J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2000-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.nio.ch; |
| 27 | |
| 28 | import java.io.FileDescriptor; |
| 29 | import java.io.IOException; |
| 30 | import java.net.*; |
| 31 | import java.nio.ByteBuffer; |
| 32 | import java.nio.channels.*; |
| 33 | import java.nio.channels.spi.*; |
| 34 | |
| 35 | |
| 36 | /** |
| 37 | * An implementation of SocketChannels |
| 38 | */ |
| 39 | |
| 40 | class SocketChannelImpl |
| 41 | extends SocketChannel |
| 42 | implements SelChImpl |
| 43 | { |
| 44 | |
| 45 | // Used to make native read and write calls |
| 46 | private static NativeDispatcher nd; |
| 47 | |
| 48 | // Our file descriptor object |
| 49 | private final FileDescriptor fd; |
| 50 | |
| 51 | // fd value needed for dev/poll. This value will remain valid |
| 52 | // even after the value in the file descriptor object has been set to -1 |
| 53 | private final int fdVal; |
| 54 | |
| 55 | // IDs of native threads doing reads and writes, for signalling |
| 56 | private volatile long readerThread = 0; |
| 57 | private volatile long writerThread = 0; |
| 58 | |
| 59 | // Lock held by current reading or connecting thread |
| 60 | private final Object readLock = new Object(); |
| 61 | |
| 62 | // Lock held by current writing or connecting thread |
| 63 | private final Object writeLock = new Object(); |
| 64 | |
| 65 | // Lock held by any thread that modifies the state fields declared below |
| 66 | // DO NOT invoke a blocking I/O operation while holding this lock! |
| 67 | private final Object stateLock = new Object(); |
| 68 | |
| 69 | // -- The following fields are protected by stateLock |
| 70 | |
| 71 | // State, increases monotonically |
| 72 | private static final int ST_UNINITIALIZED = -1; |
| 73 | private static final int ST_UNCONNECTED = 0; |
| 74 | private static final int ST_PENDING = 1; |
| 75 | private static final int ST_CONNECTED = 2; |
| 76 | private static final int ST_KILLPENDING = 3; |
| 77 | private static final int ST_KILLED = 4; |
| 78 | private int state = ST_UNINITIALIZED; |
| 79 | |
| 80 | // Binding |
| 81 | private SocketAddress localAddress = null; |
| 82 | private SocketAddress remoteAddress = null; |
| 83 | |
| 84 | // Input/Output open |
| 85 | private boolean isInputOpen = true; |
| 86 | private boolean isOutputOpen = true; |
| 87 | private boolean readyToConnect = false; |
| 88 | |
| 89 | // Options, created on demand |
| 90 | private SocketOpts.IP.TCP options = null; |
| 91 | |
| 92 | // Socket adaptor, created on demand |
| 93 | private Socket socket = null; |
| 94 | |
| 95 | // -- End of fields protected by stateLock |
| 96 | |
| 97 | |
| 98 | // Constructor for normal connecting sockets |
| 99 | // |
| 100 | SocketChannelImpl(SelectorProvider sp) throws IOException { |
| 101 | super(sp); |
| 102 | this.fd = Net.socket(true); |
| 103 | this.fdVal = IOUtil.fdVal(fd); |
| 104 | this.state = ST_UNCONNECTED; |
| 105 | } |
| 106 | |
| 107 | // Constructor for sockets obtained from server sockets |
| 108 | // |
| 109 | SocketChannelImpl(SelectorProvider sp, |
| 110 | FileDescriptor fd, InetSocketAddress remote) |
| 111 | throws IOException |
| 112 | { |
| 113 | super(sp); |
| 114 | this.fd = fd; |
| 115 | this.fdVal = IOUtil.fdVal(fd); |
| 116 | this.state = ST_CONNECTED; |
| 117 | this.remoteAddress = remote; |
| 118 | } |
| 119 | |
| 120 | public Socket socket() { |
| 121 | synchronized (stateLock) { |
| 122 | if (socket == null) |
| 123 | socket = SocketAdaptor.create(this); |
| 124 | return socket; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | private boolean ensureReadOpen() throws ClosedChannelException { |
