مشاهده مشخصات مقاله
A Predictable Interrupt Management Policy for Real-Time Operating Systems
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نویسنده (ها) |
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مربوط به کنفرانس |
سمپوزیوم سیستمها و فنآوریهای بیدرنگ و نهفته RTEST 2015 |
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چکیده |
Real-time operating systems play important roles indeveloping many of today’s embedded systems. Majority of theseembedded systems have intense interactions with the environmentthrough I/O devices, namely sensors and actuators. Interruptsare often used by the operating systems to handle these interactionsthrough executing the corresponding interrupt serviceroutines (ISRs). ISRs are usually executed non-preemptively atsome priorities higher than system tasks. Depending on theinterrupt frequency, this prioritization can result in problemslike unresponsiveness and unpredictability in the system, even forthe high priority tasks. This incurs a type of priority inversionwhich we call it ISR-task priority inversion (ITPI). This paperuses threaded interrupts and employs the priority inheritanceprotocol (PIP) to enforce each interrupt service thread (IST) tobe executed at its owner’s priority, causing less interference withhigher priority tasks. Two PIP-based approaches are proposedand implemented: 1) Static priority linked list, which uses PIPonly when a task starts; experimental results show that thisapproach can tolerate some simple forms of ITPI, and 2) Dynamicpriority bitmap, which employs PIP whenever a task needs anIST; experiments show that more complex forms of ITPI can betolerated with this approach. The almost extensive experimentalresults show that using the dynamic priority approach enhancesthe real-time system predictability compared to the commonapproaches. |
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قیمت |
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