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Maemo Chinook Software Architecture

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The document provides an overview of the Chinook software architecture. It describes the major components which include GNU/Linux, X, GLib, D-Bus, GTK+, Pango, Cairo, ATK, Hildon Desktop, Matchbox, Hildon Toolkit, GnomeVFS, GConf, GStreamer, BlueZ, E-D-S, Telepathy, LibConIC. It also discusses the logical and development views of the architecture, differences from other mobile operating systems, and challenges and achievements of the architecture.

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

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Maemo Chinook Software Architecture

  • 1. Chinook Software Architecture Juha Tukkinen Juha Tukkinen / November 2007
  • 2. Content Architecture overview logical process development Major components GNOME Mobile & maemo Differences to other OS¨s
  • 4. Architecture overview C 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
  • 6. Architecture overview - multimedia
  • 7. Architecture overview - processes processes run as user systemui nobody messagebus haldaemon root
  • 8. ?
  • 9. Architecture overview - processes Important system software processes dsme C Device State Management Entity, a watchdog bme C Battery Management Entity mce C Mode Control (e.g. offline, device lock, leds) dbus-daemon C system&session, IPC for a desktop session, launches singleton applications, lifecycle tracking maemo-launcher C speeds up application startup
  • 10. Architecture overview - processes User interface server processes hildon-desktop hildon-input-method sapwood-server - theme engine matchbox-window-manager clipboard-manager
  • 11. Architecture overview C development view
  • 12. 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
  • 13. GNOME Mobile C prevent mobile Linux fragmentation
  • 14. 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
  • 15. 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!
  • 16. 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