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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/nio/KqueueSelectorImpl.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/nio/KqueueSelectorImpl.java')
-rw-r--r-- | libjava/classpath/gnu/java/nio/KqueueSelectorImpl.java | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/nio/KqueueSelectorImpl.java b/libjava/classpath/gnu/java/nio/KqueueSelectorImpl.java new file mode 100644 index 000000000..e696c0d72 --- /dev/null +++ b/libjava/classpath/gnu/java/nio/KqueueSelectorImpl.java @@ -0,0 +1,527 @@ +/* KqueueSelectorImpl.java -- Selector for systems with kqueue event notification. + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.nio; + + +import java.io.IOException; +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.nio.channels.ClosedSelectorException; +import java.nio.channels.SelectableChannel; +import java.nio.channels.SelectionKey; +import java.nio.channels.Selector; +import java.nio.channels.spi.AbstractSelectableChannel; +import java.nio.channels.spi.AbstractSelector; +import java.nio.channels.spi.SelectorProvider; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.Map; +import java.util.Set; + +/** + * A {@link Selector} implementation that uses the <code>kqueue</code> + * event notification facility. + * + * @author Casey Marshall (csm@gnu.org) + */ +public class KqueueSelectorImpl extends AbstractSelector +{ + // Prepended underscore to field name to make it distinct + // from the method with the similar name. + private static final int _sizeof_struct_kevent; + + private static final int MAX_DOUBLING_CAPACITY = 16384; + private static final int CAP_INCREMENT = 1024; + private static final int INITIAL_CAPACITY; + + static + { + try + { + System.loadLibrary("javanio"); + } + catch (Exception x) + { + x.printStackTrace(); + } + + if (kqueue_supported ()) + _sizeof_struct_kevent = sizeof_struct_kevent(); + else + _sizeof_struct_kevent = -1; + INITIAL_CAPACITY = 16 * _sizeof_struct_kevent; + } + + /** + * Tell if kqueue-based selectors are supported on this system. + * + * @return True if this system has kqueue support, and support for it was + * compiled in to Classpath. + */ + public static native boolean kqueue_supported(); + + /* Our native file descriptor. */ + private int kq; + + private HashMap/*<Integer,KqueueSelectionKeyImpl>*/ keys; + private HashSet/*<KqueueSelectionKeyImpl>*/ selected; + private Thread blockedThread; + private ByteBuffer events; + + private static final int OP_ACCEPT = SelectionKey.OP_ACCEPT; + private static final int OP_CONNECT = SelectionKey.OP_CONNECT; + private static final int OP_READ = SelectionKey.OP_READ; + private static final int OP_WRITE = SelectionKey.OP_WRITE; + + public KqueueSelectorImpl(SelectorProvider provider) throws IOException + { + super(provider); + kq = implOpen(); + keys = new HashMap/*<KqueueSelectionKeyImpl>*/(); + events = ByteBuffer.allocateDirect(INITIAL_CAPACITY); + } + + protected void implCloseSelector() throws IOException + { + implClose(kq); + kq = -1; + } + + /* (non-Javadoc) + * @see java.nio.channels.Selector#keys() + */ + public Set keys() + { + if (!isOpen()) + throw new ClosedSelectorException(); + + return new HashSet(keys.values()); + } + + /* (non-Javadoc) + * @see java.nio.channels.Selector#select() + */ + public int select() throws IOException + { + return doSelect(-1); + } + + /* (non-Javadoc) + * @see java.nio.channels.Selector#select(long) + */ + public int select(long timeout) throws IOException + { + if (timeout == 0) + timeout = -1; + return doSelect(timeout); + } + + /* (non-Javadoc) + * @see java.nio.channels.Selector#selectedKeys() + */ + public Set selectedKeys() + { + if (!isOpen()) + throw new ClosedSelectorException(); + + return selected; + } + + /* (non-Javadoc) + * @see java.nio.channels.Selector#selectNow() + */ + public int selectNow() throws IOException + { + return doSelect(0); + } + + /* (non-Javadoc) + * @see java.nio.channels.Selector#wakeup() + */ + public Selector wakeup() + { + if (blockedThread != null) + blockedThread.interrupt(); + return this; + } + + public String toString() + { + return super.toString() + " [ fd: " + kq + " ]"; + } + + public boolean equals(Object o) + { + if (!(o instanceof KqueueSelectorImpl)) + return false; + + return ((KqueueSelectorImpl) o).kq == kq; + } + + int doSelect(long timeout) throws IOException + { + Set cancelled = cancelledKeys(); + synchronized (cancelled) + { + synchronized (keys) + { + for (Iterator it = cancelled.iterator(); it.hasNext(); ) + { + KqueueSelectionKeyImpl key = (KqueueSelectionKeyImpl) it.next(); + key.interestOps = 0; + } + + int events_size = (2 * _sizeof_struct_kevent) * keys.size(); + int num_events = 0; + + for (Iterator it = keys.entrySet().iterator(); it.hasNext(); ) + { + Map.Entry e = (Map.Entry) it.next(); + KqueueSelectionKeyImpl key = (KqueueSelectionKeyImpl) e.getValue(); + + SelectableChannel ch = key.channel(); + if (ch instanceof VMChannelOwner) + { + if (!