8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/linux/classes/sun/nio/ch/EPollSelectorImpl.java

@@ -0,0 +1,212 @@
+/*
+ * Copyright (c) 2005, 2015, 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.nio.channels.*;
+import java.nio.channels.spi.*;
+import java.util.*;
+
+/**
+ * An implementation of Selector for Linux 2.6+ kernels that uses
+ * the epoll event notification facility.
+ */
+class EPollSelectorImpl
+    extends SelectorImpl
+{
+
+    // File descriptors used for interrupt
+    protected int fd0;
+    protected int fd1;
+
+    // The poll object
+    EPollArrayWrapper pollWrapper;
+
+    // Maps from file descriptors to keys
+    private Map<Integer,SelectionKeyImpl> fdToKey;
+
+    // True if this Selector has been closed
+    private volatile boolean closed;
+
+    // Lock for interrupt triggering and clearing
+    private final Object interruptLock = new Object();
+    private boolean interruptTriggered = false;
+
+    /**
+     * Package private constructor called by factory method in
+     * the abstract superclass Selector.
+     */
+    EPollSelectorImpl(SelectorProvider sp) throws IOException {
+        super(sp);
+        long pipeFds = IOUtil.makePipe(false);
+        fd0 = (int) (pipeFds >>> 32);
+        fd1 = (int) pipeFds;
+        try {
+            pollWrapper = new EPollArrayWrapper();
+            pollWrapper.initInterrupt(fd0, fd1);
+            fdToKey = new HashMap<>();
+        } catch (Throwable t) {
+            try {
+                FileDispatcherImpl.closeIntFD(fd0);
+            } catch (IOException ioe0) {
+                t.addSuppressed(ioe0);
+            }
+            try {
+                FileDispatcherImpl.closeIntFD(fd1);
+            } catch (IOException ioe1) {
+                t.addSuppressed(ioe1);
+            }
+            throw t;
+        }
+    }
+
+    protected int doSelect(long timeout) throws IOException {
+        if (closed)
+            throw new ClosedSelectorException();
+        processDeregisterQueue();
+        try {
+            begin();
+            pollWrapper.poll(timeout);
+        } finally {
+            end();
+        }
+        processDeregisterQueue();
+        int numKeysUpdated = updateSelectedKeys();
+        if (pollWrapper.interrupted()) {
+            // Clear the wakeup pipe
+            pollWrapper.putEventOps(pollWrapper.interruptedIndex(), 0);
+            synchronized (interruptLock) {
+                pollWrapper.clearInterrupted();
+                IOUtil.drain(fd0);
+                interruptTriggered = false;
+            }
+        }
+        return numKeysUpdated;
+    }
+
+    /**
+     * Update the keys whose fd's have been selected by the epoll.
+     * Add the ready keys to the ready queue.
+     */
+    private int updateSelectedKeys() {
+        int entries = pollWrapper.updated;
+        int numKeysUpdated = 0;
+        for (int i=0; i<entries; i++) {
+            int nextFD = pollWrapper.getDescriptor(i);
+            SelectionKeyImpl ski = fdToKey.get(Integer.valueOf(nextFD));
+            // ski is null in the case of an interrupt
+            if (ski != null) {
+                int rOps = pollWrapper.getEventOps(i);
+                if (selectedKeys.contains(ski)) {
+                    if (ski.channel.translateAndSetReadyOps(rOps, ski)) {
+                        numKeysUpdated++;
+                    }
+                } else {
+                    ski.channel.translateAndSetReadyOps(rOps, ski);
+                    if ((ski.nioReadyOps() & ski.nioInterestOps()) != 0) {
+                        selectedKeys.add(ski);
+                        numKeysUpdated++;
+                    }
+                }
+            }
+        }
+        return numKeysUpdated;
+    }
+
+    protected void implClose() throws IOException {
+        if (closed)
+            return;
+        closed = true;
+
+        // prevent further wakeup
+        synchronized (interruptLock) {
+            interruptTriggered = true;
+        }
+
+        FileDispatcherImpl.closeIntFD(fd0);
+        FileDispatcherImpl.closeIntFD(fd1);
+
+        pollWrapper.closeEPollFD();
+        // it is possible
+        selectedKeys = null;
+
+        // Deregister channels
+        Iterator<SelectionKey> i = keys.iterator();
+        while (i.hasNext()) {
+            SelectionKeyImpl ski = (SelectionKeyImpl)i.next();
+            deregister(ski);
+            SelectableChannel selch = ski.channel();
+            if (!selch.isOpen() && !selch.isRegistered())
+                ((SelChImpl)selch).kill();
+            i.remove();
+        }
+
+        fd0 = -1;
+        fd1 = -1;
+    }
+
+    protected void implRegister(SelectionKeyImpl ski) {
+        if (closed)
+            throw new ClosedSelectorException();
+        SelChImpl ch = ski.channel;
+        int fd = Integer.valueOf(ch.getFDVal());
+        fdToKey.put(fd, ski);
+        pollWrapper.add(fd);
+        keys.add(ski);
+    }
+
+    protected void implDereg(SelectionKeyImpl ski) throws IOException {
+        assert (ski.getIndex() >= 0);
+        SelChImpl ch = ski.channel;
+        int fd = ch.getFDVal();
+        fdToKey.remove(Integer.valueOf(fd));
+        pollWrapper.remove(fd);
+        ski.setIndex(-1);
+        keys.remove(ski);
+        selectedKeys.remove(ski);
+        deregister((AbstractSelectionKey)ski);
+        SelectableChannel selch = ski.channel();
+        if (!selch.isOpen() && !selch.isRegistered())
+            ((SelChImpl)selch).kill();
+    }
+
+    public void putEventOps(SelectionKeyImpl ski, int ops) {
+        if (closed)
+            throw new ClosedSelectorException();
+        SelChImpl ch = ski.channel;
+        pollWrapper.setInterest(ch.getFDVal(), ops);
+    }
+
+    public Selector wakeup() {
+        synchronized (interruptLock) {
+            if (!interruptTriggered) {
+                pollWrapper.interrupt();
+                interruptTriggered = true;
+            }
+        }
+        return this;
+    }
+}