test/java/util/concurrent/locks/ReentrantReadWriteLock/Bug6571733.java

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  28  *          lock attempt times out
  29  */
  30 import java.util.concurrent.locks.*;
  31 import java.util.concurrent.*;
  32 
  33 public class Bug6571733 {
  34 
  35     void test(String[] args) throws Throwable {
  36         test(true);
  37         test(false);
  38     }
  39 
  40     void test(boolean fairness) throws Throwable {
  41         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fairness);
  42 
  43         // obtain read lock
  44         lock.readLock().lock();
  45 
  46         Thread thread = new Thread() { public void run() {
  47             try {
  48                 check (! lock.writeLock().tryLock(0, TimeUnit.DAYS));
  49 
  50                 lock.readLock().lock();
  51                 lock.readLock().unlock();
  52             } catch (Throwable t) { unexpected(t); }}};
  53 
  54         thread.start();
  55         thread.join();
  56     }
  57 
  58     //--------------------- Infrastructure ---------------------------
  59     volatile int passed = 0, failed = 0;
  60     void pass() {passed++;}
  61     void fail() {failed++; Thread.dumpStack();}
  62     void fail(String msg) {System.err.println(msg); fail();}
  63     void unexpected(Throwable t) {failed++; t.printStackTrace();}
  64     void check(boolean cond) {if (cond) pass(); else fail();}
  65     public static void main(String[] args) throws Throwable {
  66         new Bug6571733().instanceMain(args);}
  67     void instanceMain(String[] args) throws Throwable {
  68         try {test(args);} catch (Throwable t) {unexpected(t);}


  28  *          lock attempt times out
  29  */
  30 import java.util.concurrent.locks.*;
  31 import java.util.concurrent.*;
  32 
  33 public class Bug6571733 {
  34 
  35     void test(String[] args) throws Throwable {
  36         test(true);
  37         test(false);
  38     }
  39 
  40     void test(boolean fairness) throws Throwable {
  41         final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fairness);
  42 
  43         // obtain read lock
  44         lock.readLock().lock();
  45 
  46         Thread thread = new Thread() { public void run() {
  47             try {
  48                 check(! lock.writeLock().tryLock(0, TimeUnit.DAYS));
  49 
  50                 lock.readLock().lock();
  51                 lock.readLock().unlock();
  52             } catch (Throwable t) { unexpected(t); }}};
  53 
  54         thread.start();
  55         thread.join();
  56     }
  57 
  58     //--------------------- Infrastructure ---------------------------
  59     volatile int passed = 0, failed = 0;
  60     void pass() {passed++;}
  61     void fail() {failed++; Thread.dumpStack();}
  62     void fail(String msg) {System.err.println(msg); fail();}
  63     void unexpected(Throwable t) {failed++; t.printStackTrace();}
  64     void check(boolean cond) {if (cond) pass(); else fail();}
  65     public static void main(String[] args) throws Throwable {
  66         new Bug6571733().instanceMain(args);}
  67     void instanceMain(String[] args) throws Throwable {
  68         try {test(args);} catch (Throwable t) {unexpected(t);}