| 129 | synchronized (stateLock) { |
| 130 | if (!isOpen()) |
| 131 | throw new ClosedChannelException(); |
| 132 | if (!isConnected()) |
| 133 | throw new NotYetConnectedException(); |
| 134 | if (!isInputOpen) |
| 135 | return false; |
| 136 | else |
| 137 | return true; |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | private void ensureWriteOpen() throws ClosedChannelException { |
| 142 | synchronized (stateLock) { |
| 143 | if (!isOpen()) |
| 144 | throw new ClosedChannelException(); |
| 145 | if (!isOutputOpen) |
| 146 | throw new ClosedChannelException(); |
| 147 | if (!isConnected()) |
| 148 | throw new NotYetConnectedException(); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | private void readerCleanup() throws IOException { |
| 153 | synchronized (stateLock) { |
| 154 | readerThread = 0; |
| 155 | if (state == ST_KILLPENDING) |
| 156 | kill(); |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | private void writerCleanup() throws IOException { |
| 161 | synchronized (stateLock) { |
| 162 | writerThread = 0; |
| 163 | if (state == ST_KILLPENDING) |
| 164 | kill(); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | public int read(ByteBuffer buf) throws IOException { |
| 169 | |
| 170 | if (buf == null) |
| 171 | throw new NullPointerException(); |
| 172 | |
| 173 | synchronized (readLock) { |
| 174 | if (!ensureReadOpen()) |
| 175 | return -1; |
| 176 | int n = 0; |
| 177 | try { |
| 178 | |
| 179 | // Set up the interruption machinery; see |
| 180 | // AbstractInterruptibleChannel for details |
| 181 | // |
| 182 | begin(); |
| 183 | |
| 184 | synchronized (stateLock) { |
| 185 | if (!isOpen()) { |
| 186 | // Either the current thread is already interrupted, so |
| 187 | // begin() closed the channel, or another thread closed the |
| 188 | // channel since we checked it a few bytecodes ago. In |
| 189 | // either case the value returned here is irrelevant since |
| 190 | // the invocation of end() in the finally block will throw |
| 191 | // an appropriate exception. |
| 192 | // |
| 193 | return 0; |
| 194 | |
| 195 | } |
| 196 | |
| 197 | // Save this thread so that it can be signalled on those |
| 198 | // platforms that require it |
| 199 | // |
| 200 | readerThread = NativeThread.current(); |
| 201 | } |
| 202 | |
| 203 | // Between the previous test of isOpen() and the return of the |
| 204 | // IOUtil.read invocation below, this channel might be closed |
| 205 | // or this thread might be interrupted. We rely upon the |
| 206 | // implicit synchronization point in the kernel read() call to |
| 207 | // make sure that the right thing happens. In either case the |
| 208 | // implCloseSelectableChannel method is ultimately invoked in |
| 209 | // some other thread, so there are three possibilities: |
| 210 | // |
| 211 | // - implCloseSelectableChannel() invokes nd.preClose() |
| 212 | // before this thread invokes read(), in which case the |
| 213 | // read returns immediately with either EOF or an error, |
| 214 | // the latter of which will cause an IOException to be |
| 215 | // thrown. |
| 216 | // |
| 217 | // - implCloseSelectableChannel() invokes nd.preClose() after |
| 218 | // this thread is blocked in read(). On some operating |
| 219 | // systems (e.g., Solaris and Windows) this causes the read |
| 220 | // to return immediately with either EOF or an error |
| 221 | // indication. |
| 222 | // |
| 223 | // - implCloseSelectableChannel() invokes nd.preClose() after |
| 224 | // this thread is blocked in read() but the operating |
| 225 | // system (e.g., Linux) doesn't support preemptive close, |
| 226 | // so implCloseSelectableChannel() proceeds to signal this |
