NDLI: Sleepy Sloth: Threads as Interrupts as Threads

Content Provider	IEEE Xplore Digital Library
Author	Hofer, W. Lohmann, D. Schröder-Preikschat, W.
Copyright Year	2011
Abstract	Event latency is considered to be one of the most important properties when selecting an event-driven real-time operating system. This is why in previous work on the Sloth kernel, we suggested treating threads as ISRs -- executing all application code in an interrupt context -- and thereby reducing event latencies by scheduling and dispatching solely in hardware. However, to achieve these benefits, Sloth does not support blocking threads or ISRs, but requires all control flows to have run-to-completion semantics. In this paper, we present Sleepy Sloth, an extension of Sloth that provides a new generalized thread abstraction that overcomes this limitation, while still letting the hardware do all scheduling and dispatching. Sleepy Sloth abolishes the (artificial) distinction between threads and ISRs: Threads can be dispatched as efficiently as interrupt handlers and interrupt handlers can be scheduled as flexibly as threads. Our Sleepy Sloth implementation of the automotive OSEK OS standard provides much more flexibility to application developers while maintaining efficient execution of application control flows. Sleepy Sloth runs on commodity off-the-shelf hardware and outperforms a leading commercial OSEK implementation by a factor of 1.3 to 19.
Starting Page	67
Ending Page	77
File Size	336637
Page Count	11
File Format	PDF
ISBN	9781457720000
ISSN	10528725
DOI	10.1109/RTSS.2011.14
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-29
Publisher Place	Austria
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Hardware Kernel Instruction sets Dispatching Context Message systems Blocking Threads Operating Systems Embedded Systems Real-Time Systems Thread Management Interrupt Handling OSEK Infineon TriCore Priority-Driven Scheduling
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Hardware and Architecture Software

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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