Task Communication in DEMOS

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Author

F. Baskett,J.H. Howard,J.T. Montague

Entry type

inproceedings

Abstract

This paper describes the fundamentals and some of the details of task commincation in DEMCS, the operating system for the CRAY-1 computer being developed at the Los Alamos Scientific Laboratory. The communication mech- anism is a message system with several novel features. Meesages are sent from one task to another over links. Links are the primary protected objects in the system; they provide messages paths and optional data sharing between tasks. They can be used to represent other objects with capability-like ac- cess controls. Links point to the tasks that created them. A task that creates a link determines its contents and possibly restricts its use. A link may be passed on from on task to another along with a message sent over some other link suject to the restrictions imposed by the creatorof the link be- ing passed. The link based message and sata sharing system is an attractive alternative to semaphore or monitor type shared variable based operating system on machines with only very simple memory protection mechanisms or on machines connected together in a network.

Date

1977 – November

URL

http://portal.acm.org/citation.cfm?id=806544

Address

Los Alamos, NM 87545

Institution

Association for Computing Machinery

Journal

Proceedings of the Sixth ACM Symposium on Operating System Principles

Key alpha

Baskett

Pages

23-31

Publication Date

2001-01-01

BibTex-formatted data

To refer to this entry, you may select and copy the text below and paste it into your BibTex document. Note that the text may not contain all macros that BibTex supports.

@Inproceedings{ Baskett,
	title = "Task Communication in DEMOS",
	author = "F. Baskett,J.H. Howard,J.T. Montague",
	year = "1977",
	month = "November",
	address = "Los Alamos, NM 87545",
	institution = "Association for Computing Machinery",
	journal = "Proceedings of the Sixth ACM Symposium on Operating System Principles",
	pages = "23-31",
	abstract = "This paper describes the fundamentals and some of the details of task
commincation in DEMCS, the operating system for the CRAY-1 computer being
developed at the Los Alamos Scientific Laboratory. The communication mech-
anism is a message system with several novel features. Meesages are sent
from one task to another over links. Links are the primary protected objects
in the system; they provide messages paths and optional data sharing between
tasks. They can be used to represent other objects with capability-like ac-
cess controls. Links point to the tasks that created them. A task that creates
a link determines its contents and possibly restricts its use. A link may
be passed on from on task to another along with a message sent over some
other link suject to the restrictions imposed by the creatorof the link be-
ing passed. The link based message and sata sharing system is an attractive
alternative to semaphore or monitor type shared variable based operating
system on machines with only very simple memory protection mechanisms or on
machines connected together in a network.",
	url = "http://portal.acm.org/citation.cfm?id=806544",
}