is it possible to obtain the lua state during a call from lua to c++ function via luabind?

consider i have such a function in c++:
luabind::object cppfunction()
{
  lua_State* l; //i need a lua state here which invoking this function.

  luabind::object table = luabind::newtable(l);
  table[1]="asdfjkl;";
  return table;
}

and it was registered to lua:
module(l)
[
  def("cppfunction",&cppfunction)
];

now how do i obtain the state in my cpp function?is it possible?
i can not use a singleton luastate,because i need more than one states
running parallel.

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