RFR for JDK-8027212: java/nio/channels/Selector/SelectAfterRead.java fails intermittently

[Eric Wang]

Hi everyone,

I'm working on the bug https://bugs.openjdk.java.net/browse/JDK-8027212. 
after research, it is a test failure.
Root Cause:
The test is based on bad assumption that the ByteServer thread has 
finished to write bytes to client before the client SelectAfterRead 
calls selector.select(TIMEOUT)(TIMEOUT=1000).

Suggested Fix:
Use CountDownLatch to sync up server and client, The fix looks like 
below, Please let me know if you have any comments or suggestions.

server side:
class ByteServer {
*CountDownLatch latch = new CountDownLatch(1);*
       public void start() {
         serverthread = new Thread() {
             public void run() {
                 try {...
                 } finally { *latch.countDown();*}*// count down when 
thread finish to write bytes*
             }
         };
         serverThread.start();
     }
*    public void await() {**latch.await();**}* *// new api for sync up**
*}

client side:
class SelectAfterRead {
     public static void main(String[] args) {
         ...
*        server.await(); // sync up with server**
*        if (sel.select(TIMEOUT) != 1)
             ...
     }
}

Thanks.
Eric
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.openjdk.java.net/pipermail/nio-dev/attachments/20131119/78068d4e/attachment.html