1 /* |
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.nio.ch; |
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27 |
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28 |
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29 /** |
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30 * Manipulates a native array of pollfd structs on Solaris: |
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31 * |
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32 * typedef struct pollfd { |
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33 * int fd; |
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34 * short events; |
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35 * short revents; |
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36 * } pollfd_t; |
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37 * |
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38 * @author Mike McCloskey |
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39 * @since 1.4 |
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40 */ |
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41 |
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42 public class PollArrayWrapper extends AbstractPollArrayWrapper { |
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43 |
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44 // File descriptor to write for interrupt |
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45 int interruptFD; |
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46 |
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47 PollArrayWrapper(int newSize) { |
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48 newSize = (newSize + 1) * SIZE_POLLFD; |
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49 pollArray = new AllocatedNativeObject(newSize, false); |
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50 pollArrayAddress = pollArray.address(); |
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51 totalChannels = 1; |
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52 } |
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53 |
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54 void initInterrupt(int fd0, int fd1) { |
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55 interruptFD = fd1; |
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56 putDescriptor(0, fd0); |
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57 putEventOps(0, Net.POLLIN); |
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58 putReventOps(0, 0); |
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59 } |
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60 |
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61 void release(int i) { |
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62 return; |
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63 } |
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64 |
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65 void free() { |
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66 pollArray.free(); |
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67 } |
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68 |
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69 /** |
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70 * Prepare another pollfd struct for use. |
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71 */ |
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72 void addEntry(SelChImpl sc) { |
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73 putDescriptor(totalChannels, IOUtil.fdVal(sc.getFD())); |
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74 putEventOps(totalChannels, 0); |
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75 putReventOps(totalChannels, 0); |
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76 totalChannels++; |
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77 } |
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78 |
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79 /** |
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80 * Writes the pollfd entry from the source wrapper at the source index |
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81 * over the entry in the target wrapper at the target index. The source |
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82 * array remains unchanged unless the source array and the target are |
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83 * the same array. |
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84 */ |
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85 static void replaceEntry(PollArrayWrapper source, int sindex, |
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86 PollArrayWrapper target, int tindex) { |
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87 target.putDescriptor(tindex, source.getDescriptor(sindex)); |
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88 target.putEventOps(tindex, source.getEventOps(sindex)); |
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89 target.putReventOps(tindex, source.getReventOps(sindex)); |
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90 } |
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91 |
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92 /** |
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93 * Grows the pollfd array to a size that will accommodate newSize |
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94 * pollfd entries. This method does no checking of the newSize |
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95 * to determine if it is in fact bigger than the old size: it |
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96 * always reallocates an array of the new size. |
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97 */ |
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98 void grow(int newSize) { |
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99 // create new array |
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100 PollArrayWrapper temp = new PollArrayWrapper(newSize); |
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101 |
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102 // Copy over existing entries |
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103 for (int i=0; i<totalChannels; i++) |
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104 replaceEntry(this, i, temp, i); |
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105 |
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106 // Swap new array into pollArray field |
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107 pollArray.free(); |
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108 pollArray = temp.pollArray; |
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109 pollArrayAddress = pollArray.address(); |
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110 } |
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111 |
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112 int poll(int numfds, int offset, long timeout) { |
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113 return poll0(pollArrayAddress + (offset * SIZE_POLLFD), |
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114 numfds, timeout); |
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115 } |
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116 |
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117 public void interrupt() { |
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118 interrupt(interruptFD); |
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119 } |
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120 |
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121 private native int poll0(long pollAddress, int numfds, long timeout); |
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122 |
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123 private static native void interrupt(int fd); |
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124 |
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125 static { |
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126 IOUtil.load(); |
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127 } |
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128 } |
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