NWEN303 Concurrent Programming 8 Critical section Do It Yourself Marco Servetto VUW ● ● ● Critical Section The main Idea of the critical section: A room, that can host only one person at the time, That person can – assume the room is in a tied-up (coherent) state – mess up with the stuff in […]
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NWEN303 Concurrent Programming 18: Ass3 Model answers and Clustering Marco Servetto VUW Ass3 model answers Q1.1 Is ‘new Point(0,0)’ an expression referring to a deeply immutable object? Yes, all Point fields are final Q1.2 Is ‘new Person(“bob”,new Point(0,0))’ an expression referring to a deeply immutable object? No, Person fields can be mutated; however new Person(“bob”,new
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NWEN303 Concurrent Programming 14: Model solutions for Ass2(universe) and Model solutions for MockTermTest Marco Servetto VUW ● Ass2 universe Gui.java already has a minimal form of parallelism. [..] schedulerRepaint = new ScheduledThreadPoolExecutor(1); [..] schedulerSimulation = new ScheduledThreadPoolExecutor(1); … schedulerRepaint.scheduleAtFixedRate(()->{ if(!schedulerRepaint.getQueue().isEmpty()){..return;} try {SwingUtilities.invokeAndWait(()->repaint());} catch (InvocationTargetException | InterruptedException e) {..} }, 500,5, TimeUnit.MILLISECONDS); … /*inside paint:*/ for(DrawableParticle
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NWEN303 Concurrent Programming 3 The Bad and the Good Marco Servetto VUW ● ● ● ● ● ● ● Last lecture recap Concurrency: Multiple things happening at once. Fork-Join is a simple concurrent model that generalizes Divide and Conquer. .parallelStream() is a simple solution to use Fork-Join in a Java program. Try to use more
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NWEN303 Concurrent Programming 2 A conceptual model for concurrency Marco Servetto VUW ● A conceptual model for Concurrency In a non concurrent model of computation operations are executed one after the other in order. An operation can start only after the former operation ended. You can visualize this model imagining yourself doing a task alone.
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NWEN303 Concurrent Programming 16: Actors and Message Passing 3 Marco Servetto VUW ● ● ● package akkaUtils; import java.io.IOException; import java.util.Map; import java.util.concurrent.CompletableFuture; import akka.actor.ActorSystem; import akka.actor.Terminated; public class OpenAkka{ public static void main(String[]args) throws InterruptedException { ActorSystem s = AkkaConfig.newSystem(“OpenAkka”,2500,Map.of()); String ip=””+s.settings().config().getAnyRef(“akka.remote.netty.tcp.hostname”); System.out.println(“Chosen IP is “+ip); keybordClose(s); } public static void keybordClose(ActorSystem s) throws
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NWEN303 Concurrent Programming 12: Common parallel patterns: Locks, readers/writes Marco Servetto VUW Synchronized and locks Synchronized block are *a* solution to the critical section problem. It is provided by the language. There is also the Lock class. The biggest advantage of Lock objects over synchronized blocks is their ability to back out of an attempt
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NWEN303 Concurrent Programming 6 Java memory model Marco Servetto VUW ● Just Writing parallel programs is bad, but if there is no communication at all between running processes, we can rely on good libraries and our programs can become more verbose, but not exponentially more complicated. Life with non-communicating tasks is not simple, but is
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NWEN303 Concurrent Programming 7 Critical section Coherent data Monitors, condition variables and Synchronized keyword Marco Servetto VUW ● ● ● – – – ● ● Person: a worker while executing a task The room is a metaphor for an object Critical Section The main Idea of the critical section: a room, that can host only
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NWEN303 Concurrent Programming 11: Common parallel patterns: Producer Consumer Marco Servetto VUW ● – – Producer consumer Producer consumer: pipeline instead of fork-join factory metaphor, where objects are produced in steps, and each step can be made in parallel with the others, and specialized workers can act better and faster on a specialized part of
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