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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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|
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import junit.framework.*; |
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import java.util.concurrent.locks.*; |
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import java.util.concurrent.*; |
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import java.io.*; |
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|
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public class ReentrantReadWriteLockTest extends JSR166TestCase { |
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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(ReentrantReadWriteLockTest.class); |
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} |
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|
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|
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/** |
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* write-locking and read-locking an unlocked lock succeed |
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*/ |
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public void testLock() { |
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ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); |
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rl.writeLock().lock(); |
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rl.writeLock().unlock(); |
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rl.readLock().lock(); |
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rl.readLock().unlock(); |
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} |
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|
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|
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/** |
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* locking an unlocked fair lock succeeds |
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*/ |
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public void testFairLock() { |
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ReentrantReadWriteLock rl = new ReentrantReadWriteLock(true); |
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rl.writeLock().lock(); |
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rl.writeLock().unlock(); |
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rl.readLock().lock(); |
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rl.readLock().unlock(); |
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} |
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|
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/** |
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* write-unlocking an unlocked lock throws IllegalMonitorStateException |
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*/ |
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public void testUnlock_IllegalMonitorStateException() { |
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ReentrantReadWriteLock rl = new ReentrantReadWriteLock(); |
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try { |
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rl.writeLock().unlock(); |
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shouldThrow(); |
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} catch(IllegalMonitorStateException success){} |
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} |
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|
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|
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/** |
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* write-lockInterruptibly is interruptible |
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*/ |
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public void testWriteLockInterruptibly_Interrupted() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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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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lock.writeLock().lockInterruptibly(); |
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threadShouldThrow(); |
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} catch(InterruptedException success){} |
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} |
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}); |
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try { |
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t.start(); |
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t.interrupt(); |
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lock.writeLock().unlock(); |
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t.join(); |
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* timed write-trylock is interruptible |
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*/ |
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public void testWriteTryLock_Interrupted() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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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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lock.writeLock().tryLock(1000,TimeUnit.MILLISECONDS); |
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threadShouldThrow(); |
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} catch(InterruptedException success){} |
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} |
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}); |
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try { |
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t.start(); |
