| /* |
| * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.ch; |
| |
| import java.io.IOException; |
| import java.security.AccessController; |
| import java.util.BitSet; |
| import java.util.Map; |
| import java.util.HashMap; |
| import sun.security.action.GetIntegerAction; |
| |
| |
| /** |
| * Manipulates a native array of pollfd structs on Solaris: |
| * |
| * typedef struct pollfd { |
| * int fd; |
| * short events; |
| * short revents; |
| * } pollfd_t; |
| * |
| * @author Mike McCloskey |
| * @since 1.4 |
| */ |
| |
| class DevPollArrayWrapper { |
| |
| // Event masks |
| static final short POLLIN = 0x0001; |
| static final short POLLPRI = 0x0002; |
| static final short POLLOUT = 0x0004; |
| static final short POLLRDNORM = 0x0040; |
| static final short POLLWRNORM = POLLOUT; |
| static final short POLLRDBAND = 0x0080; |
| static final short POLLWRBAND = 0x0100; |
| static final short POLLNORM = POLLRDNORM; |
| static final short POLLERR = 0x0008; |
| static final short POLLHUP = 0x0010; |
| static final short POLLNVAL = 0x0020; |
| static final short POLLREMOVE = 0x0800; |
| static final short POLLCONN = POLLOUT; |
| |
| // Miscellaneous constants |
| static final short SIZE_POLLFD = 8; |
| static final short FD_OFFSET = 0; |
| static final short EVENT_OFFSET = 4; |
| static final short REVENT_OFFSET = 6; |
| |
| // Special value to indicate that an update should be ignored |
| static final byte IGNORE = (byte)-1; |
| |
| // Maximum number of open file descriptors |
| static final int OPEN_MAX = IOUtil.fdLimit(); |
| |
| // Number of pollfd structures to create. |
| // dpwrite/ioctl(DP_POLL) allows up to OPEN_MAX-1 |
| static final int NUM_POLLFDS = Math.min(OPEN_MAX-1, 8192); |
| |
| // Initial size of arrays for fd registration changes |
| private static final int INITIAL_PENDING_UPDATE_SIZE = 64; |
| |
| // maximum size of updatesLow |
| private static final int MAX_UPDATE_ARRAY_SIZE = AccessController.doPrivileged( |
| new GetIntegerAction("sun.nio.ch.maxUpdateArraySize", Math.min(OPEN_MAX, 64*1024))); |
| |
| // The pollfd array for results from devpoll driver |
| private final AllocatedNativeObject pollArray; |
| |
| // Base address of the native pollArray |
| private final long pollArrayAddress; |
| |
| // The fd of the devpoll driver |
| private int wfd; |
| |
| // The fd of the interrupt line going out |
| private int outgoingInterruptFD; |
| |
| // The fd of the interrupt line coming in |
| private int incomingInterruptFD; |
| |
| // The index of the interrupt FD |
| private int interruptedIndex; |
| |
| // Number of updated pollfd entries |
| int updated; |
| |
| // object to synchronize fd registration changes |
| private final Object updateLock = new Object(); |
| |
| // number of file descriptors with registration changes pending |
| private int updateCount; |
| |
| // file descriptors with registration changes pending |
| private int[] updateDescriptors = new int[INITIAL_PENDING_UPDATE_SIZE]; |
| |
| // events for file descriptors with registration changes pending, indexed |
| // by file descriptor and stored as bytes for efficiency reasons. For |
| // file descriptors higher than MAX_UPDATE_ARRAY_SIZE (unlimited case at |
| // least then the update is stored in a map. |
| private final byte[] eventsLow = new byte[MAX_UPDATE_ARRAY_SIZE]; |
| private Map<Integer,Byte> eventsHigh; |
| |
| // Used by release and updateRegistrations to track whether a file |
| // descriptor is registered with /dev/poll. |
| private final BitSet registered = new BitSet(); |
| |
| DevPollArrayWrapper() { |
| int allocationSize = NUM_POLLFDS * SIZE_POLLFD; |
| pollArray = new AllocatedNativeObject(allocationSize, true); |
| pollArrayAddress = pollArray.address(); |
| wfd = init(); |
| if (OPEN_MAX > MAX_UPDATE_ARRAY_SIZE) |
| eventsHigh = new HashMap<>(); |
| } |
| |
| void initInterrupt(int fd0, int fd1) { |
| outgoingInterruptFD = fd1; |
| incomingInterruptFD = fd0; |
| register(wfd, fd0, POLLIN); |
| } |
| |
| void putReventOps(int i, int revent) { |
| int offset = SIZE_POLLFD * i + REVENT_OFFSET; |
| pollArray.putShort(offset, (short)revent); |
| } |
| |
| int getEventOps(int i) { |
| int offset = SIZE_POLLFD * i + EVENT_OFFSET; |
| return pollArray.getShort(offset); |
| } |
| |
| int getReventOps(int i) { |
| int offset = SIZE_POLLFD * i + REVENT_OFFSET; |
| return pollArray.getShort(offset); |
