JAVA-BASED REAL-TIME PROGRAMMING

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4. Exercises and Labs } /** * @return Target temperature */ public double getTemperature() { ... } /** Temperature regulation off (no heating) */ public static final int TEMP_IDLE = 0; /** Reach and hold the given temperature */ public static final int TEMP_SET = 1; /** * This event is sent by washing program processes to the spin * controller process. It is an order to set a particular spin. */ public class SpinEvent extends RTEvent { } /** * @param mode Spin regulation mode (SPIN_OFF , SPIN_SLOW , SPIN_FAST) */ public SpinEvent(Object source , int mode) { ... } /** * @return Spin regulation mode (SPIN_OFF , SPIN_SLOW , or SPIN_FAST) */ public int getMode() { ... } public static final int SPIN_OFF = 0; public static final int SPIN_SLOW = 1; public static final int SPIN_FAST = 2; 132 2012-08-29 16:05
The se.lth.cs.realtime package 4.7. Exercise 5 - Mailbox and lab 3 preparation The realtime package provides a message passing runtime system used by the classes above. All threads contain a mailbox attribute. Threads check their own mailboxes using doFetch/tryFetch (blocking/non-blocking) methods. They post messages to other threads using the putEvent method on the other thread. RTThread Superclass of all thread classes. Used for transactional threads. Note the mailbox attribute and the interrupt method. public abstract class RTThread implements Activity , RTEventListener , RTEventSource { } /** The event input buffer. */ protected volatile RTEventBuffer mailbox; /** * Put the time -stamped event in the input buffer of this thread. If the * buffer is full , the caller is blocked. * * @return null , but subclasses are free to return an event if desired to * inform about blocking or results. */ public RTEvent putEvent(RTEvent ev) { mailbox.doPost(ev); return null; } /** * Interrupts this thread. Thus an interruption -flag is set , which may * raise an InterruptedException in the interrupted thread; otherwise the * flag can be checked via interrupted or isInterrupted. */ public void interrupt() { ... } /** * Tests if the current thread has been interrupted. The interruption -flag * is reset. * * Note that interrupted is a static method , while * isInterrupted is called on this Thread instance. * * @return true if the current thread has been interrupted; * false otherwise. */ public static boolean interrupted() { ... } /** * Tests if this thread is alive. A thread is alive if it has been started * and has not yet died. * * @return true if this thread is alive; false otherwise. */ public final boolean isAlive() { ... } 133
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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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Page 110 and 111: 4. Exercises and Labs Some advice o
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Page 120 and 121: 4. Exercises and Labs } /** Draws a
Page 122 and 123: 4. Exercises and Labs public static
Page 124 and 125: 4. Exercises and Labs Specification
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Page 128 and 129: 4. Exercises and Labs your washing
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Page 134 and 135: 4. Exercises and Labs PeriodicThrea
Page 136 and 137: 4. Exercises and Labs Miscellaneous
Page 138 and 139: 4. Exercises and Labs Scheduling wi
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Page 142 and 143: 5. Solutions 2. With some additiona
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