| 227 | // thread, thereby causing the read to return immediately |
| 228 | // with IOStatus.INTERRUPTED. |
| 229 | // |
| 230 | // In all three cases the invocation of end() in the finally |
| 231 | // clause will notice that the channel has been closed and |
| 232 | // throw an appropriate exception (AsynchronousCloseException |
| 233 | // or ClosedByInterruptException) if necessary. |
| 234 | // |
| 235 | // *There is A fourth possibility. implCloseSelectableChannel() |
| 236 | // invokes nd.preClose(), signals reader/writer thred and quickly |
| 237 | // moves on to nd.close() in kill(), which does a real close. |
| 238 | // Then a third thread accepts a new connection, opens file or |
| 239 | // whatever that causes the released "fd" to be recycled. All |
| 240 | // above happens just between our last isOpen() check and the |
| 241 | // next kernel read reached, with the recycled "fd". The solution |
| 242 | // is to postpone the real kill() if there is a reader or/and |
| 243 | // writer thread(s) over there "waiting", leave the cleanup/kill |
| 244 | // to the reader or writer thread. (the preClose() still happens |
| 245 | // so the connection gets cut off as usual). |
| 246 | // |
| 247 | // For socket channels there is the additional wrinkle that |
| 248 | // asynchronous shutdown works much like asynchronous close, |
| 249 | // except that the channel is shutdown rather than completely |
| 250 | // closed. This is analogous to the first two cases above, |
| 251 | // except that the shutdown operation plays the role of |
| 252 | // nd.preClose(). |
| 253 | for (;;) { |
| 254 | n = IOUtil.read(fd, buf, -1, nd, readLock); |
| 255 | if ((n == IOStatus.INTERRUPTED) && isOpen()) { |
| 256 | // The system call was interrupted but the channel |
| 257 | // is still open, so retry |
| 258 | continue; |
| 259 | } |
| 260 | return IOStatus.normalize(n); |
| 261 | } |
| 262 | |
| 263 | } finally { |
| 264 | readerCleanup(); // Clear reader thread |
| 265 | // The end method, which is defined in our superclass |
| 266 | // AbstractInterruptibleChannel, resets the interruption |
| 267 | // machinery. If its argument is true then it returns |
| 268 | // normally; otherwise it checks the interrupt and open state |
| 269 | // of this channel and throws an appropriate exception if |
| 270 | // necessary. |
| 271 | // |
| 272 | // So, if we actually managed to do any I/O in the above try |
| 273 | // block then we pass true to the end method. We also pass |
| 274 | // true if the channel was in non-blocking mode when the I/O |
| 275 | // operation was initiated but no data could be transferred; |
| 276 | // this prevents spurious exceptions from being thrown in the |
| 277 | // rare event that a channel is closed or a thread is |
| 278 | // interrupted at the exact moment that a non-blocking I/O |
| 279 | // request is made. |
| 280 | // |
| 281 | end(n > 0 || (n == IOStatus.UNAVAILABLE)); |
| 282 | |
| 283 | // Extra case for socket channels: Asynchronous shutdown |
| 284 | // |
| 285 | synchronized (stateLock) { |
| 286 | if ((n <= 0) && (!isInputOpen)) |
| 287 | return IOStatus.EOF; |
| 288 | } |
| 289 | |
| 290 | assert IOStatus.check(n); |
| 291 | |
| 292 | } |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | private long read0(ByteBuffer[] bufs) throws IOException { |
| 297 | if (bufs == null) |
| 298 | throw new NullPointerException(); |
| 299 | synchronized (readLock) { |
| 300 | if (!ensureReadOpen()) |
| 301 | return -1; |
| 302 | long n = 0; |
| 303 | try { |
| 304 | begin(); |
| 305 | synchronized (stateLock) { |
| 306 | if (!isOpen()) |
| 307 | return 0; |
| 308 | readerThread = NativeThread.current(); |
| 309 | } |
| 310 | |
| 311 | for (;;) { |
