Re: comparing Lua with other languages

[Daniel Quintela <dq@...>]

Philippe Lhoste escribió:

> Philippe Lhoste wrote:
>
> > Roberto Ierusalimschy wrote:
> >
> > > > Producer Consumer          - Needs threading
> > >
> > >
> > > Can't we use coroutines?
> >
> >
> > The test case writes about threads, but it wouldn't be the first time 
> > the rules be "abused"... :-)
> >
> > I still didn't get around the coroutines spirit :-<, so I am not sure 
> > I can do this myself. But I would be interested to see the result :-)
>
>
> Note: I think we can provide two implementations: one with pure Lua 
> coroutines, and another with, say, LuaThreads.
> Usage of external libraries is allowed in the rules.
My 2 cents from LuaTask universe:
-----------------------------------------------------------------
-- prodcom.lua
-- Producer/Consumer using LuaTask
-- Producer sends arg[1] messages to Consumer

if arg and arg[1] == 'Producer' then
   for i = 1, arg[3] do
       task.post( arg[2], string.format( 'Message %d', i), arg[3] - i)
   end
elseif arg and arg[1] == 'Consumer' then
   while true do
       local buf, flg, err = task.receive( -1)
       print( buf)
       if flg == 0 then
           task.post( arg[2], '', 0)
           break
      end
   end
else
   if not task then
       loadlib( 'task', 'luaopen_task')( )
   end
   task.create( 'prodcom.lua', { 'Producer', task.create( 
'prodcom.lua', { 'Consumer', task.id()}), arg[2] or 20})
   task.receive( -1)
end
-----------------------------------------------------------------