Editing OSF/1 (section)

== OSF MK ==
The Open Software Foundation created OSF MK, an evolution of OSF/1, incorporating the OSF Mach kernel (or OSF Microkernel<ref name="wells1996">{{ cite journal | url=https://archive.org/details/proceedingsofwor0000work_y7j9/page/186/mode/2up | title=Using Object Frameworks to Enable Real-Time and Dependability in a Modular Operating System | journal=Proceedings of WORDS'96 The Second Workshop on Object-Oriented Real-Time Dependable Systems | last1=Wells | first1=Douglas M. | date=February 1996 | access-date=24 January 2024 | pages=186–190 }}</ref>) based on Mach 3.0 along with a variety of other functionality including the OSF/1 Single Server providing the Unix system personality. The complete system in the form of MK 5.0 was made available under commercial terms to OSF/1 licensees in April 1993.<ref name="wells1994" /> In contrast to the OSF/1 server, which was encumbered by proprietary Unix licensing, the microkernel itself remained freely available for adoption by other projects.<ref name="morin1997">{{ cite book | url=https://archive.org/details/mklinux00rich/page/143/mode/1up | title=MkLinux: Microkernel Linux for the Power Macintosh | publisher=Prime Time Freeware | date=1998 | access-date=24 January 2024 | isbn=1-881957-24-1 | last1=Morin | first1=Rich | pages=143 }}</ref> In OSF MK, it contains applicable code from the [[University of Utah]] Mach 4 kernel (such as the "Shuttles" modification used to speed up message passing) and applicable code from the many Mach 3.0 variants that sprouted off from the original [[Carnegie Mellon University]] Mach 3.0 kernel.<ref>Archived at [https://ghostarchive.org/varchive/youtube/20211212/ggnFoDqzGMU Ghostarchive]{{cbignore}} and the [https://web.archive.org/web/20181031185303/https://www.youtube.com/watch?v=ggnFoDqzGMU&gl=US&hl=en Wayback Machine]{{cbignore}}: {{cite AV media|url=https://www.youtube.com/watch?v=ggnFoDqzGMU|author=Jim Magee|title=WWDC 2000 Session 106 – Mac OS X: Kernel|minutes=12}}{{cbignore}}</ref><ref>{{cite web| url = http://www.db.opengroup.org/ar/technologies/mk-dbleplus/white_paper.htm| archive-url = https://web.archive.org/web/20170822055033/http://www.db.opengroup.org/ar/technologies/mk-dbleplus/white_paper.htm| archive-date = 2017-08-22 |url-status=dead| title = MK++: A High Performance, High Assurance Microkernel}}</ref> It also consists of improvements made by the OSF such as built-in collocation capability, realtime improvements, and rewriting of the [[Inter-process communication|IPC]] [[remote procedure call|RPC]] component for better performance.<ref name="wells1994">{{cite conference |url=https://pdfs.semanticscholar.org/03ac/1296f530719497b49d7580b55a2d9b8353ab.pdf|archive-url=https://web.archive.org/web/20170822053715/https://pdfs.semanticscholar.org/03ac/1296f530719497b49d7580b55a2d9b8353ab.pdf|archive-date=2017-08-22|url-status=dead|title=A Trusted, Scalable, Real-Time Operating System Environment |conference=1994 IEEE Dual-Use Technologies and Applications Conference |author=Douglas M. Wells|year=1994 |s2cid=5205380}}</ref>