((VMChannelOwner) ch).getVMChannel().getState().isValid()) + { + // closed channel; removed from kqueue automatically. + it.remove(); + continue; + } + } + + // If this key is registering a read filter, add it to the buffer. + if (key.needCommitRead()) + { + kevent_set(events, num_events, key.fd, + key.interestOps & (OP_READ | OP_ACCEPT), + key.activeOps & (OP_READ | OP_ACCEPT), key.key); + num_events++; + } + + // If this key is registering a write filter, add it to the buffer. + if (key.needCommitWrite()) + { + kevent_set(events, num_events, key.fd, + key.interestOps & (OP_WRITE | OP_CONNECT), + key.activeOps & (OP_WRITE | OP_CONNECT), key.key); + num_events++; + } + } + events.rewind().limit(events.capacity()); + + //System.out.println("dump of keys to select:"); + //dump_selection_keys(events.duplicate()); + + int n = 0; + try + { + //System.out.println("[" + kq + "] kevent enter selecting from " + keys.size()); + begin(); + blockedThread = Thread.currentThread(); + if (blockedThread.isInterrupted()) + timeout = 0; + n = kevent(kq, events, num_events, + events.capacity() / _sizeof_struct_kevent, timeout); + } + finally + { + end(); + blockedThread = null; + Thread.interrupted(); + //System.out.println("[" + kq + "kevent exit selected " + n); + } + + //System.out.println("dump of keys selected:"); + //dump_selection_keys((ByteBuffer) events.duplicate().limit(n * _sizeof_struct_kevent)); + + // Commit the operations we've just added in the call to kevent. + for (Iterator it = keys.values().iterator(); it.hasNext(); ) + { + KqueueSelectionKeyImpl key = (KqueueSelectionKeyImpl) it.next(); + key.activeOps = key.interestOps; + } + + selected = new HashSet/*<KqueueSelectionKeyImpl>*/(n); + int x = 0; + for (int i = 0; i < n; i++) + { + events.position(x).limit(x + _sizeof_struct_kevent); + x += _sizeof_struct_kevent; + int y = fetch_key(events.slice()); + KqueueSelectionKeyImpl key = + (KqueueSelectionKeyImpl) keys.get(new Integer(y)); + + if (key == null) + { + System.out.println("WARNING! no key found for selected key " + y); + continue; + } + // Keys that have been cancelled may be returned here; don't + // add them to the selected set. + if (!key.isValid()) + continue; + key.readyOps = ready_ops(events.slice(), key.interestOps); + selected.add(key); + } + + // Finally, remove the cancelled keys. + for (Iterator it = cancelled.iterator(); it.hasNext(); ) + { + KqueueSelectionKeyImpl key = (KqueueSelectionKeyImpl) it.next(); + keys.remove(new Integer(key.key)); + deregister(key); + it.remove(); + } + + reallocateBuffer(); + + return selected.size(); + } + } + } + + protected SelectionKey register(AbstractSelectableChannel channel, + int interestOps, + Object attachment) + { + int native_fd = -1; + try + { + if (channel instanceof VMChannelOwner) + native_fd = ((VMChannelOwner) channel).getVMChannel() + .getState().getNativeFD(); + else + throw new IllegalArgumentException("cannot handle channel type " + + channel.getClass().getName()); + } + catch (IOException ioe) + { + throw new IllegalArgumentException("channel is closed or invalid"); + } + + KqueueSelectionKeyImpl result = new KqueueSelectionKeyImpl(this, channel); + result.interestOps = interestOps; + result.attach(attachment); + result.fd = native_fd; + result.key = System.identityHashCode(result); + synchronized (keys) + { + while (keys.containsKey(new Integer(result.key))) + result.key++; + keys.put(new Integer(result.key), result); + reallocateBuffer(); + } + return result; + } + + void setInterestOps(KqueueSelectionKeyImpl key, int ops) + { + synchronized (keys) + { + key.interestOps = ops; + } + } + + /** + * Reallocate the events buffer. This is the destination buffer for + * events returned by kevent. This method will: + * + * * Grow the buffer if there is insufficent space for all registered + * events. + * * Shrink the buffer if it is more than twice the size needed. + * + */ + private void reallocateBuffer() + { + synchronized (keys) + { + if (events.capacity() < (2 * _sizeof_struct_kevent) * keys.size()) + { + int cap = events.capacity(); + if (cap >= MAX_DOUBLING_CAPACITY) + cap += CAP_INCREMENT; + else + cap = cap << 1; + + events = ByteBuffer.allocateDirect(cap); + } + else if (events.capacity() > 4 * (_sizeof_struct_kevent) * keys.size() + 1 + && events.capacity() > INITIAL_CAPACITY) + { + int cap = events.capacity(); + cap = cap >>> 1; + events = ByteBuffer.allocateDirect(cap); + } + } + } + + //synchronized void updateOps(KqueueSelectionKeyImpl key, int interestOps) + //{ + // updateOps(key, interestOps, 0, false); + //} + + /*void updateOps(KqueueSelectionKeyImpl key, int interestOps, + int activeOps, int fd) + { + //System.out.println(">> updating kqueue selection key:"); + //dump_selection_keys(key.nstate.duplicate()); + //System.out.println("<<"); + synchronized (keys) + { + kevent_set(key.nstate, fd, interestOps, activeOps, key.key); + } + //System.out.println(">> updated kqueue selection key:"); + //dump_selection_keys(key.nstate.duplicate()); + //System.out.println("<<"); + }*/ + + private void dump_selection_keys(ByteBuffer keys) + { + // WARNING! This method is not guaranteed to be portable! This works + // on darwin/x86, but the sizeof and offsetof these fields may be + // different on other platforms! + int i = 0; + keys.order(ByteOrder.nativeOrder()); + while (keys.hasRemaining()) + { + System.out.println("struct kevent { ident: " + + Integer.toString(keys.getInt()) + + " filter: " + + Integer.toHexString(keys.getShort() & 0xFFFF) + + " flags: " + + Integer.toHexString(keys.getShort() & 0xFFFF) + + " fflags: " + + Integer.toHexString(keys.getInt()) + + " data: " + + Integer.toHexString(keys.getInt()) + + " udata: " + + Integer.toHexString(keys.getInt()) + + " }"); + } + } + + /** + * Return the size of a <code>struct kevent</code> on this system. + * + * @return The size of <code>struct kevent</code>. + */ + private static native int sizeof_struct_kevent(); + + /** + * Opens a kqueue descriptor. + * + * @return The new kqueue descriptor. + * @throws IOException If opening fails. + */ + private static native int implOpen() throws IOException; + + /** + * Closes the kqueue file descriptor. + * + * @param kq The kqueue file descriptor. + * @throws IOException + */ + private static native void implClose(int kq) throws IOException; + + /** + * Initialize the specified native state for the given interest ops. + * + * @param nstate The native state structures; in this buffer should be + * the <code>struct kevent</code>s created for a key. + * @param fd The file descriptor. If 0, the native FD is unmodified. + * @param interestOps The operations to enable. + * @param key A unique key that will reference the associated key later. + * @param delete Set to true if this event should be deleted from the + * kqueue (if false, this event is added/updated). + */ + private static native void kevent_set(ByteBuffer nstate, int i, int fd, + int interestOps, int activeOps, int key); + + /** + * Poll for events. The source events are stored in <code>events</code>, + * which is also where polled events will be placed. + * + * @param events The events to poll. This buffer is also the destination + * for events read from the queue. + * @param nevents The number of events to poll (that is, the number of + * events in the <code>events</code> buffer). + * @param nout The maximum number of events that may be returned. + * @param timeout The timeout. A timeout of -1 returns immediately; a timeout + * of 0 waits indefinitely. + * @return The number of events read. + */ + private static native int kevent(int kq, ByteBuffer events, int nevents, + int nout, long timeout); + + /** + * Fetch a polled key from a native state buffer. For each kevent key we + * create, we put the native state info (one or more <code>struct + * kevent</code>s) in that key's {@link KqueueSelectionKeyImpl#nstate} + * buffer, and place the pointer of the key in the <code>udata</code> field + * of that structure. This method fetches that pointer from the given + * buffer (assumed to be a <code>struct kqueue</code>) and returns it. + * + * @param nstate The buffer containing the <code>struct kqueue</code> to read. + * @return The key object. + */ + private static native int fetch_key(ByteBuffer nstate); + + /** + * Fetch the ready ops of the associated native state. That is, this + * inspects the first argument as a <code>struct kevent</code>, looking + * at its operation (the input is assumed to have been returned via a + * previous call to <code>kevent</code>), and translating that to the + * appropriate Java bit set, based on the second argument. + * + * @param nstate The native state. + * @param interestOps The enabled operations for the key. + * @return The bit set representing the ready operations. + */ + private static native int ready_ops(ByteBuffer nstate, int interestOps); + + /** + * Check if kevent returned EV_EOF for a selection key. + * + * @param nstate The native state. + * @return True if the kevent call returned EOF. + */ + private static native boolean check_eof(ByteBuffer nstate); +} |