NDLI: TOSThreads: thread-safe and non-invasive preemption in TinyOS

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ADB: an efficient multihop broadcast protocol based on asynchronous duty-cycling in wireless sensor networks

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TOSThreads: thread-safe and non-invasive preemption in TinyOS

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TOSThreads: thread-safe and non-invasive preemption in TinyOS

Content Provider	ACM Digital Library
Author	Klues, Kevin Terzis, Andreas Paek, Jeongyeup Musăloiu-E, Răzvan Govindan, Ramesh Levis, Philip Liang, Chieh-Jan Mike
Abstract	Many threads packages have been proposed for programming wireless sensor platforms. However, many sensor network operating systems still choose to provide an event-driven model, due to efficiency concerns. We present TOS-Threads, a threads package for TinyOS that combines the ease of a threaded programming model with the efficiency of an event-based kernel. TOSThreads is backwards compatible with existing TinyOS code, supports an evolvable, thread-safe kernel API, and enables flexible application development through dynamic linking and loading. In TOS-Threads, TinyOS code runs at a higher priority than application threads and all kernel operations are invoked only via message passing, never directly, ensuring thread-safety while enabling maximal concurrency. The TOSThreads package is non-invasive; it does not require any large-scale changes to existing TinyOS code. We demonstrate that TOSThreads context switches and system calls introduce an overhead of less than 0.92% and that dynamic linking and loading takes as little as 90 ms for a representative sensing application. We compare different programming models built using TOSThreads, including standard C with blocking system calls and a reimplementation of Tenet. Additionally, we demonstrate that TOSThreads is able to run computationally intensive tasks without adversely affecting the timing of critical OS services.
Starting Page	127
Ending Page	140
Page Count	14
ISBN	9781605585192
DOI	10.1145/1644038.1644052
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2009-11-04
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Tinyos Sensor networks Multi-threading
Content Type	Text
Resource Type	Article

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