Re: 5.3w2 Continuation changes: Tutorial?

[Philipp Janda <siffiejoe@...>]

Hi!

Am 30.06.2014 20:04 schröbte Andrew Starks:
> I read through the changes in the C API. Beyond the tutorials in PiL, I
> made any yield-able C function, in real life.
>
> Is there anyone out there that wants to look at the changes in 5.3w2 and
> write up a small tutorial / example?
>
> The goal would be to provide some context for these changes.

Not much has changed since Lua 5.2: The `lua_getctx` function is gone 
now, and the two values it returned (status and context) are passed to 
the continuation functions directly. As a consequence continuation 
functions get a new prototype with two extra parameters. And that's it.

If you look at the implementation of `pcall` in the Lua 5.2 source[1], 
you will see the `pcallcont` function whose only job is to call 
`lua_getctx` and pass status (and optionally context) to `finishpcall`. 
Most C functions using `lua_pcallk` had this structure, so with the new 
prototypes `pcallcont`-like helper functions become unnecessary.

> Thanks!
>
> -Andrew

HTH,
Philipp

  [1]: http://www.lua.org/source/5.2/lbaselib.c.html#luaB_pcall