JAVA-BASED REAL-TIME PROGRAMMING

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4. Exercises and Labs } /** Draws a lift basket containing load persons on floor number floor. If * the number of persons in the lift is less than it was the last time * drawLift was called , an animation showing a person leaving the lift is * displayed. Should be called whenever the number of persons in the * lift is changed. */ public void drawLift(int floor , int load); /** Draws persons number of persons waiting for the lift on floor floor. * Should be called whenever the number of waiting persons is changed. */ public void drawLevel(int floor , int persons); /** Shows an animation moving the lift basket from floor number here to * floor number next. The number of persons drawed in the lift is the same * as the number of persons passed to drawLift the last time it was * called. */ public void moveLift(int here , int next); There are some additional requirements on when the above methods may be called. The drawLift and drawLevel methods must be called every time the number of persons in the lift or waiting persons on a floor, respectively, are changed. It is not possible to follow the simulation on the screen otherwise. The LiftView class is not entirely thread-safe, i.e. strange things can happen if two threads call methods in the class simultaneously. You will therefore be forced to consider a LiftView object a shared reseource to which access must be synchronized. The following rules apply: • Two threads must not simultaneously call drawLevel. • Two threads must not call drawLift simultaneously. To speed up the simulation and make the animation more realistic you should allow drawLevel to be called at the same time as a call to moveLift is in progress. Calling moveLift should thus not block other threads. Miscellaneous It is not allowed to share thread and monitor classes. This is often a good design praxis when building embedded systems. Random numbers can be generated using the Math.random() method which returns a random number between 0 and 1 (not including 1.000...). To generate a random delay between 0 and 45 seconds you can for example write: int delay = 1000*((int)(Math.random ()*46.0)); // sleep need milliseconds Note that we have to multiply with 46 instead of 45 in order to make it possible to receive 45 as the result. It is highly recommended that you write your program and attempt to remove any compilation errors before the laboratory session. Testing the program and removing errors can require a lot of time in some cases. 120 2012-08-29 16:05
4.6 Lab 2 – Lift 4.6. Lab 2 – Lift In this lab you are going to implement the lift simulation prepared in the previous exercise. 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 handout code contains only the visualization class (LiftView), the rest you must implement yourself. The LiftView class contains a main method with a test case. 121
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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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