| 312 | n = IOUtil.read(fd, bufs, nd); |
| 313 | if ((n == IOStatus.INTERRUPTED) && isOpen()) |
| 314 | continue; |
| 315 | return IOStatus.normalize(n); |
| 316 | } |
| 317 | } finally { |
| 318 | readerCleanup(); |
| 319 | end(n > 0 || (n == IOStatus.UNAVAILABLE)); |
| 320 | synchronized (stateLock) { |
| 321 | if ((n <= 0) && (!isInputOpen)) |
| 322 | return IOStatus.EOF; |
| 323 | } |
| 324 | assert IOStatus.check(n); |
| 325 | } |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | public long read(ByteBuffer[] dsts, int offset, int length) |
| 330 | throws IOException |
| 331 | { |
| 332 | if ((offset < 0) || (length < 0) || (offset > dsts.length - length)) |
| 333 | throw new IndexOutOfBoundsException(); |
| 334 | // ## Fix IOUtil.write so that we can avoid this array copy |
| 335 | return read0(Util.subsequence(dsts, offset, length)); |
| 336 | } |
| 337 | |
| 338 | public int write(ByteBuffer buf) throws IOException { |
| 339 | if (buf == null) |
| 340 | throw new NullPointerException(); |
| 341 | synchronized (writeLock) { |
| 342 | ensureWriteOpen(); |
| 343 | int n = 0; |
| 344 | try { |
| 345 | begin(); |
| 346 | synchronized (stateLock) { |
| 347 | if (!isOpen()) |
| 348 | return 0; |
| 349 | writerThread = NativeThread.current(); |
| 350 | } |
| 351 | for (;;) { |
| 352 | n = IOUtil.write(fd, buf, -1, nd, writeLock); |
| 353 | if ((n == IOStatus.INTERRUPTED) && isOpen()) |
| 354 | continue; |
| 355 | return IOStatus.normalize(n); |
| 356 | } |
| 357 | } finally { |
| 358 | writerCleanup(); |
| 359 | end(n > 0 || (n == IOStatus.UNAVAILABLE)); |
| 360 | synchronized (stateLock) { |
| 361 | if ((n <= 0) && (!isOutputOpen)) |
| 362 | throw new AsynchronousCloseException(); |
| 363 | } |
| 364 | assert IOStatus.check(n); |
| 365 | } |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | public long write0(ByteBuffer[] bufs) throws IOException { |
| 370 | if (bufs == null) |
| 371 | throw new NullPointerException(); |
| 372 | synchronized (writeLock) { |
| 373 | ensureWriteOpen(); |
| 374 | long n = 0; |
| 375 | try { |
| 376 | begin(); |
| 377 | synchronized (stateLock) { |
| 378 | if (!isOpen()) |
| 379 | return 0; |
| 380 | writerThread = NativeThread.current(); |
| 381 | } |
| 382 | for (;;) { |
| 383 | n = IOUtil.write(fd, bufs, nd); |
| 384 | if ((n == IOStatus.INTERRUPTED) && isOpen()) |
| 385 | continue; |
| 386 | return IOStatus.normalize(n); |
| 387 | } |
| 388 | } finally { |
| 389 | writerCleanup(); |
| 390 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 391 | synchronized (stateLock) { |
| 392 | if ((n <= 0) && (!isOutputOpen)) |
| 393 | throw new AsynchronousCloseException(); |
| 394 | } |
| 395 | assert IOStatus.check(n); |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | public long write(ByteBuffer[] srcs, int offset, int length) |
| 401 | throws IOException |
| 402 | { |
| 403 | if ((offset < 0) || (length < 0) || (offset > srcs.length - length)) |
| 404 | throw new IndexOutOfBoundsException(); |
| 405 | // ## Fix IOUtil.write so that we can avoid this array copy |
| 406 | return write0(Util.subsequence(srcs, offset, length)); |
| 407 | } |
| 408 | |
| 409 | protected void implConfigureBlocking(boolean block) throws IOException { |
| 410 | IOUtil.configureBlocking(fd, block); |
| 411 | } |
| 412 | |
| 413 | public SocketOpts options() { |
| 414 | synchronized (stateLock) { |
| 415 | if (options == null) { |
| 416 | SocketOptsImpl.Dispatcher d |
| 417 | = new SocketOptsImpl.Dispatcher() { |
| 418 | int getInt(int opt) throws IOException { |
| 419 | return Net.getIntOption(fd, opt); |
| 420 | } |
| 421 | void setInt(int opt, int arg) |
| 422 | throws IOException |
| 423 | { |
