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- Subject: Re: Patch for lua-5.2.0-beta-rc2
- From: François Perrad <francois.perrad@...>
- Date: Fri, 24 Jun 2011 17:57:48 +0200
2011/6/24 Roberto Ierusalimschy <firstname.lastname@example.org>:
>> a minor improvement/optimization of setpath().
> /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
> path = luaL_gsub(L, path, LUA_PATH_SEP LUA_PATH_SEP,
> LUA_PATH_SEP AUXMARK LUA_PATH_SEP);
> + lua_remove(L, -1);
> luaL_gsub(L, path, AUXMARK, def);
> - lua_remove(L, -2);
> This "improvement" seems to have a subtle bug. With the first remove,
> the string 'path' may not be anchored in Lua anymore. If the next gsub
> triggers some garbage-collection cycles, 'path' may be collected while
> still being used by gsub.
setpath is a static function called only by luaopen_package,
and the GC is stopped during the initialization of std libraries (in lua.c).
But an embedder could call luaL_openlibs without this precaution.
> -- Roberto