self-removing timeouts

[Havoc Pennington <hp pobox com>]

Hi,

Hoping someone can enlighten me on timeouts a little. 

It seems that I can't remove a timeout from within the timeout:

#include <gtk--.h>
#include <iostream.h>

gint timeout;

gint iteration(gpointer data)
{
  static int num_iterations = 0;

  cerr << "Iteration...";
  ++num_iterations;

  if (num_iterations == 15) {
    cerr << "Stopping...";
    ((Gtk_Main *)data)->timeout_remove(timeout);
    // return false;  // this would work	
  }
  return true;
}

int main(int argc, char ** argv)
{
  Gtk_Main m(&argc, &argv);
  timeout = m.timeout_add(100, iteration, &m);
  m.run();
}

This just keeps on going forever, without so much as a
warning. Timeout removal works in testgtk, and the above program can
be made to work with a "return false," I think.

However, in my program the timeout sometimes causes a signal to be
emitted which calls a function to remove the timeout, so the return
false would have to happen via some roundabout mechanism.

Is returning false the only way to remove a timeout from within a
timeout? Is timeout_remove() explicitly disallowed from inside the
timeout? The tutorial makes it sound like "return false" is a
convenience thing and never required.

Thanks,

Havoc Pennington
http://pobox.com/~hp