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/* |
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* Written by members of JCP JSR-166 Expert Group and released to the |
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* public domain. Use, modify, and redistribute this code in any way |
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* without acknowledgement. Other contributors include Andrew Wright, |
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* Jeffrey Hayes, Pat Fischer, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.util.*; |
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import java.util.concurrent.*; |
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public class SemaphoreTest extends TestCase{ |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run (suite()); |
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} |
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public static Test suite() { |
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return new TestSuite(SemaphoreTest.class); |
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} |
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private static long SHORT_DELAY_MS = 100; |
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private static long MEDIUM_DELAY_MS = 1000; |
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private static long LONG_DELAY_MS = 10000; |
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public void testConstructor1() { |
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Semaphore s = new Semaphore(0); |
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assertEquals(0, s.availablePermits()); |
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} |
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public void testConstructor2() { |
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Semaphore s = new Semaphore(-1); |
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assertEquals(-1, s.availablePermits()); |
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} |
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public void testTryAcquireInSameThread() { |
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Semaphore s = new Semaphore(2); |
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assertEquals(2, s.availablePermits()); |
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assertTrue(s.tryAcquire()); |
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assertTrue(s.tryAcquire()); |
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assertEquals(0, s.availablePermits()); |
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assertFalse(s.tryAcquire()); |
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} |
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public void testAcquireReleaseInSameThread(){ |
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Semaphore s = new Semaphore(1); |
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try { |
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s.acquire(); |
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s.release(); |
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s.acquire(); |
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s.release(); |
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s.acquire(); |
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s.release(); |
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s.acquire(); |
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s.release(); |
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s.acquire(); |
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s.release(); |
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assertEquals(1, s.availablePermits()); |
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} catch( InterruptedException e){ |
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fail("unexpected exception"); |
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} |
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} |
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public void testAcquireUninterruptiblyReleaseInSameThread(){ |
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Semaphore s = new Semaphore(1); |
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try { |
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s.acquireUninterruptibly(); |
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s.release(); |
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s.acquireUninterruptibly(); |
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s.release(); |
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s.acquireUninterruptibly(); |
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s.release(); |
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s.acquireUninterruptibly(); |
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s.release(); |
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s.acquireUninterruptibly(); |
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s.release(); |
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assertEquals(1, s.availablePermits()); |
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} finally { |
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} |
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} |
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public void testAcquireReleaseInDifferentThreads() { |
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final Semaphore s = new Semaphore(1); |
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Thread t = new Thread(new Runnable(){ |
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public void run(){ |
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try{ |
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s.acquire(); |
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s.release(); |
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s.release(); |
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s.acquire(); |
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}catch(InterruptedException ie){ |
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fail("unexpected exception"); |
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} |
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} |
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}); |
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t.start(); |
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try { |
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s.release(); |
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s.release(); |
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s.acquire(); |
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s.acquire(); |
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t.join(); |
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} catch( InterruptedException e){ |
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fail("unexpected exception"); |
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} |
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} |
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public void testTimedAcquireReleaseInSameThread(){ |
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Semaphore s = new Semaphore(1); |
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try { |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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s.release(); |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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s.release(); |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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s.release(); |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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s.release(); |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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s.release(); |
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assertEquals(1, s.availablePermits()); |
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} catch( InterruptedException e){ |
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fail("unexpected exception"); |
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} |
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} |
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public void testTimedAcquireReleaseInDifferentThreads() { |
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final Semaphore s = new Semaphore(1); |
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Thread t = new Thread(new Runnable(){ |
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public void run(){ |
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try{ |
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s.release(); |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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s.release(); |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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}catch(InterruptedException ie){ |
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fail("unexpected exception"); |
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} |
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} |
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}); |
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t.start(); |
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try { |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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s.release(); |
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assertTrue(s.tryAcquire(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)); |
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s.release(); |
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t.join(); |
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} catch( InterruptedException e){ |
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fail("unexpected exception"); |
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} |
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} |
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public void testAcquire_InterruptedException(){ |
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final Semaphore s = new Semaphore(0); |
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Thread t = new Thread(new Runnable(){ |
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public void run(){ |
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try{ |
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s.acquire(); |
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fail("should throw"); |
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}catch(InterruptedException success){} |
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} |
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}); |
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t.start(); |
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try{ |
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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} catch(InterruptedException e){ |
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fail("unexpected exception"); |
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} |
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} |
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public void testTryAcquire_InterruptedException(){ |
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final Semaphore s = new Semaphore(0); |
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Thread t = new Thread(new Runnable(){ |
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public void run(){ |
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try{ |
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s.tryAcquire(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS); |
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fail("should throw"); |
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}catch(InterruptedException success){ |
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} |
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} |
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}); |
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t.start(); |
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try{ |
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Thread.sleep(SHORT_DELAY_MS); |
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t.interrupt(); |
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t.join(); |
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} catch(InterruptedException e){ |
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fail("unexpected exception"); |
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} |
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} |
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} |