[Vala] Thread Support

[Daniel Espinosa <esodan gmail com>]

I'm using Vala 0.20.

I have an async function called directly in my code. When compiles I get
this:

XXXXXXX: warning: implicit .begin is deprecated

But when try this code:

Thread<void> th = new Thread<void>.try ("loading scl", () => {
            async_function (); /*Asinc function */
            return null;
          });
th.join ();

Error message is:

XXXXX: error: The name `try' does not exist in the context of `GLib.Thread'

I've checked glib-2.0.vapi, for both vala-0.20 and 0.22, that function is
present just for GLIB_2_32, checking my installed version I have a 2.40 on
a GNOME Ubuntu 14.04 box.

Then I don't find why this function is not present for the compiler, and
get warnings when try to use Thread<T>.create function.

Tutorials at Vala documentation is not too useful. If found usable your
comments, I can update that documenation for GLib 2.32 and above. Please
help me to improve that documentation.

-- 
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"de grano en grano, se hace la arena" (R) (en trámite, pero para los
cuates: LIBRE)