JAVA-BASED REAL-TIME PROGRAMMING

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4. Exercises and Labs Miscellaneous The simulation is based on the following data: Volume: 20 l (filled up to 10 l) Power: 2 kW Water input flow: 0.1 l/s Water output flow: 0.2 l/s Rotation speed: 15 rpm (slow), 800 rpm (fast) A complete wash typically takes 1h - 2h to complete. To facilitate testing the simulation has a speed parameter which can be used to speed up the simulation. Speed=1 corresponds to actual time, and e.g. speed=10 makes the simulation go 10 times as fast. Although the prewritten simulation software takes the speed parameter into account, you still have to use it yourself in some parts of your code. For instance, the washing times (15, 30, and 45 minutes) must be scaled in the control software to get a consistent simulation. Terminating washing programs from WashingController When the user presses button 0, the current washing program should be terminated. You can do this by calling the interrupt() method on that washing program. This method will, in turn, result in an InterruptedException being thrown in your washing program. Allowing your washing program to be terminated Your washing program may be terminated at any point. This will result in an InterruptedException being thrown from, for example, a waitEvent call to the event queue in your washing program. You should not catch the InterruptedException in your washing programs. Instead, use the WashingProgram class as a superclass and write your washing program in the wash() method. That method propagates the InterruptedException to the run() method of the WashingProgram superclass, which handles that exception. InterruptedException may be thrown in a few other situations, as you may know, such as sleep calls. You should handle these the same way, that is, not at all. 136 2012-08-29 16:05
4.8 Exercise 6 - Scheduling analysis Scheduling Consider a system with the following threads: T C A: 4 1 B: 5 2 C: 8 1 4.8. Exercise 6 - Scheduling analysis where T denotes the desired period and C is the worst-case execution time (WCET). Apply Rate Monotonic Scheduling (RMS) to obtain the priority for each thread. 1. Is the system schedulable, i.e., will the computer meet its deadlines? (The deadline for each thread is equal to T.) What will the worst case response time be for each thread? 2. The system is extended with an additional thread: D: 20 2 Will the system still be schedulable? What about the response times? 3. The D thread is exchanged by a thread E with the following execution time properties: E: 12 1.2 Analyze the schedulability also in this case. 137
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JAVA-BASED REAL-TIME PROGRAMMING Kl
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• Each piece of software must be
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Contents I Concurrent programming i
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Part I Concurrent programming in Ja
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1. Introduction pany depends on the
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1. Introduction control may be dela
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Chapter 2 Fundamentals Goal: Review
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2.2. Our physical world is parallel
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2.4. Concurrency a trend that the p
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2.4. Concurrency Behind the term co
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2.4. Concurrency in functions like
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2.5. Interrupts, pre-emption, and r
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2.5. Interrupts, pre-emption, and r
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2.6. Models of concurrent execution
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Object properties Implicit mutual e
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2.6. Models of concurrent execution
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2.7 Multi-process programming 2.7.
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2.9. Software issues In this chapte
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Chapter 3 Multi-Threaded Programmin
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3.1.1 Thread creation At start of a
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to foresee the value actually retur
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3.1. Threads first obtains the curr
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the run-time system (that is, the s
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3.1.6 Thread interruption and termi
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• If the operation of an industri
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3.2. Resources and mutual exclusion
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give give give 3.2. Resources and m
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synch. T1 entry give take 3.2. Reso
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class Account { int balance; Semaph
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3.3. Objects providing mutual exclu
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class Producer extends Thread { pub
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JAVA-BASED REAL-TIME PROGRAMMING

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