| 424 | Net.setIntOption(fd, opt, arg); |
| 425 | } |
| 426 | }; |
| 427 | options = new SocketOptsImpl.IP.TCP(d); |
| 428 | } |
| 429 | return options; |
| 430 | } |
| 431 | } |
| 432 | |
| 433 | public boolean isBound() { |
| 434 | synchronized (stateLock) { |
| 435 | if (state == ST_CONNECTED) |
| 436 | return true; |
| 437 | return localAddress != null; |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | public SocketAddress localAddress() { |
| 442 | synchronized (stateLock) { |
| 443 | if (state == ST_CONNECTED && |
| 444 | (localAddress == null || |
| 445 | ((InetSocketAddress)localAddress).getAddress().isAnyLocalAddress())) { |
| 446 | // Socket was not bound before connecting or |
| 447 | // Socket was bound with an "anyLocalAddress" |
| 448 | localAddress = Net.localAddress(fd); |
| 449 | } |
| 450 | return localAddress; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | public SocketAddress remoteAddress() { |
| 455 | synchronized (stateLock) { |
| 456 | return remoteAddress; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | public void bind(SocketAddress local) throws IOException { |
| 461 | synchronized (readLock) { |
| 462 | synchronized (writeLock) { |
| 463 | synchronized (stateLock) { |
| 464 | ensureOpenAndUnconnected(); |
| 465 | if (localAddress != null) |
| 466 | throw new AlreadyBoundException(); |
| 467 | InetSocketAddress isa = Net.checkAddress(local); |
| 468 | Net.bind(fd, isa.getAddress(), isa.getPort()); |
| 469 | localAddress = Net.localAddress(fd); |
| 470 | } |
| 471 | } |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | public boolean isConnected() { |
| 476 | synchronized (stateLock) { |
| 477 | return (state == ST_CONNECTED); |
| 478 | } |
| 479 | } |
| 480 | |
| 481 | public boolean isConnectionPending() { |
| 482 | synchronized (stateLock) { |
| 483 | return (state == ST_PENDING); |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | void ensureOpenAndUnconnected() throws IOException { // package-private |
| 488 | synchronized (stateLock) { |
| 489 | if (!isOpen()) |
| 490 | throw new ClosedChannelException(); |
| 491 | if (state == ST_CONNECTED) |
| 492 | throw new AlreadyConnectedException(); |
| 493 | if (state == ST_PENDING) |
| 494 | throw new ConnectionPendingException(); |
| 495 | } |
| 496 | } |
| 497 | |
| 498 | public boolean connect(SocketAddress sa) throws IOException { |
| 499 | int trafficClass = 0; // ## Pick up from options |
| 500 | int localPort = 0; |
| 501 | |
| 502 | synchronized (readLock) { |
| 503 | synchronized (writeLock) { |
| 504 | ensureOpenAndUnconnected(); |
| 505 | InetSocketAddress isa = Net.checkAddress(sa); |
| 506 | SecurityManager sm = System.getSecurityManager(); |
| 507 | if (sm != null) |
| 508 | sm.checkConnect(isa.getAddress().getHostAddress(), |
| 509 | isa.getPort()); |
| 510 | synchronized (blockingLock()) { |
| 511 | int n = 0; |
| 512 | try { |
| 513 | try { |
| 514 | begin(); |
| 515 | synchronized (stateLock) { |
| 516 | if (!isOpen()) { |
| 517 | return false; |
| 518 | } |
| 519 | readerThread = NativeThread.current(); |
| 520 | } |
| 521 | for (;;) { |
| 522 | InetAddress ia = isa.getAddress(); |
| 523 | if (ia.isAnyLocalAddress()) |
| 524 | ia = InetAddress.getLocalHost(); |
| 525 | n = Net.connect(fd, |
| 526 | ia, |
| 527 | isa.getPort(), |
| 528 | trafficClass); |
| 529 | if ( (n == IOStatus.INTERRUPTED) |
| 530 | && isOpen()) |
| 531 | continue; |
| 532 | break; |
| 533 | } |
| 534 | } finally { |
| 535 | readerCleanup(); |
| 536 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 537 | assert IOStatus.check(n); |
| 538 | } |
| 539 | } catch (IOException x) { |
| 540 | // If an exception was thrown, close the channel after |
