JAVA-BASED REAL-TIME PROGRAMMING

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4. Exercises and Labs Scheduling with blocking Consider a system with threads A, B, C, and D according to exercise 1b. These threads communicate via three monitors; M1, M2, M3. The used monitor operations and their worst-case execution time are depicted in the following figure: A a(); 0.1 M1 b(); 1.0 s(); 0.1 M2 t(); 0.5 c(); 0.5 x(); 1.0 M3 y(); 2.0 B D Our real-time kernel (or JVM) provides dynamic priority inheritance. 1. Compute the maximum response time including the blocking that may occur. Is there any thread that can have difficulties to ensure that its deadline is met? What about robustness in the case that some given execution time should be a little longer than specified? 2. The thread D was rewritten to do half the work each sample and to be run twice as often; the timing requirements were changed from 20, 2 to 10, 1. Furthermore, the monitor operation y was split up into four smaller parts y1(), y2(), y3() and y4(), each with execution time 0.5. What does this imply for the scheduling of the system? 3. Due to the special demands from the control carried out by thread A, that thread needs to fulfill a shorter deadline of 2 (instead of 4, which still is the period) time units. Propose a restructuring of the system so that the deadlines are met, without changing the monitor operations. 138 2012-08-29 16:05 C
4.9 Lab 3 – Washing machine 4.9. Lab 3 – Washing machine You will implement the control system for the washing machine, prepared in exercise 5. Preparation It is generally a good idea to start programming before the lab occasion. The handout code is available on the course homepage as a zipped Eclipse workspace (it is part of the same zip you downloaded for lab 1). The todo folder contains skeletons for most of the classes that you need to implement. 139
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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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3.4 Message-based communication - M
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