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A2 (operating system)

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A2
DeveloperETH Zurich
OS familyOberon
Working stateCurrent
Source modelOpen source
Initial release2002; 23 years ago (2002)
Repository
PlatformsIA-32, x86-64, ARM, Cell
Kernel typeObject-oriented
LicenseBSD-like ETH A2 License[1]
Official websitegitlab.inf.ethz.ch/felixf/oberon

A2 (formerly named Active Object System (AOS),[2] and then Bluebottle) is a modular, object-oriented operating system with features including automatic garbage-collected memory management, and a zooming user interface. It was developed originally at ETH Zurich in 2002.[2] It is free and open-source software under a BSD-like license.

History

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A2 is a successor to Native Oberon, the x86 PC version of Niklaus Wirth's operating system Oberon.[3][4][5] It supports multiprocessing computers, and provides soft real-time computing operation. It is entirely written in Active Oberon.

A2's design allows developing efficient systems based on active objects which run directly on hardware, with no mediating interpreter or virtual machine. Active objects represent a combination of the traditional object-oriented programming (OOP) model of an object, combined with a thread that executes in the context of that object. In the Active Oberon implementation, an active object may include activity of its own, and of its ancestor objects.

The Oberon A2 desktop screen with the installer application open, along with a calendar and clock. (Using the default style)

A2 incorporates a minimalist design, implemented in a type-safe language with automatic memory management, combined with a set of primitives (at the level of programming language and runtime system) for synchronizing access to the internal properties of objects in competing execution contexts.

Above the kernel layer, A2 provides a set of modules providing unified abstractions for devices and services, such as file systems, user interfaces, computer network connections, media codecs, etc.

User interface

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Bluebottle replaced the older Oberon OS's unique text-based user interface (TUI) with a zooming user interface (ZUI), which similar to a conventional graphical user interface (GUI). Like Oberon, though, its user interface supports a point and click interface metaphor to execute commands directly from text, similar to clicking hyperlinks in a web browser.

See also

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References

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  1. ^ "License". Archived from the original on 7 August 2012. Retrieved 7 January 2014.
  2. ^ a b Muller, Pieter Johannes (2002). The active object system design and multiprocessor implementation (PDF) (PhD). Swiss Federal Institute of Technology, Zürich (ETH Zurich).
  3. ^ Wirth, Niklaus; Gutknecht, Jürg (September 1989). "The Oberon System". Software: Practice and Experience. 19 (9): 857–893. doi:10.1002/spe.4380190905. S2CID 44292990.
  4. ^ Reiser, Martin (1992). The Oberon System: User Guide and Programmer's Manual. Addison-Wesley. ISBN 0-201-54422-9.
  5. ^ Wirth, Niklaus; Gutknecht, Jürg (1992). Project Oberon: The Design of an Operating System and Compiler. Addison-Wesley. ISBN 978-0201544282. Out of print. Electronic reprint.
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Wikibooks has a book on the topic of: Oberon
Wikibooks has a book on the topic of: Oberon/A2
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