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Real-Time Systems by Rajib Mall

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3

Handling Resource Sharing and Dependencies Among Real-Time Tasks

The different task scheduling algorithms that we discussed in the last chapter were all based on the premise that the different tasks in a system are all independent. However, that is rarely the case in real-life applications. Tasks often have explicit dependencies specified among themselves, however implicit dependencies are more common. Tasks might become inter dependent for several reasons. A common form of dependency arises when one task needs the results of another task to proceed with its computations. For example, the positional error computation task of a fly-by-wire aircraft may need the results of a task computing the current position of the aircraft from the sampled ...

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