OnlineWoerterBuecher.de - Lexikon, Free On-line Dictionary of Computing



	OnlineWoerterBuecher.de

Navigation

Start

Deutsch-Englisch

Deutsch-Spanisch

Enzyklopädie

Internes

Impressum

Kontakt

Lexikon

Multipop-68

An early href="module.php?name=Lexikon&file=search&eid=1&query=time-sharing">time-sharing href="module.php?name=Lexikon&file=search&eid=1&query=operating system">operating system developed in Edinburgh by Robin Popplestone and others. It was inspired by href="module.php?name=Lexikon&file=search&eid=1&query=MIT">MIT' href="module.php?name=Lexikon&file=search&eid=1&query=Project MAC">Project MAC, via a "MiniMac" project which was aborted when it became obvious that {Elliot Brothers} Ltd. could not supply the necessary disk storage. Multipop was highly efficient in its use of machine resources to support href="module.php?name=Lexikon&file=search&eid=1&query=symbolic programming">symbolic programming, and effective - e.g. in supporting the development of the href="module.php?name=Lexikon&file=search&eid=1&query=Boyer-Moore theorem prover">Boyer-Moore theorem prover and of Burstall and Darlington' s transformation work. It was not good at supporting the user programs which were then the standard fare of computing, e.g. matrix inversion. This arose from the fact that while the href="module.php?name=Lexikon&file=search&eid=1&query=POP-2">POP-2 compiler generated good code for function call (which is a lot of what layered systems like operating systems do) it did not generate efficient code for arithmetic or store access, because there was no way to police the generation of illegal objects statically. (href="module.php?name=Lexikon&file=search&eid=1&query=Hindley-Milner type">Hindley-Milner type checking did not exist). Indeed, since many OS features like file-access were performed by function-call (of a href="module.php?name=Lexikon&file=search&eid=1&query=closure">closure) rather than an OS call requiring a href="module.php?name=Lexikon&file=search&eid=1&query=context switch">context switch, POP-2 actually gained performance. Multipop68 was efficient primarily because the one language, POP-2 served all purposes: it was the command language for the operating system as well as being the only available programming language. Thus there was no need to swap in compilers etc. All store management was accomplished uniformly by the href="module.php?name=Lexikon&file=search&eid=1&query=garbage collector">garbage collector, as opposed to having store management for the OS and store management for each application. There was a substantial amount of href="module.php?name=Lexikon&file=search&eid=1&query=assembly language">assembly language in Multipop68. This was primarily for interrupt handling, and it is difficult to handle this without a href="module.php?name=Lexikon&file=search&eid=1&query=real-time">real-time garbage-collector. [Edited from a posting by Robin Popplestone]. (1995-03-15)

[ Go Back ]

Free On-line Dictionary of Computing

	All logos and trademarks in this site are property of their respective owner. Page Generation in 0.1043 Seconds, with 17 Database-Queries