GTK+ Application: Receive input from a worker thread

Question

I have a GTK+ application with a GtkTextBuffer. It uses several worker threads which perform some lengthy operations. Those threads can report their progress in a textual format. I want to show details on how a worker thread is performing. Can you please tell me how to receive input from a worker thread?

I thought that I can emit a signal "insert-text" from the worker thread, but cannot find a relevant example while googling. Any help is much appreciated.

An example of how to fire a signal from a worker thread. Am I allowed to do that? — Teo Ubuntu
– Teo Ubuntu, Commented Dec 21, 2011 at 15:27
It's the same as emitting a signal from the main thread - g_signal_emit() or g_signal_emit_by_name(). The signal handler is called from the main thread with the GDK lock held. — ptomato
– ptomato, Commented Dec 21, 2011 at 20:30
@ptomato, are you sure g_signal_emit lock is handler by Gtk ? if that's right, then what he says should do it. — erick2red
– erick2red, Commented Dec 25, 2011 at 2:10
@erick2red It works for me. I didn't understand the OP's question to mean that it didn't work, just that he/she couldn't find an example. — ptomato
– ptomato, Commented Dec 25, 2011 at 14:13

erick2red · Accepted Answer · 2011-12-19 17:00:37Z

1

You could use GAsyncQueue for messaging between your UI and your workers thread, it is a very finished API for communication.

answered Dec 19, 2011 at 17:00

erick2red

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Teo Ubuntu Over a year ago

I had a look at the API (thanks for suggesting that). However, it is not obvious to me how to push signals through the main loop. Puling for them (either by means of a timer or an idle processing) is inefficient. I just would like to get informed when something interesting has happened. That's why I thought about firing signals from the worker threads.

Eugen Rieck · Accepted Answer · 2011-12-18 19:15:14Z

Classic quick and dirty: Write your status updates to a linked list (protected by some sync primitive), have the GTK main loop poll it via a timer.

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