It would take me a bit of time to explain async (I've thought about blogging about it), but the short answer is: Vala's async and yield keywords are designed to use MainLoop to schedule code execution.
You don't *have* to use them to do asynchronous work, but they are certainly convenient. -- Jim On Mon, Oct 22, 2012 at 3:19 PM, rastersoft <[email protected]> wrote: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Yes, you are right: I created a main loop, called run(), and the callback got called. Anyway, I don't understand why is not possible to ensure that the end callback gets called even without a main loop :? Thanks! El 23/10/12 00:03, Jim Nelson escribió: > For async to work properly, you must run the GLib MainLoop. MainLoop is where your async closure for test_function.begin() is called. It's where all callbacks are scheduled, actually. > > The only reason this works is that in the case of DO_YIELD you stash the test_function.callback and then call it back. That's why you're seeing "End callback called 1". > > A better way to do this is to (a) get rid of ext_callback and (b) call "new GLib.MainLoop().run()" right before the "return 0" in main(). Without actually modifying the code (i.e. I'm doing this off the top of my head), that should work. > > -- Jim > > On Mon, Oct 22, 2012 at 2:47 PM, rastersoft <[email protected]> wrote: > > Hi all: > > I was working with async methods, and found something odd: if I call an > async method, but, for whatever reason, I never call YIELD inside, the > end callback function is never called. > > I attach an example: by compiling it with > > valac -D DO_YIELD -o test_async test_async.vala --pkg=gio-2.0 > > will do a YIELD inside the async function. But when compiled with > > valac -o test_async test_async.vala --pkg=gio-2.0 > > will not. In the former case you can see how "End callback called 1" is > printed, because the callback for the end is called; but in the later, > it's not printed. > > Is that a bug? If not, why does it work that way? > > Thanks. > > > > - -- Nos leemos RASTER (Linux user #228804) [email protected] http://www.rastersoft.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://www.enigmail.net/ iEYEARECAAYFAlCFxngACgkQXEZvyfy1ha/qbgCdEaOkBSyLpQFLgnldBkpo2v4C FlIAnRy2zdJBUIgC5IfgXbvKEcGg8wAv =OnLX -----END PGP SIGNATURE-----
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