1 /*

     2  * Copyright (c) 2001, 2013, 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 

    26 package sun.nio.ch;

    27 

    28 

    29 /**

    30  * Manipulates a native array of pollfd structs on Solaris:

    31  *

    32  * typedef struct pollfd {

    33  *    int fd;

    34  *    short events;

    35  *    short revents;

    36  * } pollfd_t;

    37  *

    38  * @author Mike McCloskey

    39  * @since 1.4

    40  */

    41 

    42 public class PollArrayWrapper extends AbstractPollArrayWrapper {

    43 

    44     // File descriptor to write for interrupt

    45     int interruptFD;

    46 

    47     PollArrayWrapper(int newSize) {

    48         newSize = (newSize + 1) * SIZE_POLLFD;

    49         pollArray = new AllocatedNativeObject(newSize, false);

    50         pollArrayAddress = pollArray.address();

    51         totalChannels = 1;

    52     }

    53 

    54     void initInterrupt(int fd0, int fd1) {

    55         interruptFD = fd1;

    56         putDescriptor(0, fd0);

    57         putEventOps(0, Net.POLLIN);

    58         putReventOps(0, 0);

    59     }

    60 

    61     void release(int i) {

    62         return;

    63     }

    64 

    65     void free() {

    66         pollArray.free();

    67     }

    68 

    69     /**

    70      * Prepare another pollfd struct for use.

    71      */

    72     void addEntry(SelChImpl sc) {

    73         putDescriptor(totalChannels, IOUtil.fdVal(sc.getFD()));

    74         putEventOps(totalChannels, 0);

    75         putReventOps(totalChannels, 0);

    76         totalChannels++;

    77     }

    78 

    79     /**

    80      * Writes the pollfd entry from the source wrapper at the source index

    81      * over the entry in the target wrapper at the target index. The source

    82      * array remains unchanged unless the source array and the target are

    83      * the same array.

    84      */

    85     static void replaceEntry(PollArrayWrapper source, int sindex,

    86                       PollArrayWrapper target, int tindex) {

    87         target.putDescriptor(tindex, source.getDescriptor(sindex));

    88         target.putEventOps(tindex, source.getEventOps(sindex));

    89         target.putReventOps(tindex, source.getReventOps(sindex));

    90     }

    91 

    92     /**

    93      * Grows the pollfd array to a size that will accommodate newSize

    94      * pollfd entries. This method does no checking of the newSize

    95      * to determine if it is in fact bigger than the old size: it

    96      * always reallocates an array of the new size.

    97      */

    98     void grow(int newSize) {

    99         // create new array

   100         PollArrayWrapper temp = new PollArrayWrapper(newSize);

   101 

   102         // Copy over existing entries

   103         for (int i=0; i<totalChannels; i++)

   104             replaceEntry(this, i, temp, i);

   105 

   106         // Swap new array into pollArray field

   107         pollArray.free();

   108         pollArray = temp.pollArray;

   109         pollArrayAddress = pollArray.address();

   110     }

   111 

   112     int poll(int numfds, int offset, long timeout) {

   113         return poll0(pollArrayAddress + (offset * SIZE_POLLFD),

   114                      numfds, timeout);

   115     }

   116 

   117     public void interrupt() {

   118         interrupt(interruptFD);

   119     }

   120 

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

   122 

   123     private static native void interrupt(int fd);

   124 

   125     static {

   126         IOUtil.load();

   127     }

   128 }