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Use of pushglobaltable and setfenv in Lua5.3

2016-11-17 18:04 459 查看

Use
of pushglobaltable and setfenv in Lua5.3

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how to get luathread function with same function name in diffent luathreads in Lua 5.3? use getglobal in 5.1 work sucess, but under 5.3 work error,

this code is main run call luathread functions

const char * gLua0 = "function Test() print(12) end";
const char * gLua1 = "function Test() print(23) end";

lua_State * sL0 = newLuaThread();
luaL_loadbuffer(sL0, gLua0, strlen(gLua0), nullptr);

lua_State * sL1 = newLuaThread();
luaL_loadbuffer(sL1, gLua1, strlen(gLua1), nullptr);

lua_getglobal(sL0, "Test");
lua_pcall(sL0, 0, 0, 0);

lua_getglobal(sL1, "Test");
lua_pcall(sL1, 0, 0, 0);

//---- result of lua 5.1

12

23

//----- result of lua 5.3

23

23

why result 5.3 is diffent from 5.1?

this code is create lua thread in lua 5.1

lua_State * newLuaThread()
{
lua_State * sL = lua_newthread(L);

lua_pushvalue(L, -1);
int nRef = luaL_ref(L, LUA_REGISTRYINDEX);

lua_newtable(L);
lua_pushvalue(L, -1);
lua_setmetatable(L, -2);

lua_pushvalue(L, LUA_GLOBALSINDEX);
lua_setfield(L, -2, "__index");

lua_setfenv(L, -2);

lua_pop(L, 1);
return sL;
}

this code is create lua thread in lua 5.3

lua_State * newLuaThread()
{
lua_State * sL = lua_newthread(L);

lua_pushvalue(L, -1);
int nRef = luaL_ref(L, LUA_REGISTRYINDEX);

lua_newtable(nLuaState);
lua_pushvalue(nLuaState, -1);
lua_setmetatable(nLuaState, -2);

lua_getglobal(nLuaState, "_G");
lua_setfield(nLuaState, -2, "__index");

lua_setupvalue(nLuaState, 1, 1);

lua_pop(L, 1);
return sL;
}

c++ lua

shareimprove
this question

edited May
5 '15 at 4:17

asked May 4 '15 at 10:13

冷冷爱
163

setuservalue

doesn't
replace the use of function environments it replaces the user of userdata environments. The replacement for function environments in lua 5.2+ is

_ENV

. – Etan
Reisner May
4 '15 at 11:22

thank you! i spend more time on setupvalue, but also not work – 冷冷爱 May
5 '15 at 2:51

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1 Answer

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spend 5 days find the correct answer is:

luaL_loadbuffer(nLuaState, nBuffer, strlen(nBuffer), nullptr);

lua_newtable(nLuaState);
lua_pushvalue(nLuaState, -1);
lua_setmetatable(nLuaState, -2);

lua_getglobal(nLuaState, "_G");
lua_setfield(nLuaState, -2, "__index");

lua_pushvalue(nLuaState, -1);
lua_setglobal(nLuaState, nChunk);

lua_setupvalue(nLuaState, -2, 1);

lua_getglobal(nLuaState, nChunk);
lua_getfield(nLuaState, -1, nFun);
lua_pcall(nLuaState, 0, 0, 0);

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Use of pushglobaltable and setfenv in Lua5.3

Useof pushglobaltable and setfenv in Lua5.3

1 Answer

Use
of pushglobaltable and setfenv in Lua5.3