| 541 | // invoking end() so as to avoid bogus |
| 542 | // AsynchronousCloseExceptions |
| 543 | close(); |
| 544 | throw x; |
| 545 | } |
| 546 | synchronized (stateLock) { |
| 547 | remoteAddress = isa; |
| 548 | if (n > 0) { |
| 549 | |
| 550 | // Connection succeeded; disallow further |
| 551 | // invocation |
| 552 | state = ST_CONNECTED; |
| 553 | return true; |
| 554 | } |
| 555 | // If nonblocking and no exception then connection |
| 556 | // pending; disallow another invocation |
| 557 | if (!isBlocking()) |
| 558 | state = ST_PENDING; |
| 559 | else |
| 560 | assert false; |
| 561 | } |
| 562 | } |
| 563 | return false; |
| 564 | } |
| 565 | } |
| 566 | } |
| 567 | |
| 568 | public boolean finishConnect() throws IOException { |
| 569 | synchronized (readLock) { |
| 570 | synchronized (writeLock) { |
| 571 | synchronized (stateLock) { |
| 572 | if (!isOpen()) |
| 573 | throw new ClosedChannelException(); |
| 574 | if (state == ST_CONNECTED) |
| 575 | return true; |
| 576 | if (state != ST_PENDING) |
| 577 | throw new NoConnectionPendingException(); |
| 578 | } |
| 579 | int n = 0; |
| 580 | try { |
| 581 | try { |
| 582 | begin(); |
| 583 | synchronized (blockingLock()) { |
| 584 | synchronized (stateLock) { |
| 585 | if (!isOpen()) { |
| 586 | return false; |
| 587 | } |
| 588 | readerThread = NativeThread.current(); |
| 589 | } |
| 590 | if (!isBlocking()) { |
| 591 | for (;;) { |
| 592 | n = checkConnect(fd, false, |
| 593 | readyToConnect); |
| 594 | if ( (n == IOStatus.INTERRUPTED) |
| 595 | && isOpen()) |
| 596 | continue; |
| 597 | break; |
| 598 | } |
| 599 | } else { |
| 600 | for (;;) { |
| 601 | n = checkConnect(fd, true, |
| 602 | readyToConnect); |
| 603 | if (n == 0) { |
| 604 | // Loop in case of |
| 605 | // spurious notifications |
| 606 | continue; |
| 607 | } |
| 608 | if ( (n == IOStatus.INTERRUPTED) |
| 609 | && isOpen()) |
| 610 | continue; |
| 611 | break; |
| 612 | } |
| 613 | } |
| 614 | } |
| 615 | } finally { |
| 616 | synchronized (stateLock) { |
| 617 | readerThread = 0; |
| 618 | if (state == ST_KILLPENDING) { |
| 619 | kill(); |
| 620 | // poll()/getsockopt() does not report |
| 621 | // error (throws exception, with n = 0) |
| 622 | // on Linux platform after dup2 and |
| 623 | // signal-wakeup. Force n to 0 so the |
| 624 | // end() can throw appropriate exception |
| 625 | n = 0; |
| 626 | } |
| 627 | } |
| 628 | end((n > 0) || (n == IOStatus.UNAVAILABLE)); |
| 629 | assert IOStatus.check(n); |
| 630 | } |
| 631 | } catch (IOException x) { |
| 632 | // If an exception was thrown, close the channel after |
| 633 | // invoking end() so as to avoid bogus |
| 634 | // AsynchronousCloseExceptions |
| 635 | close(); |
| 636 | throw x; |
| 637 | } |
| 638 | if (n > 0) { |
| 639 | synchronized (stateLock) { |
| 640 | state = ST_CONNECTED; |
| 641 | } |
| 642 | return true; |
| 643 | } |
| 644 | return false; |
| 645 | } |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | public final static int SHUT_RD = 0; |
| 650 | public final static int SHUT_WR = 1; |
| 651 | public final static int SHUT_RDWR = 2; |
| 652 | |
| 653 | public void shutdownInput() throws IOException { |
| 654 | synchronized (stateLock) { |
| 655 | if (!isOpen()) |
| 656 | throw new ClosedChannelException(); |
| 657 | isInputOpen = false; |
| 658 | shutdown(fd, SHUT_RD); |
| 659 | if (readerThread != 0) |
| 660 | NativeThread.signal(readerThread); |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | public void shutdownOutput() throws IOException { |
| 665 | synchronized (stateLock) { |
| 666 | if (!isOpen()) |
| 667 | throw new ClosedChannelException(); |
| 668 | isOutputOpen = false; |
| 669 | shutdown(fd, SHUT_WR); |
