Re: Recalculation of timeouts with g_timeout_add

[Pascal Bonfils <bonfils mcsi-tech com>]

I haven't tried to pass the timeout value but what do is with a global 
variable.

Imagine that you have the reference of the timeout, as a global variable :
   guint TimeOut_Ref;

then you have a first call to your callback function
   TimeOut_Ref = g_timeout_add (20*1000, callback, (gpointer)&timeout);

you stop the timeout just when you enter the function :
   gboolean callback (gpointer data) {
       if (TimeOut_Ref > 0) {
           g_source_remove(TimeOut_Ref);
           TimeOut_Ref = 0;
           }
       ....
Then, at the end of you called function, just before the return, you 
reactivate the timeout :
       .....
       TimeOut_Ref = g_timeout_add (20*1000, callback, (gpointer)&timeout);
        return TRUE;
   }


Regards

Pascal


Mitko Haralanov a écrit :
> I have a question about g_timeout_add's timeout recalculation.
>
> Currently, the next call time is calculated based on <time of callback
> thread start> + <timeout given to g_timeout_add>. This means that if I
> call g_timeout_add with a timeout of 20*1000 msecs (20 seconds) and my
> callback takes 10 seconds to complete, my callback will be called 10
> seconds after it completes. Here is an example:
>
> #include <gtk/gtk.h>
> #include <glib.h>
> #include <time.h>
> #include <stdio.h>
>
> gboolean callback (gpointer data) {
>      int timeout = *((int *)data);
>      printf ("callback called at: %lu\n", time (NULL));
>      sleep (timeout);
>      printf ("callback returns at: %lu\n", time (NULL));
>      return TRUE;
> }
>
> int main (int argc, char **argv) {
>      int timeout = 10;
>      gtk_init (&argc, &argv);
>      g_timeout_add (20*1000, callback, (gpointer)&timeout);
>      gtk_main ();
> }
>
>
> will produce this:
> callback called at: 1210893003
> callback returns at: 1210893013
> callback called at: 1210893023
> callback returns at: 1210893033
> callback called at: 1210893043
>
> What I would to happen is that my callback is called 20 seconds after
> it returns, not 20 seconds after it is started.
>
> How can I accomplish this?
>
>