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Empfohlene Antworten

Veröffentlicht

Hallo

Wie kann ich bei folgende Code ein Deadlock vermeiden. erstens mit Semaphor und zweitens mit wait und notify.

class X {

private X otherX;

private boolean inUse = false;

public void setPartner(X otherX) {

this.otherX = otherX;

}

public synchronized void m1() {

System.out.println("It's method m1");

while (inUse)

try {

otherX.m2();

wait();

} catch (InterruptedException e) { /* ... */ };

inUse = true;

}

public synchronized void m2() {

// OK

System.out.println("It's method m2");

inUse = false;

notify();

}

}

public class UserofX extends Thread {

private X myX;

public UserofX(X x) {

myX = x;

}

public void run() {

for (int i = 0; i < 10000; i++)

myX.m1();

}

public static void main(String[] args) {

X x1 = new X();

X x2 = new X();

x1.setPartner(x2);

x2.setPartner(x1);

UserofX user1 = new UserofX(x1);

user1.start();

UserofX user2 = new UserofX(x2);

user2.start();

}

}

Gruss

Tomas

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