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22  */
23 
24 /* @test
25  * @bug 6436220
26  * @summary SelectionKey.attach should atomically set and return the attachment
27  */
28 import java.nio.channels.*;
29 import java.util.concurrent.atomic.*;
30 
31 public class AtomicAttachTest {
main(String[] args)32     public static void main(String[] args) throws Exception {
33         Selector selector = Selector.open();
34         Pipe pipe = Pipe.open();
35         SelectableChannel channel = pipe.sink().configureBlocking(false);
36         final SelectionKey key = channel.register(selector, 0);
37         key.attach(new AtomicBoolean());
38 
39         final AtomicInteger errorCount = new AtomicInteger();
40 
41         Thread t = new Thread() {
42             public void run() {
43                 AtomicBoolean att = new AtomicBoolean();
44                 for (int i=0; i<(10*1000*1000); i++) {
45                     att = (AtomicBoolean)key.attach(att);
46                     // We should have exclusive ownership of att.
47                     if (!att.compareAndSet(false, true) ||
48                         !att.compareAndSet(true, false))
49                     {
50                         errorCount.incrementAndGet();
51                     }
52                 }
53             }
54             {
55                 start();
56                 run();
57             }
58         };
59 
60         t.join();
61 
62         pipe.sink().close();
63         pipe.source().close();
64         selector.close();
65 
66         int count = errorCount.get();
67         if (count > 0) {
68             throw new RuntimeException("Error count:" + count);
69         }
70     }
71 }
72