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/*
* Copyright (c) 2001, 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.*;
import sun.misc.*;
/**
* An implementation of Selector for Solaris.
*/
class PollSelectorImpl
extends AbstractPollSelectorImpl
{
// File descriptors used for interrupt
private int fd0;
private int fd1;
// Lock for interrupt triggering and clearing
private Object interruptLock = new Object();
private boolean interruptTriggered = false;
/**
* Package private constructor called by factory method in
* the abstract superclass Selector.
*/
PollSelectorImpl(SelectorProvider sp) {
super(sp, 1, 1);
long pipeFds = IOUtil.makePipe(false);
fd0 = (int) (pipeFds >>> 32);
fd1 = (int) pipeFds;
try {
pollWrapper = new PollArrayWrapper(INIT_CAP);
pollWrapper.initInterrupt(fd0, fd1);
channelArray = new SelectionKeyImpl[INIT_CAP];
} 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 (channelArray == null)
throw new ClosedSelectorException();
processDeregisterQueue();
try {
begin();
pollWrapper.poll(totalChannels, 0, timeout);
} finally {
end();
}
processDeregisterQueue();
int numKeysUpdated = updateSelectedKeys();
if (pollWrapper.getReventOps(0) != 0) {
// Clear the wakeup pipe
pollWrapper.putReventOps(0, 0);
synchronized (interruptLock) {
IOUtil.drain(fd0);
interruptTriggered = false;
}
}
return numKeysUpdated;
}
protected void implCloseInterrupt() throws IOException {
// prevent further wakeup
synchronized (interruptLock) {
interruptTriggered = true;
}
FileDispatcherImpl.closeIntFD(fd0);
FileDispatcherImpl.closeIntFD(fd1);
fd0 = -1;
fd1 = -1;
pollWrapper.release(0);
}
public Selector wakeup() {
synchronized (interruptLock) {
if (!interruptTriggered) {
pollWrapper.interrupt();
interruptTriggered = true;
}
}
return this;
}
}
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