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t.interrupt(); |
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lock.writeLock().unlock(); |
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t.join(); |
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* read-lockInterruptibly is interruptible |
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*/ |
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public void testReadLockInterruptibly_Interrupted() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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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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lock.readLock().lockInterruptibly(); |
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threadShouldThrow(); |
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} catch(InterruptedException success){} |
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} |
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}); |
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try { |
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t.start(); |
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t.interrupt(); |
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lock.writeLock().unlock(); |
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t.join(); |
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* timed read-trylock is interruptible |
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*/ |
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public void testReadTryLock_Interrupted() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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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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lock.readLock().tryLock(1000,TimeUnit.MILLISECONDS); |
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threadShouldThrow(); |
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} catch(InterruptedException success){} |
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} |
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}); |
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try { |
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t.start(); |
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t.interrupt(); |
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t.join(); |
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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|
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/** |
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* write-trylock fails if locked |
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*/ |
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public void testWriteTryLockWhenLocked() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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threadAssertFalse(lock.writeLock().tryLock()); |
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} |
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}); |
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try { |
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t.start(); |
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t.join(); |
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lock.writeLock().unlock(); |
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* read-trylock fails if locked |
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*/ |
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public void testReadTryLockWhenLocked() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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threadAssertFalse(lock.readLock().tryLock()); |
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} |
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}); |
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try { |
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t.start(); |
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t.join(); |
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lock.writeLock().unlock(); |
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* Multiple threads can hold a read lock when not write-locked |
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*/ |
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public void testMultipleReadLocks() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.readLock().lock(); |
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Thread t = new Thread(new Runnable() { |
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public void run() { |
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threadAssertTrue(lock.readLock().tryLock()); |
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lock.readLock().unlock(); |
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} |
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}); |
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try { |
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t.start(); |
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t.join(); |
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lock.readLock().unlock(); |
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* A writelock succeeds after reading threads unlock |
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*/ |
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public void testWriteAfterMultipleReadLocks() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.readLock().lock(); |
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Thread t1 = new Thread(new Runnable() { |
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public void run() { |