| 670 | if (writerThread != 0) |
| 671 | NativeThread.signal(writerThread); |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | public boolean isInputOpen() { |
| 676 | synchronized (stateLock) { |
| 677 | return isInputOpen; |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | public boolean isOutputOpen() { |
| 682 | synchronized (stateLock) { |
| 683 | return isOutputOpen; |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | // AbstractInterruptibleChannel synchronizes invocations of this method |
| 688 | // using AbstractInterruptibleChannel.closeLock, and also ensures that this |
| 689 | // method is only ever invoked once. Before we get to this method, isOpen |
| 690 | // (which is volatile) will have been set to false. |
| 691 | // |
| 692 | protected void implCloseSelectableChannel() throws IOException { |
| 693 | synchronized (stateLock) { |
| 694 | isInputOpen = false; |
| 695 | isOutputOpen = false; |
| 696 | |
| 697 | // Close the underlying file descriptor and dup it to a known fd |
| 698 | // that's already closed. This prevents other operations on this |
| 699 | // channel from using the old fd, which might be recycled in the |
| 700 | // meantime and allocated to an entirely different channel. |
| 701 | // |
| 702 | nd.preClose(fd); |
| 703 | |
| 704 | // Signal native threads, if needed. If a target thread is not |
| 705 | // currently blocked in an I/O operation then no harm is done since |
| 706 | // the signal handler doesn't actually do anything. |
| 707 | // |
| 708 | if (readerThread != 0) |
| 709 | NativeThread.signal(readerThread); |
| 710 | |
| 711 | if (writerThread != 0) |
| 712 | NativeThread.signal(writerThread); |
| 713 | |
| 714 | // If this channel is not registered then it's safe to close the fd |
| 715 | // immediately since we know at this point that no thread is |
| 716 | // blocked in an I/O operation upon the channel and, since the |
| 717 | // channel is marked closed, no thread will start another such |
| 718 | // operation. If this channel is registered then we don't close |
| 719 | // the fd since it might be in use by a selector. In that case |
| 720 | // closing this channel caused its keys to be cancelled, so the |
| 721 | // last selector to deregister a key for this channel will invoke |
| 722 | // kill() to close the fd. |
| 723 | // |
| 724 | if (!isRegistered()) |
| 725 | kill(); |
| 726 | } |
| 727 | } |
| 728 | |
| 729 | public void kill() throws IOException { |
| 730 | synchronized (stateLock) { |
| 731 | if (state == ST_KILLED) |
| 732 | return; |
| 733 | if (state == ST_UNINITIALIZED) { |
| 734 | state = ST_KILLED; |
| 735 | return; |
| 736 | } |
| 737 | assert !isOpen() && !isRegistered(); |
| 738 | |
| 739 | // Postpone the kill if there is a waiting reader |
| 740 | // or writer thread. See the comments in read() for |
| 741 | // more detailed explanation. |
| 742 | if (readerThread == 0 && writerThread == 0) { |
| 743 | nd.close(fd); |
| 744 | state = ST_KILLED; |
| 745 | } else { |
| 746 | state = ST_KILLPENDING; |
| 747 | } |
| 748 | } |
| 749 | } |
| 750 | |
| 751 | /** |
| 752 | * Translates native poll revent ops into a ready operation ops |
| 753 | */ |
| 754 | public boolean translateReadyOps(int ops, int initialOps, |
| 755 | SelectionKeyImpl sk) { |
| 756 | int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes |
| 757 | int oldOps = sk.nioReadyOps(); |
| 758 | int newOps = initialOps; |
| 759 | |
| 760 | if ((ops & PollArrayWrapper.POLLNVAL) != 0) { |
| 761 | // This should only happen if this channel is pre-closed while a |
| 762 | // selection operation is in progress |
| 763 | // ## Throw an error if this channel has not been pre-closed |
