U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

User-Level Shared Variables (In a Hierarchical Control Environment)

Published

Author(s)

Don E. Libes

Abstract

We have implemented a shared variable system for UNIX 4.2BSD that emulates a shared or common memory. This system is all user level code and requires no kernel modifications. It is accessible from a variety of languages. This shared memory system provides its service transparently to remote hosts across a local-area network. This system is being used in a real application--an automated factory. Shared variables are an appropriate communication paradigm in a real-time environment (in comparison to message passing or pipes).
Proceedings Title
Proceedings of the 1985 USENIX Conference
Pub Type
Conferences

Keywords

UNIX, shared variable system, memory, communication, real-time environment

Citation

Libes, D. (1985), User-Level Shared Variables (In a Hierarchical Control Environment), Proceedings of the 1985 USENIX Conference (Accessed May 9, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created January 1, 1985, Updated February 17, 2017