RE: About lua_newthread

["Tom Miles" <Tom@...>]

Hi,

 

Sorry about the the thread necromancy, but I have just encountered this situation in the project I am currently working on.  I am running several threads from my main thread, all of which are just loaded with functions to call in an event based system.  At various intervals I want to "unload" these functions and load a new set, so I want to shut down the thread.  I therefore need to remove references to my thread from the stack as per the suggestion, however, when I iterate through the stack all that is on there is a userdata of indeterminate origin, not a thread.  (Having said that, I've just discovered that if I do lua_touserdata() and compare it to the address of the state returned with lua_newthread(), then they are the same, so I have found my thread - but there seems to be a little bug there as it isn't of type thread?).

 

On a similar note, is there a way of removing a non integer index from a table?  I use the thread as a key in a table to match it up to a game object, and when that object is destroyed I want to remove the entry in the table as well.

 

Thanks for any help.

 

Tom

 

 -----Original Message-----
From: lua-bounces@bazar2.conectiva.com.br [mailto:lua-bounces@bazar2.conectiva.com.br]On Behalf Of Raymond Jacobs
Sent: 18 May 2006 16:20
To: Lua list
Subject: Re: About lua_newthread

When you are done with a thread (when lua_resume returns and it's not a yield), you should remove the thread directly from the stack, this will remove the reference to it and it can then be garbage collected (its a pain I know =/).

 

another method which I've not yet done but should work, is to create a new thread, create a lua reference to it (using lua_ref) then pop it off the stack immediately (so it doesn't get buried), and later when you are done with it, destroy the reference (lua_unref) and that should allow it to be GC'd

 

hope that helps,

 

Raymond Jacobs

Owner,

Ethereal Darkness Interactive

 

On 5/18/06, mos <mmosquito@163.com> wrote:

Hi

in lua5.1 manual:

lua_newthread
         lua_State *lua_newthread (lua_State *L);
There is no explicit function to close or to destroy a thread. Threads are
subject to garbage collection, like any Lua object

       I don't understand this , for example like Npc in a game

       function AI()
               while(true) do
                       walkto(A)
                       walkto(B)
                       ...
                       walkto(Z)
               end
       end

       I bind each npc with a lua_State by lua_newthread

       but the npc will die and i should close the lua_State , but I can
not.
       what can I do ? or some better suggestion ?

Best Regards
mos