Re: [gtk-list] Re: How to use a gpointer?

[Hrvoje Niksic <hniksic srce hr>]

john@giorgio.hart.bbk.ac.uk writes:

> dave@srce.hr wrote:
> >I've noticed that some functions have `guint32 time'
> >argument. I didn't check the sources, but I suppose that the OS and X
> >libraries handle this one as a time_t type.
> >Will this break a 64 bit GTK application?
> 
> It's the time field from an X event, so it's 32 bits.

Really?  Even in 64-bit environments?  That would be strange indeed.
If we're talking about the type that X calls `Time' (the type normally
used in X event structures, which Gtk "wisely" assigns to guint32),
then it's definitely 64-bit on 64-bit systems.

    #ifndef _XSERVER64
    [...]
    typedef unsigned long Time;
    #else
    [...]
    typedef CARD32 Time;
    #endif

This program prints 4 if compiled with `cc', and 8 if compiled with
`cc -xarch=v9'.

#include <stdio.h>
#include <X11/X.h>

main ()
{
  printf ("%d\n", sizeof (Time));
}

On Digital Unix it prints 4 unconditionally, which means that *any*
assumption on what the size of Time is will be wrong on one system or
the other.  The same stands true for most usages of Gtk+ g* types.