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- Subject: Re: Weak tables and userdata finalization
- From: Gregory Bonik <gregory@...>
- Date: Tue, 06 Sep 2011 00:14:46 +0400
> hi, mark & Gregory ~
> maybe i have the similar problem with you..
> i also use a weak table to save the map between c++ object address to
> its lua table,
> every c++ object is represented as a lua table, whose array part
> element is a userdata for saving the c++ object's address,
> and the __gc method for the userdata is set for calling the object's
> ref-counter decrease
> at most time it goes well, but if i adjust the gc parameter "setpause"
> to a little value, some strange crash would happen, and the dump looks
> like a memory corrupt.
> i have no much knownodge about lua gc, so what's your conclusion for
> the problem? is my c++ bind solution correct ?
The solution is to clear the corresponding entry in the weak table
manually in the __gc metamethod right before you decrease the reference
count, i. e. your __gc should look like that:
int gc(lua_State* L)
Object* obj = *(Object**)lua_touserdata(L, 1);
lua_getfield(L, LUA_REGISTRYINDEX, "map");