JAVA-BASED REAL-TIME PROGRAMMING

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3. Multi-Threaded Programming decouple the execution, that is, to make object interaction asynchronous but still based on the methods at hand. Hence, the normal case is to hide the mailbox as an attribute inside the object. There is a subclass of Thread that provides that feature, namely class se.lth.cs.realtime.JThread. The featured Java Thread class – JThread To support the most common case that the mailbox in terms of an RTEventBuffer is handled locally within the receiving thread, and encapsulated by the methods of that thread, class se.lth.cs.realtime.JThread contains the following (see volatile on Page 72): public class JThread extends java.lang.Thread { /** The event inbut 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. */ public RTEvent putEvent(RTEvent ev) { mailbox.doPost(ev); // Subclasses may use tryPost. return null; // Subclasses may return resulting event. } // etc. etc. The J in JThread is to stress the fact that this type of thread still is a (concurrent) Java thread (that is, not specified to be real time as will be the case in following chapters). To simplify programming in the case that the same thing should be repeated over and over again, there is a default run method that calls perform according to the following: public void run() { while (!isInterrupted ()) { perform(); } } When implementing the thread behavior, in run or perform, the the doFetch and tryFetch methods are useful, like is this exemplifying perform method: class MyEventProcessor extends JThread { public void perform() { serverObject.process(mailbox.doFetch ()); } } In addition to the methods of the base class Thread as shown on Page 55, this means that the class JThread provides the following simple to implement but convenient methods: RTEvent putEvent(RTEvent ev) // Generic event input void terminate() // Interrupt and join static void sleepUntil(long wakeUpTime) // Sleep until that absolute time void perform() // Override to define cyclic work 96 2012-08-29 16:05
3.4. Message-based communication – Mailboxes Part II Exercises and Labs 97
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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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5. Solutions class YourMonitor { pr
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5. Solutions 5.4 Solution to exerci
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5. Solutions b) After the rewriting
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JAVA-BASED REAL-TIME PROGRAMMING

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