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(),

    43                     unsupported);

    44         else

    45             return sp;

    46     }

    47 

    48     protected RdmaPollSelectorImpl(SelectorProvider sp) throws IOException {

    49         super(checkSupported(sp));

    50     }

    51 

    52     protected int poll(long pollAddress, int numfds, int timeout) {

    53         return poll0(pollAddress, numfds, timeout);

    54     }

    55 

    56     private static native int poll0(long pollAddress, int numfds, int timeout);

    57 

    58     static {

    59         java.security.AccessController.doPrivileged(

    60             new java.security.PrivilegedAction<>() {

    61                 public Void run() {

    62                     System.loadLibrary("extnet");

    63                     return null;

    64                 }

    65             });

    66         IOUtil.load();

    67         UnsupportedOperationException uoe = null;

    68         try {

    69             init();

    70         } catch (UnsupportedOperationException e) {

    71             uoe = e;

    72         }

    73         unsupported = uoe;

    74     }

    75 

    76     private static native void init() throws UnsupportedOperationException;

    77 }