Chinook Software Architecture Juha Tukkinen Juha Tukkinen / November 2007

Content Architecture overview logical process development Major components GNOME Mobile & maemo Differences to other OS’s

Architecture overview

logical

process

development

Major components

GNOME Mobile & maemo

Differences to other OS’s

Architecture overview

Architecture overview – logical view GNU/Linux X HAL GLib D-Bus core GTK+ Pango Cairo ATK Hildon Desktop Matchbox user interface Hildon Toolkit Applications Hildon plugins Sapwood GnomeVFS system services GConf GStreamer BlueZ E-D-S Telepathy LibConIC connectivity & communications Hildon Input Method

Architecture overview - logical 2

Architecture overview - multimedia

Architecture overview - processes processes run as user systemui nobody messagebus haldaemon root

processes run as

user

systemui

nobody

messagebus

haldaemon

root

Architecture overview - processes Important system software processes dsme – Device State Management Entity, a watchdog bme – Battery Management Entity mce – Mode Control (e.g. offline, device lock, leds) dbus-daemon – system&session, IPC for a desktop session, launches singleton applications, lifecycle tracking maemo-launcher – speeds up application startup

Important system software processes

dsme – Device State Management Entity, a watchdog

bme – Battery Management Entity

mce – Mode Control (e.g. offline, device lock, leds)

dbus-daemon – system&session, IPC for a desktop session, launches singleton applications, lifecycle tracking

maemo-launcher – speeds up application startup

Architecture overview - processes User interface server processes hildon-desktop hildon-input-method sapwood-server - theme engine matchbox-window-manager clipboard-manager

User interface server processes

hildon-desktop

hildon-input-method

sapwood-server - theme engine

matchbox-window-manager

clipboard-manager

Architecture overview – development view

Major components GNU/Linux X HAL GLib D-Bus core GTK+ Pango Cairo ATK Hildon Desktop Matchbox user interface Hildon Toolkit Applications Hildon plugins Sapwood GnomeVFS system services GConf GStreamer BlueZ E-D-S Telepathy LibConIC connectivity & communications Hildon Input Method

GNOME Mobile – prevent mobile Linux fragmentation

Differences to other mobile operating systems builds on existing open source desktop components all basic frameworks’ source code available applications do not need signing SDK open source development environment free software ITOS contains also closed parts

builds on existing open source desktop components

all basic frameworks’ source code available

applications do not need signing

SDK open source

development environment free software

ITOS contains also closed parts

Architecture overview - challenges Architecture heritage from GTK+ and GNOME Multiple APIs for the application developer Upstream APIs naturally change maemo specific APIs Documentation/API quality varies a lot Native application development language is C Not many available standards in mobile Linux … it is a hacker’s world both in good and bad!

Architecture heritage from GTK+ and GNOME

Multiple APIs for the application developer

Upstream APIs naturally change

maemo specific APIs

Documentation/API quality varies a lot

Native application development language is C

Not many available standards in mobile Linux

… it is a hacker’s world both in good and bad!

Architecture overview - achievements avoided “not invented here” largely same software components as in a normal GNU/Linux desktop maemo is an open embedded mobile platform embrace existing policies (e.g. Debian packaging) support existing de facto standards porting existing desktop software made easy

avoided “not invented here”

largely same software components as in a normal GNU/Linux desktop

maemo is an open embedded mobile platform

embrace existing policies (e.g. Debian packaging)

support existing de facto standards

porting existing desktop software made easy