Informatik 12/13 (G9)

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Zuletzt angesehen:
parallelism:monitor:start

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Beide Seiten der vorigen RevisionVorhergehende Überarbeitung
Nächste Überarbeitung		Vorhergehende Überarbeitung
parallelism:monitor:start [2025/03/09 08:00] – [Race condition und Lösungen] Martin Pabstparallelism:monitor:start [2025/03/09 11:42] (aktuell) – [Aufgabe 2] Martin Pabst
Zeile 103: Zeile 103:
  
 <script type="text/plain" title="ThreadTest1.java"> <script type="text/plain" title="ThreadTest1.java">
- 
 Counter counter = new Counter(); Counter counter = new Counter();
 +ArrayList<Thread> threads = new ArrayList<>();
  
 for (int i = 0; i < 3; i++) { for (int i = 0; i < 3; i++) {
Zeile 110: Zeile 110:
    Thread t = new Thread(inc);    Thread t = new Thread(inc);
    t.setName("Thread " + i);    t.setName("Thread " + i);
 +   threads.add(t);
    t.start();    t.start();
 } }
 +
 +for (var t : threads) {
 +   t.join();
 +}
 +
 +println("Der Counter steht jetzt auf: "); print(counter.counter, Color.lightgreen);
  
 class Counter { class Counter {
Zeile 139: Zeile 146:
       for (long i = 1; i <= increment; i++) {       for (long i = 1; i <= increment; i++) {
          counter.increment();          counter.increment();
-         if(i % (increment/10) == 0) println(Thread.currentThread().getName() + " hat " + i + " mal erhöht!");+         if(i % (increment / 10) == 0) println(Thread.currentThread().getName() + " hat " + i + " mal erhöht!");
       }       }
-      println(Thread.currentThread().getName() + "\nDone! Counter steht auf: " + counter.counter, Color.lightgreen);+      println(Thread.currentThread().getName() + "\nDone!", Color.lightblue);
    }    }
  
Zeile 173: Zeile 180:
 <script type="text/plain" title="Semaphore1.java"> <script type="text/plain" title="Semaphore1.java">
 Counter counter = new Counter(); Counter counter = new Counter();
 +ArrayList<Thread> threads = new ArrayList<>();
  
 for (int i = 0; i < 3; i++) { for (int i = 0; i < 3; i++) {
Zeile 178: Zeile 186:
    Thread t = new Thread(inc);    Thread t = new Thread(inc);
    t.setName("Thread " + i);    t.setName("Thread " + i);
 +   threads.add(t);
    t.start();    t.start();
 } }
 +
 +for (var t : threads) {
 +   t.join();
 +}
 +
 +println("\nDer Counter steht jetzt auf: "); print(counter.counter, Color.lightgreen);
 +
  
 class Counter { class Counter {
Zeile 185: Zeile 201:
    Semaphore semaphore = new Semaphore(1);    Semaphore semaphore = new Semaphore(1);
  
-   public synchronized void increment() {   // <-- mit Schlüsselwort synchronized!+   public void increment() {  
       semaphore.acquire();       semaphore.acquire();
       long i = counter;       long i = counter;
Zeile 212: Zeile 228:
          counter.increment();          counter.increment();
       }       }
-      println("\nThread " + index + " done! Counter: " + counter.counter, Color.lightgreen);+      println("\nThread " + index + " done!", Color.lightblue);
    }    }
  
Zeile 258: Zeile 274:
 <script type="text/plain" title="Semaphore1.java"> <script type="text/plain" title="Semaphore1.java">
 NaiveCounter counter = new NaiveCounter(); NaiveCounter counter = new NaiveCounter();
 +ArrayList<Thread> threads = new ArrayList<>();
  
 for (int i = 0; i < 3; i++) { for (int i = 0; i < 3; i++) {
Zeile 263: Zeile 280:
    Thread t = new Thread(inc);    Thread t = new Thread(inc);
    t.setName("Thread " + i);    t.setName("Thread " + i);
 +   threads.add(t);
    t.start();    t.start();
 } }
 +
 +for (var t : threads) {
 +   t.join();
 +}
 +
 +println("\nDer Counter steht jetzt auf: "); print(counter.counter, Color.coral);
 +
 +
  
 class NaiveCounter { class NaiveCounter {
Zeile 300: Zeile 326:
          if(i % (increment / 10) == 0) println(Thread.currentThread().getName() + " hat " + i + " mal erhöht!");          if(i % (increment / 10) == 0) println(Thread.currentThread().getName() + " hat " + i + " mal erhöht!");
       }       }
-      println(Thread.currentThread().getName() + "\nDone! Counter steht auf: " + counter.counter, Color.lightgreen);+      println(Thread.currentThread().getName() + "\nDone!", Color.lightgreen);
    }    }
  
parallelism/monitor/start.1741507235.txt.gz · Zuletzt geändert: 2025/03/09 08:00 von Martin Pabst
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