8013809: deadlock in SSLSocketImpl between between write and close

Reviewed-by: wetmore

src/share/classes/sun/security/ssl/SSLSocketImpl.java

@@ -169,7 +169,7 @@ final public class SSLSocketImpl extends BaseSSLSocketImpl {
     /*
      * Drives the protocol state machine.
      */
-    private int                 connectionState;
+    private volatile int        connectionState;
 
     /*
      * Flag indicating if the next record we receive MUST be a Finished
@@ -1467,7 +1467,7 @@ final public class SSLSocketImpl extends BaseSSLSocketImpl {
      */
     @Override
     public boolean isClosed() {
-        return getConnectionState() == cs_APP_CLOSED;
+        return connectionState == cs_APP_CLOSED;
     }
 
     /**