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1 /* |
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2 * Copyright 2008-2009 Sun Microsystems, Inc. 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. Sun designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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22 * CA 95054 USA or visit www.sun.com if you need additional information or |
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23 * have any 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 import java.nio.channels.spi.AsynchronousChannelProvider; |
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29 import java.util.concurrent.RejectedExecutionException; |
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30 import java.io.IOException; |
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31 import sun.misc.Unsafe; |
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32 |
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33 /** |
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34 * AsynchronousChannelGroup implementation based on the Solaris 10 event port |
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35 * framework. |
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36 */ |
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37 |
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38 class SolarisEventPort |
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39 extends Port |
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40 { |
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41 private static final Unsafe unsafe = Unsafe.getUnsafe(); |
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42 private static final int addressSize = unsafe.addressSize(); |
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43 |
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44 private static int dependsArch(int value32, int value64) { |
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45 return (addressSize == 4) ? value32 : value64; |
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46 } |
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47 |
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48 /* |
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49 * typedef struct port_event { |
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50 * int portev_events; |
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51 * ushort_t portev_source; |
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52 * ushort_t portev_pad; |
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53 * uintptr_t portev_object; |
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54 * void *portev_user; |
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55 * } port_event_t; |
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56 */ |
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57 private static final int SIZEOF_PORT_EVENT = dependsArch(16, 24); |
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58 private static final int OFFSETOF_EVENTS = 0; |
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59 private static final int OFFSETOF_SOURCE = 4; |
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60 private static final int OFFSETOF_OBJECT = 8; |
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61 |
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62 // port sources |
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63 private static final short PORT_SOURCE_USER = 3; |
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64 private static final short PORT_SOURCE_FD = 4; |
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65 |
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66 // file descriptor to event port. |
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67 private final int port; |
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68 |
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69 // true when port is closed |
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70 private boolean closed; |
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71 |
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72 SolarisEventPort(AsynchronousChannelProvider provider, ThreadPool pool) |
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73 throws IOException |
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74 { |
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75 super(provider, pool); |
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76 |
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77 // create event port |
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78 this.port = portCreate(); |
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79 } |
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80 |
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81 SolarisEventPort start() { |
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82 startThreads(new EventHandlerTask()); |
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83 return this; |
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84 } |
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85 |
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86 // releass resources |
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87 private void implClose() { |
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88 synchronized (this) { |
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89 if (closed) |
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90 return; |
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91 closed = true; |
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92 } |
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93 portClose(port); |
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94 } |
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95 |
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96 private void wakeup() { |
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97 try { |
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98 portSend(port, 0); |
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99 } catch (IOException x) { |
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100 throw new AssertionError(x); |
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101 } |
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102 } |
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103 |
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104 @Override |
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105 void executeOnHandlerTask(Runnable task) { |
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106 synchronized (this) { |
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107 if (closed) |
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108 throw new RejectedExecutionException(); |
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109 offerTask(task); |
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110 wakeup(); |
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111 } |
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112 } |
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113 |
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114 @Override |
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115 void shutdownHandlerTasks() { |
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116 /* |
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117 * If no tasks are running then just release resources; otherwise |
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118 * write to the one end of the socketpair to wakeup any polling threads.. |
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119 */ |
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120 int nThreads = threadCount(); |
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121 if (nThreads == 0) { |
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122 implClose(); |
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123 } else { |
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124 // send user event to wakeup each thread |
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125 while (nThreads-- > 0) { |
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126 try { |
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127 portSend(port, 0); |
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128 } catch (IOException x) { |
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129 throw new AssertionError(x); |
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130 } |
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131 } |
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132 } |
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133 } |
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134 |
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135 @Override |
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136 void startPoll(int fd, int events) { |
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137 // (re-)associate file descriptor |
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138 // no need to translate events |
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139 try { |
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140 portAssociate(port, PORT_SOURCE_FD, fd, events); |
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141 } catch (IOException x) { |
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142 throw new AssertionError(); // should not happen |
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143 } |
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144 } |
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145 |
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146 /* |
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147 * Task to read a single event from the port and dispatch it to the |
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148 * channel's onEvent handler. |
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149 */ |
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150 private class EventHandlerTask implements Runnable { |
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151 public void run() { |
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152 Invoker.GroupAndInvokeCount myGroupAndInvokeCount = |
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153 Invoker.getGroupAndInvokeCount(); |
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154 boolean replaceMe = false; |
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155 long address = unsafe.allocateMemory(SIZEOF_PORT_EVENT); |
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156 try { |
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157 for (;;) { |
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158 // reset invoke count |
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159 if (myGroupAndInvokeCount != null) |
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160 myGroupAndInvokeCount.resetInvokeCount(); |
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161 |
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162 // wait for I/O completion event |
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163 // A error here is fatal (thread will not be replaced) |
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164 replaceMe = false; |
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165 try { |
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166 portGet(port, address); |
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167 } catch (IOException x) { |
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168 x.printStackTrace(); |
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169 return; |
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170 } |
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171 |
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172 // event source |
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173 short source = unsafe.getShort(address + OFFSETOF_SOURCE); |
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174 if (source != PORT_SOURCE_FD) { |
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175 // user event is trigger to invoke task or shutdown |
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176 if (source == PORT_SOURCE_USER) { |
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177 Runnable task = pollTask(); |
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178 if (task == null) { |
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179 // shutdown request |
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180 return; |
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181 } |
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182 // run task (may throw error/exception) |
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183 replaceMe = true; |
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184 task.run(); |
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185 } |
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186 // ignore |
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187 continue; |
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188 } |
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189 |
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190 // pe->portev_object is file descriptor |
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191 int fd = (int)unsafe.getAddress(address + OFFSETOF_OBJECT); |
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192 // pe->portev_events |
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193 int events = unsafe.getInt(address + OFFSETOF_EVENTS); |
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194 |
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195 // lookup channel |
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196 PollableChannel ch; |
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197 fdToChannelLock.readLock().lock(); |
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198 try { |
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199 ch = fdToChannel.get(fd); |
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200 } finally { |
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201 fdToChannelLock.readLock().unlock(); |
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202 } |
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203 |
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204 // notify channel |
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205 if (ch != null) { |
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206 replaceMe = true; |
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207 // no need to translate events |
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208 ch.onEvent(events); |
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209 } |
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210 } |
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211 } finally { |
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212 // free per-thread resources |
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213 unsafe.freeMemory(address); |
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214 // last task to exit when shutdown release resources |
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215 int remaining = threadExit(this, replaceMe); |
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216 if (remaining == 0 && isShutdown()) |
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217 implClose(); |
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218 } |
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219 } |
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220 } |
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221 |
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222 // -- Native methods -- |
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223 |
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224 private static native void init(); |
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225 |
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226 private static native int portCreate() throws IOException; |
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227 |
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228 private static native void portAssociate(int port, int source, long object, |
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229 int events) throws IOException; |
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230 |
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231 private static native void portGet(int port, long pe) throws IOException; |
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232 |
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233 private static native int portGetn(int port, long address, int max) |
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234 throws IOException; |
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235 |
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236 private static native void portSend(int port, int events) throws IOException; |
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237 |
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238 private static native void portClose(int port); |
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239 |
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240 static { |
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241 Util.load(); |
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242 init(); |
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243 } |
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244 } |