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lock.readLock().lock(); |
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lock.readLock().unlock(); |
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} |
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}); |
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Thread t2 = new Thread(new Runnable() { |
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public void run() { |
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lock.writeLock().lock(); |
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lock.writeLock().unlock(); |
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} |
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}); |
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|
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try { |
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t1.start(); |
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t2.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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lock.readLock().unlock(); |
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t1.join(MEDIUM_DELAY_MS); |
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t2.join(MEDIUM_DELAY_MS); |
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assertTrue(!t1.isAlive()); |
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assertTrue(!t2.isAlive()); |
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|
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} catch(Exception e){ |
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unexpectedException(); |
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} |
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} |
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|
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/** |
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* Readlocks succeed after a writing thread unlocks |
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*/ |
251 |
public void testReadAfterWriteLock() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
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lock.writeLock().lock(); |
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Thread t1 = new Thread(new Runnable() { |
255 |
public void run() { |
256 |
lock.readLock().lock(); |
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lock.readLock().unlock(); |
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} |
259 |
}); |
260 |
Thread t2 = new Thread(new Runnable() { |
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public void run() { |
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lock.readLock().lock(); |
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lock.readLock().unlock(); |
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} |
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}); |
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|
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try { |
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t1.start(); |
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t2.start(); |
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Thread.sleep(SHORT_DELAY_MS); |
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lock.writeLock().unlock(); |
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t1.join(MEDIUM_DELAY_MS); |
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t2.join(MEDIUM_DELAY_MS); |
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assertTrue(!t1.isAlive()); |
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assertTrue(!t2.isAlive()); |
276 |
|
277 |
} catch(Exception e){ |
278 |
unexpectedException(); |
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} |
280 |
} |
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|
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|
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/** |
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* Read trylock succeeds if readlocked but not writelocked |
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*/ |
286 |
public void testTryLockWhenReadLocked() { |
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final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
288 |
lock.readLock().lock(); |
289 |
Thread t = new Thread(new Runnable() { |
290 |
public void run() { |
291 |
threadAssertTrue(lock.readLock().tryLock()); |
292 |
lock.readLock().unlock(); |
293 |
} |
294 |
}); |
295 |
try { |
296 |
t.start(); |
297 |
t.join(); |
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lock.readLock().unlock(); |
299 |
} catch(Exception e){ |
300 |
unexpectedException(); |
301 |
} |
302 |
} |
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|
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|
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|
306 |
/** |
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* write trylock fails when readlocked |
308 |
*/ |
309 |
public void testWriteTryLockWhenReadLocked() { |
310 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
311 |
lock.readLock().lock(); |
312 |
Thread t = new Thread(new Runnable() { |
313 |
public void run() { |
314 |
threadAssertFalse(lock.writeLock().tryLock()); |
315 |
} |
316 |
}); |
317 |
try { |
318 |
t.start(); |
319 |
t.join(); |
320 |
lock.readLock().unlock(); |
321 |
} catch(Exception e){ |
322 |
unexpectedException(); |
323 |
} |
324 |
} |
325 |
|
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|
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|
328 |
/** |
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* write timed trylock times out if locked |
330 |
*/ |
331 |
public void testWriteTryLock_Timeout() { |
332 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
