Re: How to add a callback that will be called each time when the event queue becomes empty

[Patrick Ohly <patrick ohly intel com>]

On Sat, 2013-07-20 at 04:14 +0800, Gang Chen wrote:
> Because the idle callback always returns TRUE, the idle callback is
> called again and again, and CPU usage is 100%.
>
> The idle callback doesn't do any heavy processing.
>
>
> Regarding this problem, doing central updating when idle is simpler
> than using signals to update.

In the thread that normally runs g_main_loop_run(), use instead:

   while (<keep running>) {
       g_main_context_iteration(NULL, TRUE); /* block */
       <your idle code here>
   }

Because g_main_context_iteration() is allowed to block when there is
nothing to do, you avoid the 100% CPU consumption. If there was
something to do, your code gets called.

-- 
Best Regards, Patrick Ohly

The content of this message is my personal opinion only and although
I am an employee of Intel, the statements I make here in no way
represent Intel's position on the issue, nor am I authorized to speak
on behalf of Intel on this matter.