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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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|
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/* |
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* @test |
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* @bug 6941130 |
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* @summary Numeric overflow/underflow of permits causes Error throw |
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*/ |
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|
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import java.util.concurrent.Semaphore; |
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|
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public class PermitOverflow { |
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|
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public static void main(String[] args) throws Throwable { |
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for (boolean fair : new boolean[] { true, false }) { |
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Semaphore sem = new Semaphore(Integer.MAX_VALUE - 1, fair); |
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if (sem.availablePermits() != Integer.MAX_VALUE - 1) |
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throw new RuntimeException(); |
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try { |
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sem.release(2); |
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throw new RuntimeException(); |
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} catch (Error expected) { |
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} |
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sem.release(1); |
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if (sem.availablePermits() != Integer.MAX_VALUE) |
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throw new RuntimeException(); |
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try { |
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sem.release(1); |
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throw new RuntimeException(); |
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} catch (Error expected) { |
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} |
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try { |
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sem.release(Integer.MAX_VALUE); |
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throw new RuntimeException(); |
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} catch (Error expected) { |
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} |
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} |
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|
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class Sem extends Semaphore { |
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public Sem(int permits, boolean fair) { |
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super(permits, fair); |
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} |
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public void reducePermits(int reduction) { |
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super.reducePermits(reduction); |
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} |
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} |
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|
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for (boolean fair : new boolean[] { true, false }) { |
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Sem sem = new Sem(Integer.MIN_VALUE + 1, fair); |
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if (sem.availablePermits() != Integer.MIN_VALUE + 1) |
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throw new RuntimeException(); |
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try { |
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sem.reducePermits(2); |
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throw new RuntimeException(); |
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} catch (Error expected) { |
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} |
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sem.reducePermits(1); |
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if (sem.availablePermits() != Integer.MIN_VALUE) |
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throw new RuntimeException(); |
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try { |
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sem.reducePermits(1); |
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throw new RuntimeException(); |
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} catch (Error expected) { |
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} |
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try { |
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sem.reducePermits(Integer.MAX_VALUE); |
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throw new RuntimeException(); |
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} catch (Error expected) { |
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} |
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} |
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} |
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} |
