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ÇѱÛÁ¦¸ñ(Korean Title) |
Unix ȯ°æ¿¡¼ ½Ç½Ã°£ ½ºÄÉÁ층À» Áö¿øÇϱâ À§ÇÑ Á¢±Ù ¹æ¾È |
¿µ¹®Á¦¸ñ(English Title) |
An Approach for Supporting Real-Time Scheduling in the Unix Environment |
ÀúÀÚ(Author) |
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Sang-Wook Kim
Jin-Ho Kim
Dae-Yong Kim
Seung-Sun Lee
Wan Choi
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¿ø¹®¼ö·Ïó(Citation) |
VOL 26 NO. 02 PP. 0176 ~ 0188 (1999. 02) |
Çѱ۳»¿ë (Korean Abstract) |
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¿µ¹®³»¿ë (English Abstract) |
It has been known that a general-purpose operating system(GPOS) is not suitable for developing real-time systems since its time sharing based scheduling strategy does not consider the deadline of tasks. If the GPOS can support real-time scheduling, the real-time systems developed in the GPOS enjoy its inherent advantages; high portability, large suite of development tolls, and low systems cost. In this paper, we propose a new approach supporting real-time scheduling in the Unix, a GPOS, by considering the deadline of real-time tasks. Our approach employs a special task called the scheduling daemon, which deals with all the real-time tasks in a system and makes just one task become a ready-to-run state and others sleep state. This causes the Unix scheduler to deal with only one real-time task as a rule, and thus bypasses time sharing based scheduling strategy of the Unix. Therefore, all the real-time tasks are scheduled by the strategy of the scheduling daemon. We implement our approach on the Unix, and build a real-time platform providing C library styled APIs in order that application programmers develop real-time systems more effectively. Moreover, we show the superiority of our approach compared with the previous ones by performance analysis using extensive experiments. |
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