• KIPS Transactions on Computer and Communication Systems
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• v.6 no.12
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• pp.469-478
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• 2017

The mutual exclusion is originally based on the theory of race condition prevention in symmetric multi-processor operating systems. But recently, due to the generalization of multi-core processors, its application range has been rapidly shifted to parallel processing application domain. POSIX thread, WIN32 thread, and Java thread, which are typical parallel processing application development environments, provide a unique mutual exclusion mechanism for each of them. Applications that are very sensitive to performance in these environments may want to reduce the burden of mutual exclusion, even at some cost, such as inconvenience of coding. In this study, we implement Dekker's and Peterson's algorithm in the form of busy-wait and processor-yield in various platforms, and compare the performance of them with the built-in mutual exclusion mechanisms to evaluate the usability of the classic algorithms. The analysis result shows that Dekker's algorithm of processor-yield type is superior to the built-in mechanisms in POSIX and WIN32 thread environments at least 2 times and up to 70 times, and confirms that the practicality of the algorithm is sufficient.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.38-39
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• 2016

운영체제 수업 내용 중 가장 흥미로우면서도 이해하기가 어려운 부분이 상호배제 알고리즘이다. 이 논문에서는 상호배제 알고리즘으로 널리 알려진 Dekker's 알고리즘과 Peterson's 알고리즘을 C 언어 환경에서 실험하는 과정에서 겪은 시행착오를 공유함으로써 보다 효율적인 학습에 도움을 주고자 한다. 또한, Dekker's 알고리즘의 개선으로 이루어진 Peterson's 알고리즘은 성능 관점에서는 오히려 크게 저조하게 나타났는데 그 원인을 분석한다.