Line | |
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1 | class ClasseAttiva extends Thread{
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2 | protected static int shared = 0;
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3 | protected static Object lock = new Object();
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4 | public void run() {
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5 | while (true) {
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6 | synchronized(lock){
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7 | if (shared >= 10) break;
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8 | try {
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9 | Thread.sleep(1000);
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10 | }
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11 | catch(InterruptedException e){
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12 | System.err.println(e);
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13 | }
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14 | if (shared >= 10){
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15 | throw new Error("Corsa critica!!!");
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16 | }
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17 | System.out.print(this.getName());
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18 | System.out.print(" s = ");
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19 | System.out.println(this.shared);
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20 | shared += 1;
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21 | }
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22 | Thread.yield(); // non necessaria, ma favorisce lo scheduling di entrambi
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23 | }
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24 | }
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25 | }
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26 |
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27 |
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28 |
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29 | public class Shared2 {
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30 | public static final void main(final String[] args) {
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31 | ClasseAttiva o1 = new ClasseAttiva();
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32 | ClasseAttiva o2 = new ClasseAttiva();
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33 | o1.start();
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34 | o2.start();
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35 | while (true){
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36 | try {
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37 | Thread.sleep(1000);
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38 | }
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39 | catch(InterruptedException e){
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40 | System.err.println(e);
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41 | }
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42 |
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43 | System.out.println("Main thread");
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44 | }
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45 |
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46 | }
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47 | }
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48 |
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49 |
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50 |
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