333 |
lock.writeLock().lock(); |
334 |
Thread t = new Thread(new Runnable() { |
335 |
public void run() { |
336 |
try { |
337 |
threadAssertFalse(lock.writeLock().tryLock(1, TimeUnit.MILLISECONDS)); |
338 |
} catch (Exception ex) { |
339 |
threadUnexpectedException(); |
340 |
} |
341 |
} |
342 |
}); |
343 |
try { |
344 |
t.start(); |
345 |
t.join(); |
346 |
lock.writeLock().unlock(); |
347 |
} catch(Exception e){ |
348 |
unexpectedException(); |
349 |
} |
350 |
} |
351 |
|
352 |
/** |
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* read timed trylock times out if write-locked |
354 |
*/ |
355 |
public void testReadTryLock_Timeout() { |
356 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
357 |
lock.writeLock().lock(); |
358 |
Thread t = new Thread(new Runnable() { |
359 |
public void run() { |
360 |
try { |
361 |
threadAssertFalse(lock.readLock().tryLock(1, TimeUnit.MILLISECONDS)); |
362 |
} catch (Exception ex) { |
363 |
threadUnexpectedException(); |
364 |
} |
365 |
} |
366 |
}); |
367 |
try { |
368 |
t.start(); |
369 |
t.join(); |
370 |
lock.writeLock().unlock(); |
371 |
} catch(Exception e){ |
372 |
unexpectedException(); |
373 |
} |
374 |
} |
375 |
|
376 |
|
377 |
/** |
378 |
* write lockInterruptibly succeeds if lock free else is interruptible |
379 |
*/ |
380 |
public void testWriteLockInterruptibly() { |
381 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
382 |
try { |
383 |
lock.writeLock().lockInterruptibly(); |
384 |
} catch(Exception e) { |
385 |
unexpectedException(); |
386 |
} |
387 |
Thread t = new Thread(new Runnable() { |
388 |
public void run() { |
389 |
try { |
390 |
lock.writeLock().lockInterruptibly(); |
391 |
threadShouldThrow(); |
392 |
} |
393 |
catch(InterruptedException success) { |
394 |
} |
395 |
} |
396 |
}); |
397 |
try { |
398 |
t.start(); |
399 |
t.interrupt(); |
400 |
t.join(); |
401 |
lock.writeLock().unlock(); |
402 |
} catch(Exception e){ |
403 |
unexpectedException(); |
404 |
} |
405 |
} |
406 |
|
407 |
/** |
408 |
* read lockInterruptibly succeeds if lock free else is interruptible |
409 |
*/ |
410 |
public void testReadLockInterruptibly() { |
411 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
412 |
try { |
413 |
lock.writeLock().lockInterruptibly(); |
414 |
} catch(Exception e) { |
415 |
unexpectedException(); |
416 |
} |
417 |
Thread t = new Thread(new Runnable() { |
418 |
public void run() { |
419 |
try { |
420 |
lock.readLock().lockInterruptibly(); |
421 |
threadShouldThrow(); |
422 |
} |
423 |
catch(InterruptedException success) { |
424 |
} |
425 |
} |
426 |
}); |
427 |
try { |
428 |
t.start(); |
429 |
t.interrupt(); |
430 |
t.join(); |
431 |
lock.writeLock().unlock(); |
432 |
} catch(Exception e){ |
433 |
unexpectedException(); |
434 |
} |
435 |
} |
436 |
|
437 |
/** |
438 |
* Calling await without holding lock throws IllegalMonitorStateException |
439 |
*/ |
440 |
public void testAwait_IllegalMonitor() { |
441 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
442 |
final Condition c = lock.writeLock().newCondition(); |
443 |
try { |
444 |
c.await(); |
445 |
shouldThrow(); |
446 |
} |
447 |
catch (IllegalMonitorStateException success) { |
448 |
} |
449 |
catch (Exception ex) { |
450 |
shouldThrow(); |
451 |
} |
452 |
} |
453 |
|
454 |
/** |
455 |
* Calling signal without holding lock throws IllegalMonitorStateException |
456 |
*/ |
457 |
public void testSignal_IllegalMonitor() { |
458 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
459 |
final Condition c = lock.writeLock().newCondition(); |
460 |
try { |
461 |
c.signal(); |
462 |
shouldThrow(); |
463 |
} |
464 |
catch (IllegalMonitorStateException success) { |
465 |
} |
466 |
catch (Exception ex) { |
467 |
unexpectedException(); |
468 |
} |
469 |
} |
470 |
|
471 |
/** |
472 |
* awaitNanos without a signal times out |
473 |
*/ |
474 |
public void testAwaitNanos_Timeout() { |
475 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
476 |
final Condition c = lock.writeLock().newCondition(); |
477 |
try { |
478 |
lock.writeLock().lock(); |
479 |
long t = c.awaitNanos(100); |
480 |
assertTrue(t <= 0); |
481 |
lock.writeLock().unlock(); |
482 |
} |
483 |
catch (Exception ex) { |
484 |
unexpectedException(); |
485 |
} |
486 |
} |
487 |
|
488 |
|
489 |
/** |
490 |
* timed await without a signal times out |
491 |
*/ |
492 |
public void testAwait_Timeout() { |
493 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
494 |
final Condition c = lock.writeLock().newCondition(); |
495 |
try { |
496 |
lock.writeLock().lock(); |
497 |
assertFalse(c.await(10, TimeUnit.MILLISECONDS)); |
498 |
lock.writeLock().unlock(); |
499 |
} |
500 |
catch (Exception ex) { |
501 |
unexpectedException(); |
502 |
} |
503 |
} |
504 |
|
505 |
/** |
506 |
* awaitUntil without a signal times out |
507 |
*/ |
508 |
public void testAwaitUntil_Timeout() { |
509 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
510 |
final Condition c = lock.writeLock().newCondition(); |
511 |
try { |
512 |
lock.writeLock().lock(); |
513 |
java.util.Date d = new java.util.Date(); |
514 |
assertFalse(c.awaitUntil(new java.util.Date(d.getTime() + 10))); |
515 |
lock.writeLock().unlock(); |
516 |
} |
517 |
catch (Exception ex) { |
518 |
unexpectedException(); |
519 |
} |
520 |
} |
521 |
|
522 |
/** |
523 |
* await returns when signalled |
524 |
*/ |
525 |
public void testAwait() { |
526 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
527 |
final Condition c = lock.writeLock().newCondition(); |
528 |
Thread t = new Thread(new Runnable() { |
529 |
public void run() { |
530 |
try { |
531 |
lock.writeLock().lock(); |
532 |
c.await(); |
533 |
lock.writeLock().unlock(); |
534 |
} |
535 |
catch(InterruptedException e) { |
536 |
threadUnexpectedException(); |
537 |
} |
