29 lines
812 B
Java
29 lines
812 B
Java
// concurrency/MutexEvenSupplier.java
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// ©2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Preventing thread collisions with mutexes.
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// {TimeOutDuringTesting}
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import java.util.concurrent.locks.*;
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public class MutexEvenSupplier extends IntSupplier {
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private int currentEvenValue = 0;
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private Lock lock = new ReentrantLock();
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@Override
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public int next() {
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lock.lock();
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try {
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++currentEvenValue;
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Thread.yield(); // Cause failure faster
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++currentEvenValue;
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return currentEvenValue;
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} finally {
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lock.unlock();
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}
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}
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public static void main(String[] args) {
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EvenChecker.test(new MutexEvenSupplier());
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}
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}
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/* Output: (None) */
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