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  1. Proceedings of the 5th symposium on Operating systems design and implementationCopyright restrictions prevent ACM from being able to make the PDFs for this conference available for downloading (OSDI '02)
  2. Luna: a flexible Java protection system
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Luna: a flexible Java protection system

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Luna: a flexible Java protection system

Content Provider ACM Digital Library
Author Hawblitzel, Chris von Eicken, Thorsten
Abstract Extensible Java systems face a difficult trade-off between sharing and protection. On one hand, Java's ability to run different protection domains in a single virtual machine enables domains to share data easily and communicate without address space switches. On the other hand, unrestricted sharing blurs the boundaries between protection domains, making it difficult to terminate domains and enforce restrictions on resource usage. Existing solutions to these problems restrict sharing in an ad-hoc fashion, ruling out many desirable programming styles.This paper presents an extension to Java's type system that systematically addresses the issues of data sharing, revocation, thread control, and resource control. Multiple tasks running in a single virtual machines share data using special remote pointers, which have different types from local pointers. The distinction between local and remote pointers allows the Java runtime system to mediate the communication between tasks without slowing down operations on ordinary pointers. The extensions to Java are implemented by a system called Luna, based on the Guavac and Marmot compilers, extended with special optimizations to support both fast inter-task communication and dynamic access control. The paper describes two applications written in Luna: a simple extensible web server, and an extension of the Squid web cache to support dynamic content generation.
Starting Page 391
Ending Page 401
Page Count 11
ISBN 9781450301114
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2002-12-09
Access Restriction Subscribed
Content Type Text
Resource Type Article
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