538 |
} |
539 |
}); |
540 |
|
541 |
try { |
542 |
t.start(); |
543 |
Thread.sleep(SHORT_DELAY_MS); |
544 |
lock.writeLock().lock(); |
545 |
c.signal(); |
546 |
lock.writeLock().unlock(); |
547 |
t.join(SHORT_DELAY_MS); |
548 |
assertFalse(t.isAlive()); |
549 |
} |
550 |
catch (Exception ex) { |
551 |
unexpectedException(); |
552 |
} |
553 |
} |
554 |
|
555 |
/** |
556 |
* awaitUninterruptibly doesn't abort on interrupt |
557 |
*/ |
558 |
public void testAwaitUninterruptibly() { |
559 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
560 |
final Condition c = lock.writeLock().newCondition(); |
561 |
Thread t = new Thread(new Runnable() { |
562 |
public void run() { |
563 |
lock.writeLock().lock(); |
564 |
c.awaitUninterruptibly(); |
565 |
lock.writeLock().unlock(); |
566 |
} |
567 |
}); |
568 |
|
569 |
try { |
570 |
t.start(); |
571 |
Thread.sleep(SHORT_DELAY_MS); |
572 |
t.interrupt(); |
573 |
lock.writeLock().lock(); |
574 |
c.signal(); |
575 |
lock.writeLock().unlock(); |
576 |
assert(t.isInterrupted()); |
577 |
t.join(SHORT_DELAY_MS); |
578 |
assertFalse(t.isAlive()); |
579 |
} |
580 |
catch (Exception ex) { |
581 |
unexpectedException(); |
582 |
} |
583 |
} |
584 |
|
585 |
/** |
586 |
* await is interruptible |
587 |
*/ |
588 |
public void testAwait_Interrupt() { |
589 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
590 |
final Condition c = lock.writeLock().newCondition(); |
591 |
Thread t = new Thread(new Runnable() { |
592 |
public void run() { |
593 |
try { |
594 |
lock.writeLock().lock(); |
595 |
c.await(); |
596 |
lock.writeLock().unlock(); |
597 |
threadShouldThrow(); |
598 |
} |
599 |
catch(InterruptedException success) { |
600 |
} |
601 |
} |
602 |
}); |
603 |
|
604 |
try { |
605 |
t.start(); |
606 |
Thread.sleep(SHORT_DELAY_MS); |
607 |
t.interrupt(); |
608 |
t.join(SHORT_DELAY_MS); |
609 |
assertFalse(t.isAlive()); |
610 |
} |
611 |
catch (Exception ex) { |
612 |
unexpectedException(); |
613 |
} |
614 |
} |
615 |
|
616 |
/** |
617 |
* awaitNanos is interruptible |
618 |
*/ |
619 |
public void testAwaitNanos_Interrupt() { |
620 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
621 |
final Condition c = lock.writeLock().newCondition(); |
622 |
Thread t = new Thread(new Runnable() { |
623 |
public void run() { |
624 |
try { |
625 |
lock.writeLock().lock(); |
626 |
c.awaitNanos(SHORT_DELAY_MS * 2 * 1000000); |
627 |
lock.writeLock().unlock(); |
628 |
threadShouldThrow(); |
629 |
} |
630 |
catch(InterruptedException success) { |
631 |
} |
632 |
} |
633 |
}); |
634 |
|
635 |
try { |
636 |
t.start(); |
637 |
Thread.sleep(SHORT_DELAY_MS); |
638 |
t.interrupt(); |
639 |
t.join(SHORT_DELAY_MS); |
640 |
assertFalse(t.isAlive()); |
641 |
} |
642 |
catch (Exception ex) { |
643 |
unexpectedException(); |
644 |
} |
645 |
} |
646 |
|
647 |
/** |
648 |
* awaitUntil is interruptible |
649 |
*/ |
650 |
public void testAwaitUntil_Interrupt() { |
651 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
652 |
final Condition c = lock.writeLock().newCondition(); |
653 |
Thread t = new Thread(new Runnable() { |
654 |
public void run() { |
655 |
try { |
656 |
lock.writeLock().lock(); |
657 |
java.util.Date d = new java.util.Date(); |
658 |
c.awaitUntil(new java.util.Date(d.getTime() + 10000)); |
659 |
lock.writeLock().unlock(); |
660 |
threadShouldThrow(); |
661 |
} |
662 |
catch(InterruptedException success) { |
663 |
} |
664 |
} |
665 |
}); |
666 |
|
667 |
try { |
668 |
t.start(); |
669 |
Thread.sleep(SHORT_DELAY_MS); |
670 |
t.interrupt(); |
671 |
t.join(SHORT_DELAY_MS); |
672 |
assertFalse(t.isAlive()); |
673 |
} |
674 |
catch (Exception ex) { |
675 |
unexpectedException(); |
676 |
} |
677 |
} |
678 |
|
679 |
/** |
680 |
* signalAll wakes up all threads |
681 |
*/ |
682 |
public void testSignalAll() { |
683 |
final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(); |
684 |
final Condition c = lock.writeLock().newCondition(); |
685 |
Thread t1 = new Thread(new Runnable() { |
686 |
public void run() { |
687 |
try { |
688 |
lock.writeLock().lock(); |
689 |
c.await(); |
690 |
lock.writeLock().unlock(); |
691 |
} |
692 |
catch(InterruptedException e) { |
693 |
threadUnexpectedException(); |
694 |
} |
695 |
} |
696 |
}); |
697 |
|
698 |
Thread t2 = new Thread(new Runnable() { |
699 |
public void run() { |
700 |
try { |
701 |
lock.writeLock().lock(); |
702 |
c.await(); |
703 |
lock.writeLock().unlock(); |
704 |
} |
705 |
catch(InterruptedException e) { |
706 |
threadUnexpectedException(); |
707 |
} |
708 |
} |
709 |
}); |
710 |
|
711 |
try { |
712 |
t1.start(); |
713 |
t2.start(); |
714 |
Thread.sleep(SHORT_DELAY_MS); |
715 |
lock.writeLock().lock(); |
716 |
c.signalAll(); |
717 |
lock.writeLock().unlock(); |
718 |
t1.join(SHORT_DELAY_MS); |
719 |
t2.join(SHORT_DELAY_MS); |
720 |
assertFalse(t1.isAlive()); |
721 |
assertFalse(t2.isAlive()); |
722 |
} |
723 |
catch (Exception ex) { |
724 |
unexpectedException(); |
725 |
} |
726 |
} |
727 |
|
728 |
/** |
729 |
* A serialized lock deserializes as unlocked |
730 |
*/ |
731 |
public void testSerialization() { |
732 |
ReentrantReadWriteLock l = new ReentrantReadWriteLock(); |
733 |
l.readLock().lock(); |
734 |
l.readLock().unlock(); |
735 |
|
736 |
try { |
737 |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
738 |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
739 |
out.writeObject(l); |
740 |
out.close(); |
741 |
|
742 |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
743 |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
744 |
ReentrantReadWriteLock r = (ReentrantReadWriteLock) in.readObject(); |
745 |
r.readLock().lock(); |
746 |
r.readLock().unlock(); |
747 |
} catch(Exception e){ |
748 |
e.printStackTrace(); |
749 |
unexpectedException(); |
750 |
} |
751 |
} |
752 |
|
753 |
|
754 |
} |