49 lines
1.1 KiB
Java
49 lines
1.1 KiB
Java
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//: concurrency/ExplicitCriticalSection.java
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// Using explicit Lock objects to create critical sections.
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package concurrency;
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import java.util.concurrent.locks.*;
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// Synchronize the entire method:
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class ExplicitPairManager1 extends PairManager {
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private Lock lock = new ReentrantLock();
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public synchronized void increment() {
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lock.lock();
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try {
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p.incrementX();
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p.incrementY();
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store(getPair());
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} finally {
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lock.unlock();
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}
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}
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}
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// Use a critical section:
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class ExplicitPairManager2 extends PairManager {
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private Lock lock = new ReentrantLock();
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public void increment() {
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Pair temp;
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lock.lock();
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try {
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p.incrementX();
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p.incrementY();
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temp = getPair();
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} finally {
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lock.unlock();
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}
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store(temp);
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}
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}
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public class ExplicitCriticalSection {
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public static void main(String[] args) throws Exception {
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PairManager
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pman1 = new ExplicitPairManager1(),
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pman2 = new ExplicitPairManager2();
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CriticalSection.testApproaches(pman1, pman2);
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}
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} /* Output: (Sample)
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pm1: Pair: x: 15, y: 15 checkCounter = 174035
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pm2: Pair: x: 16, y: 16 checkCounter = 2608588
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*///:~
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