Re: [gnet] Question about gnet and g_main_loop_run

[Kostas Katsamakas <kmak ccf auth gr>]

Tim Müller wrote:

> On Thursday 21 July 2005 07:30, Kostas Katsamakas wrote:
>
>  
>
> > I am using gnet in a windows application. I create a thread which 
> > runs g_main_loop_run(); In my main application thread i create 
> > the server by calling  gnet_server_new().
> >
> > The problem is that nothing works if i create the server after
> > g_main_loop_run has been executed. It is important that i can 
> > create a server at any time, not only before g_main_loop()
> >
> > I have found a way to overcome this. If instead of calling
> > g_main_loop_run() in my second thread i call
> >
> > g_main_context_iteration (context, false); //See if any events to poll
> >
> > in a loop then everything works fine. The problem in this 
> > solution is active waiting. The cpu usage reaches 99% 
> >
> > I wonder if anyone could help me with this. I would like to be able
> > to create a new server anytime but still without the cpu usage cost.
> >    
>
> I'm not entirely sure I understand what you're doing, but here's how it should 
> work:
>
> GServer automatically adds a hook to the default GLib main context (context = 
> NULL) that makes sure everything works asynchroneously and non-blocking. This 
> only works if you're running a main loop (in the default context), like 
> gtk_main() for example.
>
> > From your description I take it that you are not running a main loop, and that 
> is why you create a thread where you do something like
>
>  while (stay_alive) {
>     g_main_context_iteration (NULL, false);
>  }
>
> ? That will definitively lead to 99% CPU usage. After all, if there's nothing 
> to do (which is almost always the case), it will return immediately, which 
> will check again right away, which ...
>
> Have you tried one of these:
>
>  while (stay_alive) {
>     g_main_context_iteration (NULL, true);
>  }
>
> which will block until something happens (downside: you need to explicitely 
> make it return when you unset stay_alive), or
>
>  while (stay_alive) {
>    while (stay_alive && g_main_context_pending (NULL)) {
>      g_main_context_iteration (NULL, false);
>    }
>    g_usleep (G_USEC_PER_SEC/20); /* sleep ca. 50ms */
>  }
>
> Cheers
> -Tim
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>  
Yes you are correct about me not running a main_loop. I instead use like 
you said something like this:

while (stay_alive) {
    g_main_context_iteration (NULL, false);
 }

The problem with the main loop was this. After i run the main loop
any gnet_server_new i create can't receive events (connect events don't come)

If i first create the server and then run the main loop then i can receive
new connections and error events on the server.

So i had to do something like the above code. I also tried

g_main_context_iteration (NULL, true);

but it behaves like the main loop, the events don't happen.

Can't find any way out of this. Perhaps i should try
creating the servers before the main loop runs. That sounds
too restrictive though.

Thanks again
Kostas