2026-07-20T11:27:58Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:17735 2024-03-06T10:31:56Z ddc:004 open_access

Efficient Abstraction of Clock Synchronization at the Operating System Level Sorrentino, Alessandro Terraneo, Federico Leva, Alberto Clock synchronization Real-time operating systems Embedded software Real-time control Distributed embedded systems are emerging and gaining importance in various domains, including industrial control applications where time determinism - hence network clock synchronization - is fundamental. In modern applications, moreover, this core functionality is required by many different software components, from OS kernel and radio stack up to applications. An abstraction layer devoted to handling time needs therefore introducing, and to encapsulate time corrections at the lowest possible level, the said layer should take the form of a timer device driver offering a Virtual Clock to the entire system. In this paper we show that doing so introduces a nonlinearity in the dynamics of the clock, and we design a controller based on feedback linearization to handle the issue. To put the idea to work, we extend the Miosix RTOS with a generic interface allowing to implement virtual clocks, including the newly designed controller that we call FLOPSYNC-3 after its ancestor. Also, we introduce the resulting virtual clock in the TDMH [Terraneo et al., 2018] real-time wireless mesh protocol. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Alessandro Sorrentino and Federico Terraneo and Alberto Leva 2023 Is Part Of OASIcs, Volume 108, Fourth Workshop on Next Generation Real-Time Embedded Systems (NG-RES 2023) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/OASIcs.NG-RES.2023.4 urn:nbn:de:0030-drops-177357 https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.NG-RES.2023.4 eng https://creativecommons.org/licenses/by/4.0/legalcode