Re: [OT] Re: [MM] [PATCH v2] iface-modem, novatel-lte: disable network scan in LTE mode
> >> You cannot mix in the same async method a code execution path using >> mm_base_modem_at_command() with another one using GSimpleAsyncResult and >> completion in idle. When you use mm_base_modem_at_command(), in >> finish() you're expected to use mm_base_modem_at_command_finish(), like >> you did. But when you use GSimpleAsyncResult and completion in idle you >> should use g_simple_async_result_propagate_error() in finish(). The fact >> that it may work as expected is due to how at_command_finish() is >> implemented; but you shouldn't rely on that. >> >> So you'll need to use GSimpleAsyncResult for both cases, i.e. provide a >> _ready() GAsyncReadyCallback in mm_base_modem_at_command() to which you >> pass 'simple' as user_data; and then complete the 'simple' from within >> the _ready() method. In this way, you can safely call >> g_simple_async_result_propagate_error() in finish(). > > Offtopic, but do you know where this is documented? Any books, online > docs or api docs to recommend? Is it part of gnome/glibs, or dbus? > If you mean the overall GSimpleAsyncResult behaviour; I guess the reference is still the GLib/GIO API documentation: http://developer.gnome.org/gio/unstable/GSimpleAsyncResult.html But note that for new code, GTask is the new better and cleaner GSimpleAsyncResult replacement: http://developer.gnome.org/gio/unstable/GTask.html There's no manual or tutorial just talking about async GIO functions, AFAIK, I guess you just end up getting used to it... -- Aleksander ___ networkmanager-list mailing list networkmanager-list@gnome.org https://mail.gnome.org/mailman/listinfo/networkmanager-list
[OT] Re: [MM] [PATCH v2] iface-modem,novatel-lte: disable network scan in LTE mode
On Jan 4, 2013 12:58 AM, "Aleksander Morgado" wrote: > You cannot mix in the same async method a code execution path using > mm_base_modem_at_command() with another one using GSimpleAsyncResult and > completion in idle. When you use mm_base_modem_at_command(), in > finish() you're expected to use mm_base_modem_at_command_finish(), like > you did. But when you use GSimpleAsyncResult and completion in idle you > should use g_simple_async_result_propagate_error() in finish(). The fact > that it may work as expected is due to how at_command_finish() is > implemented; but you shouldn't rely on that. > > So you'll need to use GSimpleAsyncResult for both cases, i.e. provide a > _ready() GAsyncReadyCallback in mm_base_modem_at_command() to which you > pass 'simple' as user_data; and then complete the 'simple' from within > the _ready() method. In this way, you can safely call > g_simple_async_result_propagate_error() in finish(). Offtopic, but do you know where this is documented? Any books, online docs or api docs to recommend? Is it part of gnome/glibs, or dbus? -- Marius ___ networkmanager-list mailing list networkmanager-list@gnome.org https://mail.gnome.org/mailman/listinfo/networkmanager-list
Re: [MM] [PATCH v2] iface-modem, novatel-lte: disable network scan in LTE mode
Thanks for the notes. Submitted patch v3.
- Ben
On Thu, Jan 3, 2013 at 3:58 PM, Aleksander Morgado wrote:
>
> > +static GList *
> > +scan_networks_finish (MMIfaceModem3gpp *self,
> > + GAsyncResult *res,
> > + GError **error)
> > +{
> > +const gchar *result;
> > +
> > +result = mm_base_modem_at_command_finish (MM_BASE_MODEM (self),
> res, error);
> > +if (!result)
> > +return NULL;
> > +
> > +return mm_3gpp_parse_cops_test_response (result, error);
> > +}
> > +
> > +static void
> > +scan_networks (MMIfaceModem3gpp *self,
> > + GAsyncReadyCallback callback,
> > + gpointer user_data)
> > +{
> > +MMModemAccessTechnology access_tech;
> > +
> > +mm_dbg ("scanning for networks (Novatel LTE)...");
> > +
> > +access_tech = mm_iface_modem_get_access_technologies
> (MM_IFACE_MODEM (self));
> > +/* The Novatel LTE modem does not properly support AT+COPS=? in LTE
> mode.
> > + * Thus, do not try to scan networks when the current access
> technologies
> > + * include LTE.
