1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package jdk.internal.net.rdma;
  26 
  27 import java.io.IOException;
  28 import java.nio.channels.spi.SelectorProvider;
  29 import sun.nio.ch.PollSelectorImpl;
  30 import sun.nio.ch.IOUtil;
  31 
  32 /**
  33  * Selector implementation based on poll
  34  */
  35 
  36 public class RdmaPollSelectorImpl extends PollSelectorImpl {
  37 
  38     private static final UnsupportedOperationException unsupported;
  39 
  40     private static final SelectorProvider checkSupported(SelectorProvider sp) {
  41         if (unsupported != null)
  42             throw new UnsupportedOperationException(unsupported.getMessage(), unsupported);
  43         else
  44             return sp;
  45     }
  46 
  47     protected RdmaPollSelectorImpl(SelectorProvider sp) throws IOException {
  48         super(checkSupported(sp));
  49     }
  50 
  51     protected int poll(long pollAddress, int numfds, int timeout) {
  52         return poll0(pollAddress, numfds, timeout);
  53     }
  54 
  55     private static native int poll0(long pollAddress, int numfds, int timeout);
  56 
  57     static {
  58         java.security.AccessController.doPrivileged(
  59             new java.security.PrivilegedAction<>() {
  60                 public Void run() {
  61                     System.loadLibrary("extnet");
  62                     return null;
  63                 }
  64             });
  65         IOUtil.load();
  66         UnsupportedOperationException uoe = null;
  67         try {
  68             init();
  69         } catch (UnsupportedOperationException e) {
  70             uoe = e;
  71         }
  72         unsupported = uoe;
  73     }
  74 
  75     private static native void init() throws UnsupportedOperationException;
  76 }