JAVA-BASED REAL-TIME PROGRAMMING

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4. Exercises and Labs /** * Turns the heating on/off. * @param on True means "heat on", false means "heat off". */ public abstract void setHeating(boolean on); /** * Open/close the water input tap. * @param on True means "open tap", false means "close tap". */ public abstract void setFill(boolean on); /** * Start/stop the water drain pump. * @param on True means "start pump", false means "stop pump". */ public abstract void setDrain(boolean on); /** * Lock/unlock the front door. * @param on True means "lock door", false means "unlock door". */ public abstract void setLock(boolean on); /** * Control the turning motor. * @param direction SPIN_OFF , SPIN_LEFT , SPIN_RIGHT , or SPIN_FAST. */ public abstract void setSpin(int direction); public abstract void start(); /** * Set button listener. The listener’s processButton() method will be * called whenever a button is pressed. */ abstract void setButtonListener(ButtonListener l); /** * Stop spin. */ public static final int SPIN_OFF = 0; /** * Slow left spin. */ public static final int SPIN_LEFT = 1; /** * Slow right spin. */ public static final int SPIN_RIGHT = 2; /** * Fast left spin. */ public static final int SPIN_FAST = 3; }; 126 2012-08-29 16:05
Simulation startup excerpt 4.7. Exercise 5 - Mailbox and lab 3 preparation The simulator main method is located in the Wash class. The simulator basically instantiates a simulation object, registers a ButtonListener that calls the WashingController upon keypresses, and starts a simulation thread. package done; import todo.WashingController; public class Wash { public static void main(String[] args) // ... // Create a washing machine simulation and a controller AbstractWashingMachine theMachine = new WashingMachineSimulation(theSpeed , freakShowProbability); // ... theMachine.setButtonListener(new WashingController(theMachine , theSpeed)); theMachine.start(); // ... } } WashingController The WashingController is implemented by you in the todo folder. Note that a reference to the hardware access interface is provided for you in the WashingController constructor. package todo; import se.lth.cs.realtime.*; import se.lth.cs.realtime.event.*; import done.*; public class WashingController implements ButtonListener { } public WashingController(AbstractWashingMachine theMachine , double theSpeed) { // Create and start your controller threads here } public void processButton(int theButton) { // Handle button presses (0, 1, 2, or 3). A button press // corresponds to starting a new washing program. What should // happen if there is already a running washing program? } Washing program Each washing program is implemented as a transactional thread, i.e. the thread starts up, accomplishes its task, and dies when done. The Washing- Program class acts as a superclass to your washing programs and handles InterruptedException so you do not need to. It also stores references to your controllers (temp, water, spin) so you can access them as myXController in 127
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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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Page 138 and 139: 4. Exercises and Labs Scheduling wi
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