> > + */
> > +if (access_tech & MM_MODEM_ACCESS_TECHNOLOGY_LTE) {
> > +GSimpleAsyncResult *simple;
> > +gchar *access_tech_string;
> > +
> > +access_tech_string =
> mm_modem_access_technology_build_string_from_mask (access_tech);
> > +mm_warn ("Couldn't scan for networks with access technologies:
> %s", access_tech_string);
> > +simple = g_simple_async_result_new (G_OBJECT (self),
> > +callback,
> > +user_data,
> > +scan_networks);
> > +g_simple_async_result_set_error (simple,
> > + MM_CORE_ERROR,
> > + MM_CORE_ERROR_UNSUPPORTED,
> > + "Couldn't scan for networks
> with access technologies: %s",
> > + access_tech_string);
> > +g_simple_async_result_complete_in_idle (simple);
> > +g_object_unref (simple);
> > +g_free (access_tech_string);
> > +return;
> > +}
> > +
> > +mm_base_modem_at_command (MM_BASE_MODEM (self),
> > + "+COPS=?",
> > + 120,
> > + FALSE,
> > + callback,
> > + user_data);
> > +}
>
> You cannot mix in the same async method a code execution path using
> mm_base_modem_at_command() with another one using GSimpleAsyncResult and
> completion in idle. When you use mm_base_modem_at_command(), in
> finish() you're expected to use mm_base_modem_at_command_finish(), like
> you did. But when you use GSimpleAsyncResult and completion in idle you
> should use g_simple_async_result_propagate_error() in finish(). The fact
> that it may work as expected is due to how at_command_finish() is
> implemented; but you shouldn't rely on that.
>
> So you'll need to use GSimpleAsyncResult for both cases, i.e. provide a
> _ready() GAsyncReadyCallback in mm_base_modem_at_command() to which you
> pass 'simple' as user_data; and then complete the 'simple' from within
> the _ready() method. In this way, you can safely call
> g_simple_async_result_propagate_error() in finish().
>
> See for example:
>
> http://cgit.freedesktop.org/ModemManager/ModemManager/tree/plugins/simtech/mm-broadband-modem-simtech.c#n416
>
> And btw, a hint for when you just always need to report an error in idle
> in the async method (avoids the need to create a GSimpleAsyncResult
> yourself):
>
> http://developer.gnome.org/gio/unstable/GSimpleAsyncResult.html#g-simple-async-report-error-in-idle
>
> --
> Aleksander
>
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Re: [MM] [PATCH v2] iface-modem,novatel-lte: disable network scan in LTE mode
> +static GList *
> +scan_networks_finish (MMIfaceModem3gpp *self,
> + GAsyncResult *res,
> + GError **error)
> +{
> +const gchar *result;
> +
> +result = mm_base_modem_at_command_finish (MM_BASE_MODEM (self), res,
> error);
> +if (!result)
> +return NULL;
> +
> +return mm_3gpp_parse_cops_test_response (result, error);
> +}
> +
> +static void
> +scan_networks (MMIfaceModem3gpp *self,
> + GAsyncReadyCallback callback,
> + gpointer user_data)
> +{
> +MMModemAccessTechnology access_tech;
> +
> +mm_dbg ("scanning for networks (Novatel LTE)...");
> +
> +access_tech = mm_iface_modem_get_access_technologies (MM_IFACE_MODEM
> (self));
> +/* The Novatel LTE modem does not properly support AT+COPS=? in LTE mode.
> + * Thus, do not try to scan networks when the current access technologies
> + * include LTE.
> + */
> +if (access_tech & MM_MODEM_ACCESS_TECHNOLOGY_LTE) {
> +GSimpleAsyncResult *simple;
> +gchar *access_tech_string;
> +
> +access_tech_string =
> mm_modem_access_technology_build_string_from_mask (access_tech);
> +mm_warn ("Couldn't scan for networks with access technologies: %s",
> access_tech_string);
> +simple = g_simple_async_result_new (G_OBJECT (self),
> +callback,
> +user_data,
> +scan_networks);
> +g_simple_async_result_set_error (simple,
> + MM_CORE_ERROR,
> + MM_CORE_ERROR_UNSUPPORTED,
> + "Couldn't scan for networks with
> access technologies: %s",
> + access_tech_string);
> +g_simple_async_result_complete_in_idle (simple);
> +g_object_unref (simple);
> +g_free (access_tech_string);
> +return;
> +}
> +
> +mm_base_modem_at_command (MM_BASE_MODEM (self),
> + "+COPS=?",
> + 120,
> + FALSE,
> + callback,
> + user_data);
> +}
You cannot mix in the same async method a code execution path using
mm_base_modem_at_command() with another one using GSimpleAsyncResult and
completion in idle. When you use mm_base_modem_at_command(), in
finish() you're expected to use mm_base_modem_at_command_finish(), like
you did. But when you use GSimpleAsyncResult and completion in idle you
should use g_simple_async_result_propagate_error() in finish(). The fact
that it may work as expected is due to how at_command_finish() is
implemented; but you shouldn't rely on that.
So you'll need to use GSimpleAsyncResult for both cases, i.e. provide a
_ready() GAsyncReadyCallback in mm_base_modem_at_command() to which you
pass 'simple' as user_data; and then complete the 'simple' from within
the _ready() method. In this way, you can safely call
g_simple_async_result_propagate_error() in finish().
See for example:
http://cgit.freedesktop.org/ModemManager/ModemManager/tree/plugins/simtech/mm-broadband-modem-simtech.c#n416
And btw, a hint for when you just always need to report an error in idle
in the async method (avoids the need to create a GSimpleAsyncResult
yourself):
http://developer.gnome.org/gio/unstable/GSimpleAsyncResult.html#g-simple-async-report-error-in-idle
--
Aleksander
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