| 764 | return false; |
| 765 | } |
| 766 | |
| 767 | if ((ops & (PollArrayWrapper.POLLERR |
| 768 | | PollArrayWrapper.POLLHUP)) != 0) { |
| 769 | newOps = intOps; |
| 770 | sk.nioReadyOps(newOps); |
| 771 | // No need to poll again in checkConnect, |
| 772 | // the error will be detected there |
| 773 | readyToConnect = true; |
| 774 | return (newOps & ~oldOps) != 0; |
| 775 | } |
| 776 | |
| 777 | if (((ops & PollArrayWrapper.POLLIN) != 0) && |
| 778 | ((intOps & SelectionKey.OP_READ) != 0) && |
| 779 | (state == ST_CONNECTED)) |
| 780 | newOps |= SelectionKey.OP_READ; |
| 781 | |
| 782 | if (((ops & PollArrayWrapper.POLLCONN) != 0) && |
| 783 | ((intOps & SelectionKey.OP_CONNECT) != 0) && |
| 784 | ((state == ST_UNCONNECTED) || (state == ST_PENDING))) { |
| 785 | newOps |= SelectionKey.OP_CONNECT; |
| 786 | readyToConnect = true; |
| 787 | } |
| 788 | |
| 789 | if (((ops & PollArrayWrapper.POLLOUT) != 0) && |
| 790 | ((intOps & SelectionKey.OP_WRITE) != 0) && |
| 791 | (state == ST_CONNECTED)) |
| 792 | newOps |= SelectionKey.OP_WRITE; |
| 793 | |
| 794 | sk.nioReadyOps(newOps); |
| 795 | return (newOps & ~oldOps) != 0; |
| 796 | } |
| 797 | |
| 798 | public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) { |
| 799 | return translateReadyOps(ops, sk.nioReadyOps(), sk); |
| 800 | } |
| 801 | |
| 802 | public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) { |
| 803 | return translateReadyOps(ops, 0, sk); |
| 804 | } |
| 805 | |
| 806 | /** |
| 807 | * Translates an interest operation set into a native poll event set |
| 808 | */ |
| 809 | public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) { |
| 810 | int newOps = 0; |
| 811 | if ((ops & SelectionKey.OP_READ) != 0) |
| 812 | newOps |= PollArrayWrapper.POLLIN; |
| 813 | if ((ops & SelectionKey.OP_WRITE) != 0) |
| 814 | newOps |= PollArrayWrapper.POLLOUT; |
| 815 | if ((ops & SelectionKey.OP_CONNECT) != 0) |
| 816 | newOps |= PollArrayWrapper.POLLCONN; |
| 817 | sk.selector.putEventOps(sk, newOps); |
| 818 | } |
| 819 | |
| 820 | public FileDescriptor getFD() { |
| 821 | return fd; |
| 822 | } |
| 823 | |
| 824 | public int getFDVal() { |
| 825 | return fdVal; |
| 826 | } |
| 827 | |
| 828 | public String toString() { |
| 829 | StringBuffer sb = new StringBuffer(); |
| 830 | sb.append(this.getClass().getSuperclass().getName()); |
| 831 | sb.append('['); |
| 832 | if (!isOpen()) |
| 833 | sb.append("closed"); |
| 834 | else { |
| 835 | synchronized (stateLock) { |
| 836 | switch (state) { |
| 837 | case ST_UNCONNECTED: |
| 838 | sb.append("unconnected"); |
| 839 | break; |
| 840 | case ST_PENDING: |
| 841 | sb.append("connection-pending"); |
| 842 | break; |
| 843 | case ST_CONNECTED: |
| 844 | sb.append("connected"); |
| 845 | if (!isInputOpen) |
| 846 | sb.append(" ishut"); |
| 847 | if (!isOutputOpen) |
| 848 | sb.append(" oshut"); |
| 849 | break; |
| 850 | } |
| 851 | if (localAddress() != null) { |
| 852 | sb.append(" local="); |
| 853 | sb.append(localAddress().toString()); |
| 854 | } |
| 855 | if (remoteAddress() != null) { |
| 856 | sb.append(" remote="); |
| 857 | sb.append(remoteAddress().toString()); |
| 858 | } |
| 859 | } |
| 860 | } |
| 861 | sb.append(']'); |
| 862 | return sb.toString(); |
| 863 | } |
| 864 | |
| 865 | |
| 866 | // -- Native methods -- |
| 867 | |
| 868 | private static native int checkConnect(FileDescriptor fd, |
| 869 | boolean block, boolean ready) |
| 870 | throws IOException; |
| 871 | |
| 872 | private static native void shutdown(FileDescriptor fd, int how) |
| 873 | throws IOException; |
| 874 | |
| 875 | static { |
| 876 | Util.load(); |
| 877 | nd = new SocketDispatcher(); |
| 878 | } |
| 879 | |
| 880 | } |