that read/write blocks when loading/dumping Lua chunks */ 	typedef const char * (*lua_Reader) (lua_State *L, void *ud, size_t *sz); 	typedef int (*lua_Writer) (lua_State *L, const void* p, size_t sz, void* ud); 	/* prototype for memory-allocation functions */ 	typedef void * (*lua_Alloc) (void *ud, void *ptr, size_t osize, size_t nsize); 	/* state manipulation */ 	lua_State *(lua_newstate) (lua_Alloc f, void *ud); 	void (lua_close) (lua_State *L); 	lua_State *(lua_newthread) (lua_State *L); 	lua_CFunction (lua_atpanic) (lua_State *L, lua_CFunction panicf); 	/* basic stack manipulation */ 	int (lua_gettop) (lua_State *L); 	void (lua_settop) (lua_State *L, int idx); 	void (lua_pushvalue) (lua_State *L, int idx); 	void (lua_remove) (lua_State *L, int idx); 	void (lua_insert) (lua_State *L, int idx); 	void (lua_replace) (lua_State *L, int idx); 	int (lua_checkstack) (lua_State *L, int sz); 	void (lua_xmove) (lua_State *from, lua_State *to, int n); 	/* access functions (stack -> C) */ 	int (lua_isnumber) (lua_State *L, int idx); 	int (lua_isstring) (lua_State *L, int idx); 	int (lua_iscfunction) (lua_State *L, int idx); 	int (lua_isuserdata) (lua_State *L, int idx); 	int (lua_type) (lua_State *L, int idx); 	const char *(lua_typename) (lua_State *L, int tp); 	int (lua_equal) (lua_State *L, int idx1, int idx2); 	int (lua_rawequal) (lua_State *L, int idx1, int idx2); 	int (lua_lessthan) (lua_State *L, int idx1, int idx2); 	lua_Number (lua_tonumber) (lua_State *L, int idx); 	lua_Integer (lua_tointeger) (lua_State *L, int idx); 	int (lua_toboolean) (lua_State *L, int idx); 	const char *(lua_tolstring) (lua_State *L, int idx, size_t *len); 	size_t (lua_objlen) (lua_State *L, int idx); 	lua_CFunction (lua_tocfunction) (lua_State *L, int idx); 	void	 *(lua_touserdata) (lua_State *L, int idx); 	lua_State *(lua_tothread) (lua_State *L, int idx); 	const void *(lua_topointer) (lua_State *L, int idx); 	/* push functions (C -> stack) */ 	void (lua_pushnil) (lua_State *L); 	void (lua_pushnumber) (lua_State *L, lua_Number n); 	void (lua_pushinteger) (lua_State *L, lua_Integer n); 	void (lua_pushlstring) (lua_State *L, const char *s, size_t l); 	void (lua_pushstring) (lua_State *L, const char *s); 	const char *(lua_pushvfstring) (lua_State *L, const char *fmt, 																			va_list argp); 	const char *(lua_pushfstring) (lua_State *L, const char *fmt, ...); 	void (lua_pushcclosure) (lua_State *L, lua_CFunction fn, int n); 	void (lua_pop) (lua_State *L, int n); 	void (lua_pushboolean) (lua_State *L, int b); 	void (lua_pushlightuserdata) (lua_State *L, void *p); 	int (lua_pushthread) (lua_State *L); 	/* get functions (Lua -> stack) */ 	void (lua_gettable) (lua_State *L, int idx); 	void (lua_getfield) (lua_State *L, int idx, const char *k); 	void (lua_rawget) (lua_State *L, int idx); 	void (lua_rawgeti) (lua_State *L, int idx, int n); 	void (lua_createtable) (lua_State *L, int narr, int nrec); 	void *(lua_newuserdata) (lua_State *L, size_t sz); 	int (lua_getmetatable) (lua_State *L, int objindex); 	void (lua_getfenv) (lua_State *L, int idx); 	/* set functions (stack -> Lua) */ 	void (lua_settable) (lua_State *L, int idx); 	void (lua_setfield) (lua_State *L, int idx, const char *k); 	void (lua_rawset) (lua_State *L, int idx); 	void (lua_rawseti) (lua_State *L, int idx, int n); 	int (lua_setmetatable) (lua_State *L, int objindex); 	int (lua_setfenv) (lua_State *L, int idx); 	/* `load' and `call' functions (load and run Lua code) */ 	void (lua_call) (lua_State *L, int nargs, int nresults); 	int (lua_pcall) (lua_State *L, int nargs, int nresults, int errfunc); 	int (lua_cpcall) (lua_State *L, lua_CFunction func, void *ud); 	int (lua_load) (lua_State *L, lua_Reader reader, void *dt, 														 const char *chunkname); 	int (lua_dump) (lua_State *L, lua_Writer writer, void *data); 	/* coroutine functions */ 	int (lua_yield) (lua_State *L, int nresults); 	int (lua_resume) (lua_State *L, int narg); 	int (lua_status) (lua_State *L); 	/* garbage-collection function */ 	int (lua_gc) (lua_State *L, int what, int data); 	/* miscellaneous functions */ 	int (lua_error) (lua_State *L); 	int (lua_next) (lua_State *L, int idx); 	void (lua_concat) (lua_State *L, int n); 	lua_Alloc (lua_getallocf) (lua_State *L, void **ud); 	void lua_setallocf (lua_State *L, lua_Alloc f, void *ud); 	/* hack */ 	void lua_setlevel	(lua_State *from, lua_State *to); 	/* Debug API */ 	typedef struct lua_Debug lua_Debug; /* activation record */ 	/* Functions to be called by the debuger in specific events */ 	typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar); 	int lua_getstack (lua_State *L, int level, lua_Debug *ar); 	int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar); 	const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n); 	const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n); 	const char *lua_getupvalue (lua_State *L, int funcindex, int n); 	const char *lua_setupvalue (lua_State *L, int funcindex, int n); 	int lua_sethook (lua_State *L, lua_Hook func, int mask, int count); 	lua_Hook lua_gethook (lua_State *L); 	int lua_gethookmask (lua_State *L); 	int lua_gethookcount (lua_State *L); 	struct lua_Debug { 	 int event; 	 const char *name;	/* (n) */ 	 const char *namewhat;	/* (n) `global', `local', `field', `method' */ 	 const char *what;	/* (S) `Lua', `C', `main', `tail' */ 	 const char *source;	/* (S) */ 	 int currentline;	/* (l) */ 	 int nups;		/* (u) number of upvalues */ 	 int linedefined;	/* (S) */ 	 int lastlinedefined;	/* (S) */ 	 char short_src[60]; /* (S) */ 	 /* private part */ 	 int i_ci; /* active function */ 	}; 	/* lauxlib.h ------------------------------------------------------ */ 	enum { 	/* extra error code for `luaL_load' */ 		LUA_ERRFILE = (LUA_ERRERR+1), 	/* pre-defined references */ 		LUA_NOREF = (-2), 		LUA_REFNIL = (-1), 	}; 	typedef struct luaL_Reg { 	 const char *name; 	 lua_CFunction func; 	} luaL_Reg; 	void (luaI_openlib) (lua_State *L, const char *libname, 											 const luaL_Reg *l, int nup); 	void (luaL_register) (lua_State *L, const char *libname, 											 const luaL_Reg *l); 	int (luaL_getmetafield) (lua_State *L, int obj, const char *e); 	int (luaL_callmeta) (lua_State *L, int obj, const char *e); 	int (luaL_typerror) (lua_State *L, int narg, const char *tname); 	int (luaL_argerror) (lua_State *L, int numarg, const char *extramsg); 	const char *(luaL_checklstring) (lua_State *L, int numArg, 																				 size_t *l); 	const char *(luaL_optlstring) (lua_State *L, int numArg, 															const char *def, size_t *l); 	lua_Number (luaL_checknumber) (lua_State *L, int numArg); 	lua_Number (luaL_optnumber) (lua_State *L, int nArg, lua_Number def); 	lua_Integer (luaL_checkinteger) (lua_State *L, int numArg); 	lua_Integer (luaL_optinteger) (lua_State *L, int nArg, 															lua_Integer def); 	void (luaL_checkstack) (lua_State *L, int sz, const char *msg); 	void (luaL_checktype) (lua_State *L, int narg, int t); 	void (luaL_checkany) (lua_State *L, int narg); 	int (luaL_newmetatable) (lua_State *L, const char *tname); 	void *(luaL_checkudata) (lua_State *L, int ud, const char *tname); 	void (luaL_where) (lua_State *L, int lvl); 	int (luaL_error) (lua_State *L, const char *fmt, ...); 	int (luaL_checkoption) (lua_State *L, int narg, const char *def, 												 const char *const lst[]); 	int (luaL_ref) (lua_State *L, int t); 	void (luaL_unref) (lua_State *L, int t, int ref); 	int (luaL_loadfile) (lua_State *L, const char *filename); 	int (luaL_loadbuffer) (lua_State *L, const char *buff, size_t sz, 												 const char *name); 	int (luaL_loadstring) (lua_State *L, const char *s); 	lua_State *(luaL_newstate) (void); 	const char *(luaL_gsub) (lua_State *L, const char *s, const char *p, 																	 const char *r); 	const char *(luaL_findtable) (lua_State *L, int idx, 														 const char *fname, int szhint); 	/* Generic Buffer manipulation */ 	typedef struct luaL_Buffer { 	 char *p;	/* current position in buffer */ 	 int lvl; /* number of strings in the stack (level) */ 	 lua_State *L; 	 char buffer[?]; 	} luaL_Buffer; 	void (luaL_buffinit) (lua_State *L, luaL_Buffer *B); 	char *(luaL_prepbuffer) (luaL_Buffer *B); 	void (luaL_addlstring) (luaL_Buffer *B, const char *s, size_t l); 	void (luaL_addstring) (luaL_Buffer *B, const char *s); 	void (luaL_addvalue) (luaL_Buffer *B); 	void (luaL_pushresult) (luaL_Buffer *B); 	/* lualib.h -------------------------------------------------------- */ 	int (luaopen_base) (lua_State *L); 	int (luaopen_table) (lua_State *L); 	int (luaopen_io) (lua_State *L); 	int (luaopen_os) (lua_State *L); 	int (luaopen_string) (lua_State *L); 	int (luaopen_math) (lua_State *L); 	int (luaopen_debug) (lua_State *L); 	int (luaopen_package) (lua_State *L); 	/* open all previous libraries */ 	void (luaL_openlibs) (lua_State *L); 	 	typedef struct CType { uint32_t info; uint32_t size; uint16_t sib; uint16_t next; uint32_t name; } CType; 	typedef struct CTState { CType *tab; uint32_t top; uint32_t sizetab; lua_State *L; lua_State *g; void *finalizer; 		void *miscmap; } CTState; ]] lua = setmetatable({}, {__index = LuaLib}) function lua.luaL_dostring(L, string) 	lua.luaL_loadstring(L, string) 	return tonumber(lua.lua_pcall(L, 0, lua.LUA_MULTRET, 0)) end function lua.luaL_dofile(L, file) 	lua.luaL_loadfile(L, file) 	return tonumber(lua.lua_pcall(L, 0, lua.LUA_MULTRET, 0)) end function lua.lua_geterror(L) 	return ffi.string(lua.lua_tostring(L, -1)) end function lua.lua_getglobal(L, name) 	lua.lua_getfield(L, lua.LUA_GLOBALSINDEX, name) end function lua.lua_pushcfunction(L, f) 	return lua.lua_pushcclosure(L, f, 0) end function lua.lua_tostring(L, Index) 	return lua.lua_tolstring(L, Index, nil) end function lua.lua_newtable(L) 	return lua.lua_createtable(L, 0, 0) end local function MemPtr(gcobj) return tonumber(tostring(gcobj):match"%x*$", 16) end function lua.lua_newlocalthread() 	local CTState 	local Coroutine = coroutine.create(function () end) 	local MemoryPointer = MemPtr(Coroutine) 	local Cast = ffi.cast("uint32_t *", MemoryPointer) 	local G = ffi.cast("uint32_t *", Cast[2]) 	 	local IndexCast = ffi.cast("const char *", "__index") 	local Anchor = ffi.cast("uint32_t", IndexCast) 	local i = 0 	while math.abs(tonumber(G[i] - Anchor)) > 64 do 		i = i + 1 	end 	repeat 		i = i - 1 		CTState = ffi.cast("CTState *", G[i]) 	until ffi.cast("uint32_t *", CTState.g) == G 	return lua.lua_newthread(CTState.L) end
The code I'm using to change the state's environment
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local TempThread = lua.lua_newlocalthread() State = lua.luaL_newstate() State.l_gt = TempThread.l_gt State.env = TempThread.env
The error I'm getting:
PANIC: unprotected error in call to Lua API (attempt to index a nil value)
Basically I didn't change the state's running environment in the correct way (please don't argue that I'm not using the standard Lua API for this, I already tried and it's useless) (and don't ask me why I'm doing this, it's for my own purposes).
Any help?