Use the registry Luke... (and light userdata)
Setup the hook :
// Get in the registry a table with key=&my_hook (create it if needed)
lua_pushlightuserdata(L, &my_hook);
lua_gettable(L, LUA_REGISTRYINDEX);
if (lua_isnil(L, -1)) {
lua_newtable(L);
lua_pushvalue(L, -1);
lua_pushlightuserdata(L, &my_hook);
lua_settable(L, LUA_REGISTRYINDEX);
}
// Set entry with key=Current thread to starttime
lua_pushthread(L);
lua_pushnumber(L, starttime);
lua_settable(L, -3);
lua_sethook(L, my_hook, ...);
In the hook :
// Get the table for this hook
lua_pushlightuserdata(L, &my_hook);
lua_gettable(L, LUA_REGISTRYINDEX);
// Get the entry for this thread
lua_pushthread(L);
lua_gettable(L, -2);
// And get the startime value
starttime = lua_tonumber(L, -1);
Be carreful, this code wasn't tested, but I'm pretty sure you can found
errors in, but the idea is here...
Tom
On Mon, Oct 09, 2006 at 11:50:00PM +1000, David Burgess wrote:
> I was thinking of using lua_sethook() to call a function
> that checks how how much time has elapsed since the
> hook was set. I was intending to use this as a kill the
> thread when it has been running for too long. So I need
> to keep a start time variable e.g. time_t start = time();
>
> The lua_sethook() function does not let me pass this value
> so the only way I can store the start time is in Lua, I cant
> see how to store in C in a re-entrant(threadsafe) manner.
> I would like keep the time on the C side to save the table
> lookup on each hook call, Does anyone have a good way
> of doing this without using static or global variables or C++?
>
> And maybe in 5.2 could the prototype maybe be change from
>
> int lua_sethook (lua_State *L, lua_Hook func, int mask, int count);
>
> to
>
> int lua_sethook (lua_State *L, lua_Hook func, void* userdata, int
> mask, int count);
>
> have the hook function as
>
> typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar, void* userdata);
>
> Or is this change not required and is their an easier way to get
> C side data into a hook function?
>
> DB
--
Thomas Lavergne "Le vrai rêveur est celui qui rêve
de l'impossible." (Elsa Triolet)
thomas.lavergne@reveurs.org http://reveurs.org
