Active Oberon is a general purpose

programming language A programming language is a system of notation for writing computer programs. Most programming languages are text-based formal languages, but they may also be graphical. They are a kind of computer language. The description of a programming ...

developed during 1996-1998 by the group around

Niklaus Wirth Niklaus Emil Wirth (born 15 February 1934) is a Swiss computer scientist. He has designed several programming languages, including Pascal (programming language), Pascal, and pioneered several classic topics in software engineering. In 1984, he w ...

and

Jürg Gutknecht Jürg Gutknecht (born 3 January 1949 in Bülach) is a Swiss computer scientist. He developed, with Niklaus Wirth, the programming language Oberon and the corresponding operating system Oberon. Biography Jürg Gutknecht was full professor in th ...

at the Swiss Federal Institute of Technology in Zürich (

ETH Zurich (colloquially) , former_name = eidgenössische polytechnische Schule , image = ETHZ.JPG , image_size = , established = , type = Public , budget = CHF 1.896 billion (2021) , rector = Günther Dissertori , president = Joël Mesot , ac ...

). It is an extension of the programming language

Oberon Oberon () is a king of the fairies in medieval and Renaissance literature. He is best known as a character in William Shakespeare's play ''A Midsummer Night's Dream'', in which he is King of the Fairies and spouse of Titania, Queen of the Fair ...

. The extensions aim at implementing active

objects Object may refer to: General meanings * Object (philosophy), a thing, being, or concept ** Object (abstract), an object which does not exist at any particular time or place ** Physical object, an identifiable collection of matter * Goal, an ...

as expressions for parallelism. Compared to its predecessors, Oberon and

Oberon-2 Oberon-2 is an extension of the original Oberon programming language that adds limited reflection and object-oriented programming facilities, open arrays as pointer base types, read-only field export, and reintroduces the FOR loop from Modula-2. ...

, Active Oberon adds objects (with object-centered access protection and local activity control), system-guarded assertions, preemptive priority scheduling and a changed

syntax In linguistics, syntax () is the study of how words and morphemes combine to form larger units such as phrases and sentences. Central concerns of syntax include word order, grammatical relations, hierarchical sentence structure ( constituency) ...

for

methods Method ( grc, μέθοδος, methodos) literally means a pursuit of knowledge, investigation, mode of prosecuting such inquiry, or system. In recent centuries it more often means a prescribed process for completing a task. It may refer to: *Scien ...

(named '' type-bound procedures'' in Oberon vocabulary). Objects may be ''active'', which means that they may be threads or processes. The operating system named ''Active Object System'' (AOS) in 2002, then due to trademark issues, renamed ''Bluebottle'' in 2005, and then renamed '' A2'' in 2008, especially the kernel, synchronizes and coordinates different active objects. Unlike

Java Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's List ...

or C#, objects may be synchronized not only with

signals In signal processing, a signal is a function that conveys information about a phenomenon. Any quantity that can vary over space or time can be used as a signal to share messages between observers. The ''IEEE Transactions on Signal Processing'' ...

but directly on conditions. This simplifies concurrent programs and their development. An Active Oberon

fork In cutlery or kitchenware, a fork (from la, furca 'pitchfork') is a utensil, now usually made of metal, whose long handle terminates in a head that branches into several narrow and often slightly curved tines with which one can spear foods ei ...

is the language

Zonnon Zonnon is a general purpose programming language in the line or family of the preceding languages Pascal, Modula, and Oberon. Jürg Gutknecht is the author. Its conceptual model is based on objects, definitions, implementations, and modules. Its ...

References

External links

ETH Oberon (2019) Language Report

A2 Operating System & Active Oberon community in Telegram

A2 user guide and applications description
* Archiv
Language Report
{{Authority control Class-based programming languages Modula programming language family Object-oriented programming languages Procedural programming languages Oberon programming language family Systems programming languages

See also

References

External links