View source for ChorusOS

{{Short description|Microkernel real-time operating system}}
{{More citations needed|date=November 2012}}
{{Use dmy dates|date=October 2021}}
{{Infobox OS
| name = ChorusOS
| logo = 
| screenshot = 
| caption = 
| developer = Chorus Systèmes<br />[[Sun Microsystems]]
| kernel type = [[Microkernel]] [[real-time operating system]]
| ui = 
| family = [[POSIX]]
| working state = Discontinued
| source model = Closed-source (pre-v5)<br />[[Open-source software|Open source]] (v5)
| released = {{Start date and age|1979}}<!-- If known, add |mm|dd|df=yes -->
| discontinued = <!-- DON'T use this for articles about releases of operating systems. -->
| latest release version = 5.1
| latest release date = {{Start date and age|2011}}<!-- If known, add |mm|dd|df=yes -->
| marketing target = [[Embedded system]]s
| programmed in = 
| language = English
| update model = 
| package manager = 
| supported platforms = [[x86]], [[Motorola 68000 series|680x0]], [[PowerPC]], [[SPARC]], [[ARM architecture|ARM]], [[MIPS architecture|MIPS]]
| license = 
| preceded by = 
| succeeded by = VirtualLogix C5
}}

'''ChorusOS''' is a [[microkernel]] [[real-time operating system]] designed as a [[message passing]] computing model. ChorusOS began as the Chorus [[Distributed operating system|distributed]] real-time [[operating system]] research project at the [[French Institute for Research in Computer Science and Automation]] (INRIA) in 1979.<ref name="CoulourisDollimoreKindberg1994">{{cite book |last1=Coulouris |first1=George |last2=Dollimore |first2=Jean |last3=Kindberg |first3=Tim |year=1994 |title=Distributed systems: concepts and design |publisher=Addison-Wesley |isbn=978-0-201-62433-5 |pages=[https://archive.org/details/distributedsyste00coul/page/566 566–79] |url=https://archive.org/details/distributedsyste00coul/page/566 |access-date=2 December 2012 }}</ref> During the 1980s, Chorus was one of two earliest microkernels (the other being [[Mach (kernel)|Mach]]) and was developed commercially by startup company [[Chorus Systèmes SA]].<ref name="Doeppner2010">{{cite book |last=Doeppner |first=Thomas W. |date=20 December 2010 |title=Operating Systems In Depth: Design and Programming |publisher=John Wiley & Sons |isbn=978-0-471-68723-8 |page=36,145 |url=https://books.google.com/books?id=xX5tfrAQQ8cC |access-date=29 November 2012}}</ref> Over time, development effort shifted away from distribution aspects to [[Real-time computing|real-time]] for [[embedded system]]s.<ref name="Michel Gien, 1995">{{cite conference |last=Gien |first=Michel |year=1995 |title=Evolution of the CHORUS Open Microkernel Architecture: The STREAM Project |conference=FTDCS '95 Proceedings of the 5th IEEE Workshop on Future Trends of Distributed Computing Systems |publisher=IEEE Computer Society |page=10 |url=http://dl.acm.org/citation.cfm?id=875713 |access-date=2 December 2012}}</ref>

In 1997, [[Sun Microsystems]] acquired Chorus Systèmes for its [[microkernel]] technology, which went toward the new [[JavaOS]].<ref name="Inside the JavaOS">{{cite book |last1=Saulpaugh |first1=Tom |last2=Mirho |first2=Charles |date=January 1999 |title=Inside the JavaOS Operating System |series=Java series |publisher=Addison-Wesley |isbn=0-201-18393-5 |oclc=924842439 |page=XIII |url=https://archive.org/details/insidejavaosoper00saul }}</ref> Sun (and henceforth Oracle) no longer supports ChorusOS. The founders of Chorus Systèmes started a new company called Jaluna in August 2002. Jaluna then became VirtualLogix, which was then acquired by Red Bend in September 2010. VirtualLogix designed [[embedded system]]s using [[Linux]] and ChorusOS (which they named ''VirtualLogix C5''). C5 was described by them as a [[carrier grade]] operating system, and was actively maintained by them.

The latest source tree of ChorusOS, an evolution of version 5.0, was released as [[open-source software]] by Sun and is available at the Sun Download Center.<ref>{{Cite web |url=https://cds.sun.com/is-bin/INTERSHOP.enfinity/WFS/CDS-CDS_SMI-Site/en_US/-/USD/ViewProductDetail-Start?ProductRef=ES-ChorusOS-5.0-G-F@CDS-CDS_SMI |title=Sun Download Center |website=Oracle |archive-url=https://archive.today/20111006194155/https://cds.sun.com/is-bin/INTERSHOP.enfinity/WFS/CDS-CDS_SMI-Site/en_US/-/USD/ViewProductDetail-Start?ProductRef=ES-ChorusOS-5.0-G-F@CDS-CDS_SMI |archive-date=6 October 2011 |url-status=dead}}</ref> The Jaluna project has completed these sources and published it online. Jaluna-1 is described there as a real-time Portable Operating System Interface (RT-[[POSIX]]) layer based on [[FreeBSD]] 4.1, and the CDE [[cross-platform software]] development environment. ChorusOS is supported by popular Secure Socket Layer and [[Transport Layer Security]] (SSL/TLS) [[Library (computing)|libraries]] such as [[wolfSSL]].

== See also ==
* [[JavaOS]]

==References==
{{Reflist}}



{{Distributed operating systems}}
{{Real-time operating systems}}
{{Microkernel}}

[[Category:Distributed operating systems]]
[[Category:French inventions]]
[[Category:Microkernel-based operating systems]]
[[Category:Microkernels]]
[[Category:Real-time operating systems]]
[[Category:Sun Microsystems software]]
[[Category:ARM operating systems]]
[[Category:X86 operating systems]]