Run a callback by GTask from an extension

[Géza Búza <bghome gmail com>]

Hi everybody,

I run into an issue while developing an extension for Gnome Shell.
Long running _javascript_ code can make the whole Gnome Shell unresponsive for a second. Since I cannot reduce the execution time of the long running code, I want to move it out of the main loop's thread to a new one to make the UI update independent. I found that the best way would be to create a GTask to run my synchronous JS code asynchronously.

So I tried something like this:

let task = imports.gi.Gio.Task.new(
    Lang.bind(this, function(){ /* do the heavy work */ }),
    null,
    Lang.bind(this, function(){ /* handle the result when ready */ }),
);

But that does not work, because the first argument is not a GObject, but a JS function.

I think that a passing a GClosure instead could work. Here is how I tries to instantiate it:

let closure = new imports.gi.GObject.Closure(function(){}, new imports.gi.GObject.Object);

Unfortunately this does not work either, probably the first argument has to be a GCallback.

Can I get some assistance?

Thanks in advance.

Regards,
Geza

--

Üdvözlettel,

Búza Géza