Re: [luabind] Another GC bug

[Daniel W. <dal...@st...>]

Thanks for reporting this. I don't think we will be able to take a look
at this before the holidays, so it'll take a while.

Tom Spilman wrote:
>   It seems I've found another GC leak from Luabind.  Here is the simple
> test case:
> 
>   -- main.cpp --
> 
> extern "C" {
> 	#include <lua.h>
> 	#include <lualib.h>
> 	#include <lauxlib.h>
> }
> #include <luabind\luabind.hpp>
> #include <luabind\object.hpp>
> 
> 
> void fast_update( luabind::object self )
> {
> 	// This call leaks memory to the 
> 	// GC that is not collected until
> 	// lua_close()
> 	self[ "_value" ] = 10;
> }
> 
> 
> int main( int argc, char* argv[] )
> {
> 	// Setup lua
> 	lua_State* L = lua_open();
> 	luaopen_base( L );
> 	luaopen_table( L );
> 	
> 	// Startup luabind!
> 	luabind::open( L );
> 
> 	// Expose our fast update function to the script.
> 	luabind::function( L, "fast_update", &fast_update );
> 
> 	// Execute the lua script which does 
> 	// the rest of the test.
> 	lua_dofile( L, "main.lua" );
> 
> 	// Cleanup.
> 	lua_close( L );
> 	
> 	return 0;
> }
> 
> 
>   -- main.lua --
> 
> class 'object'
> 
> function object:__init()
> 
> 	self._value = 0
> 
> end
> 
> function object:update()
> 	
> 	self._value = 10
> 
> end
> 
> -- *** If I overload update to call my
> -- *** 'C' fast update the GC will start
> -- *** to grow fairly fast.  Uncomment
> -- *** this line to see the bug.
> -- object.update = fast_update
> 
> my_object = object()
> 
> while true do
> 
> 	my_object:update()
> 
> 	print( "memory use = " .. gcinfo() )
> 
> end
> 
>   ----
> 
>   This was tested with Lua 5.0.1 and a snapshot of Luabind from last
> week.
> 
> 	Tom
> 
>   
> 
> 	
> 
> 	
> 
> 	
> 
> 
> 
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-- 
Daniel Wallin