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id XDVXQXAT; Sun, 19 Nov 2000 20:18:59 -0800
Date: Sun, 19 Nov 2000 21:20:24 -0800 (PST)
From: Rasoul Hajikhani <rhajikhani exchange office etoys com>
X-Sender: rhajikhani localhost localdomain
To: "DINH V. =?iso-8859-1?Q?Ho=E0?=" <dinh enserb fr>
cc: Juergen Boemmels <boemmels physik uni-kl de>,
gtk-list <gtk-list gnome org>
Subject: Re: passing args
In-Reply-To: <3A13296B A8A89CE5 enserb fr>
Message-ID: <Pine LNX 4 10 10011192117440 2040-100000 localhost localdomain>
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I say, I have done what you have said, that is I pass a reference to a=20
data structure an I get the following warning
interface.h:281: warning: passing arg 2 of `gtk_timeout_add' from
incompatible pointer type
and here is what I am doing:
timer =3D gtk_timeout_add (100, progress_timeout, hybrid);
where hybrid is a data structure...
so what's the deal...
-r
On Thu, 16 Nov 2000, DINH V. [iso-8859-1] Ho=E0 wrote:
> Juergen Boemmels wrote:
> >=20
> > "DINH V. Ho=E0" <dinh enserb fr> writes:
> >=20
> > > to call the function, you do the following :
> > >
> > > {
> > > struct struct_arg1_arg2 data;
> > > data->arg1 =3D arg1;
> > > data->arg2 =3D arg2;
> > > gtk_timeout_add(interval, function, &data);
> > > }
> >=20
> > I'm not sure, but this won't work.
> > You alloc the data on the stack, register a pointer to this, add leave
> > the function destroying this part of the stack. But it also may even
> > work in several cases. Those bugs are realy hard to find.
> >=20
> > When your timeout occurs, you may get a segfault, because the
> > stackframe is no longer valid.
> >=20
> > A possible way would be
> > {
> > struct struct_arg1_arg2 *data;
> >=20
> > data =3D malloc (sizeof (struct struct_arg1_arg2));
> > g_assert (data !=3D 0);
> > /* init data */
> > gtk_timeout_add (interval, function, &data);
> > }
> >=20
> > function (struct struct_arg1_arg2 *data)
> > {
> > /* do something with data */
> > free (data);
> > }
>=20
> ok, the way I gave won't work but yours won't work too.
>=20
> because, data will be freed as much as the function is called. (the
> function is called periodically with gtk_timeout_add).
>=20
> then the a better solution is=20
>=20
> {
> struct struct_arg1_arg2 *data;
> =20
> data =3D malloc (sizeof (struct struct_arg1_arg2));
> g_assert (data !=3D 0);
> /* init data */
> gtk_timeout_add (interval, function, &data);
> }
> =20
> function (struct struct_arg1_arg2 *data)
> {
> /* do something with data */
> // no free
> }
>=20
>=20
> don't forget to free the data at the end of the program or when the
> timeout
> callback will be stopped.
>=20
> --=20
> Hoa
>=20
> _______________________________________________
> gtk-list mailing list
> gtk-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-list
>=20