| } |
| |
| int getDescriptor(int i) { |
| int offset = SIZE_POLLFD * i + FD_OFFSET; |
| return pollArray.getInt(offset); |
| } |
| |
| private void setUpdateEvents(int fd, byte events) { |
| if (fd < MAX_UPDATE_ARRAY_SIZE) { |
| eventsLow[fd] = events; |
| } else { |
| eventsHigh.put(Integer.valueOf(fd), Byte.valueOf(events)); |
| } |
| } |
| |
| private byte getUpdateEvents(int fd) { |
| if (fd < MAX_UPDATE_ARRAY_SIZE) { |
| return eventsLow[fd]; |
| } else { |
| Byte result = eventsHigh.get(Integer.valueOf(fd)); |
| // result should never be null |
| return result.byteValue(); |
| } |
| } |
| |
| void setInterest(int fd, int mask) { |
| synchronized (updateLock) { |
| // record the file descriptor and events, expanding the |
| // respective arrays first if necessary. |
| int oldCapacity = updateDescriptors.length; |
| if (updateCount == oldCapacity) { |
| int newCapacity = oldCapacity + INITIAL_PENDING_UPDATE_SIZE; |
| int[] newDescriptors = new int[newCapacity]; |
| System.arraycopy(updateDescriptors, 0, newDescriptors, 0, oldCapacity); |
| updateDescriptors = newDescriptors; |
| } |
| updateDescriptors[updateCount++] = fd; |
| |
| // events are stored as bytes for efficiency reasons |
| byte b = (byte)mask; |
| assert (b == mask) && (b != IGNORE); |
| setUpdateEvents(fd, b); |
| } |
| } |
| |
| void release(int fd) { |
| synchronized (updateLock) { |
| // ignore any pending update for this file descriptor |
| setUpdateEvents(fd, IGNORE); |
| |
| // remove from /dev/poll |
| if (registered.get(fd)) { |
| register(wfd, fd, POLLREMOVE); |
| registered.clear(fd); |
| } |
| } |
| } |
| |
| void closeDevPollFD() throws IOException { |
| FileDispatcherImpl.closeIntFD(wfd); |
| pollArray.free(); |
| } |
| |
| int poll(long timeout) throws IOException { |
| updateRegistrations(); |
| updated = poll0(pollArrayAddress, NUM_POLLFDS, timeout, wfd); |
| for (int i=0; i<updated; i++) { |
| if (getDescriptor(i) == incomingInterruptFD) { |
| interruptedIndex = i; |
| interrupted = true; |
| break; |
| } |
| } |
| return updated; |
| } |
| |
| void updateRegistrations() throws IOException { |
| synchronized (updateLock) { |
| // Populate pollfd array with updated masks |
| int j = 0; |
| int index = 0; |
| while (j < updateCount) { |
| int fd = updateDescriptors[j]; |
| short events = getUpdateEvents(fd); |
| boolean wasRegistered = registered.get(fd); |
| |
| // events = 0 => POLLREMOVE or do-nothing |
| if (events != IGNORE) { |
| if (events == 0) { |
| if (wasRegistered) { |
| events = POLLREMOVE; |
| registered.clear(fd); |
| } else { |
| events = IGNORE; |
| } |
| } else { |
| if (!wasRegistered) { |
| registered.set(fd); |
| } |
| } |
| } |
| |
| // populate pollfd array with updated event |
| if (events != IGNORE) { |
| // insert POLLREMOVE if changing events |
| if (wasRegistered && events != POLLREMOVE) { |
| putPollFD(pollArray, index, fd, POLLREMOVE); |
| index++; |
| } |
| putPollFD(pollArray, index, fd, events); |
| index++; |
| if (index >= (NUM_POLLFDS-1)) { |
| registerMultiple(wfd, pollArray.address(), index); |
| index = 0; |
| } |
| |
| // events for this fd now up to date |
| setUpdateEvents(fd, IGNORE); |
| } |
| j++; |
| } |
| |
| // write any remaining updates |
| if (index > 0) |
| registerMultiple(wfd, pollArray.address(), index); |
| |
| updateCount = 0; |
| } |
| } |
| |
| private void putPollFD(AllocatedNativeObject array, int index, int fd, |
| short event) |
| { |
| int structIndex = SIZE_POLLFD * index; |
| array.putInt(structIndex + FD_OFFSET, fd); |
| array.putShort(structIndex + EVENT_OFFSET, event); |
| array.putShort(structIndex + REVENT_OFFSET, (short)0); |
| } |
| |
| boolean interrupted = false; |
| |
| public void interrupt() { |
| interrupt(outgoingInterruptFD); |
| } |
| |
| public int interruptedIndex() { |
| return interruptedIndex; |
| } |
| |
| boolean interrupted() { |
| return interrupted; |
| } |
| |
| void clearInterrupted() { |
| interrupted = false; |
| } |
| |
| private native int init(); |
| private native void register(int wfd, int fd, int mask); |
| private native void registerMultiple(int wfd, long address, int len) |
| throws IOException; |
| private native int poll0(long pollAddress, int numfds, long timeout, |
| int wfd); |
| private static native void interrupt(int fd); |
| |
| static { |
| IOUtil.load(); |
| } |
| } |