/*
* Copyright (c) 2001, 2004, 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
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*/
package sun.nio.ch;
import sun.misc.*;
/**
* 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 PollArrayWrapper extends AbstractPollArrayWrapper {
static final short POLLCONN = POLLOUT;
// File descriptor to write for interrupt
int interruptFD;
PollArrayWrapper(int newSize) {
newSize = (newSize + 1) * SIZE_POLLFD;
pollArray = new AllocatedNativeObject(newSize, false);
pollArrayAddress = pollArray.address();
totalChannels = 1;
}
void initInterrupt(int fd0, int fd1) {
interruptFD = fd1;
putDescriptor(0, fd0);
putEventOps(0, POLLIN);
putReventOps(0, 0);
}
void release(int i) {
return;
}
void free() {
pollArray.free();
}
/**
* Prepare another pollfd struct for use.
*/
void addEntry(SelChImpl sc) {
putDescriptor(totalChannels, IOUtil.fdVal(sc.getFD()));
putEventOps(totalChannels, 0);
putReventOps(totalChannels, 0);
totalChannels++;
}
/**
* Writes the pollfd entry from the source wrapper at the source index
* over the entry in the target wrapper at the target index. The source
* array remains unchanged unless the source array and the target are
* the same array.
*/
static void replaceEntry(PollArrayWrapper source, int sindex,
PollArrayWrapper target, int tindex) {
target.putDescriptor(tindex, source.getDescriptor(sindex));
target.putEventOps(tindex, source.getEventOps(sindex));
target.putReventOps(tindex, source.getReventOps(sindex));
}
/**
* Grows the pollfd array to a size that will accommodate newSize
* pollfd entries. This method does no checking of the newSize
* to determine if it is in fact bigger than the old size: it
* always reallocates an array of the new size.
*/
void grow(int newSize) {
// create new array
PollArrayWrapper temp = new PollArrayWrapper(newSize);
// Copy over existing entries
for (int i=0; i<totalChannels; i++)
replaceEntry(this, i, temp, i);
// Swap new array into pollArray field
pollArray.free();
pollArray = temp.pollArray;
pollArrayAddress = pollArray.address();
}
int poll(int numfds, int offset, long timeout) {
return poll0(pollArrayAddress + (offset * SIZE_POLLFD),
numfds, timeout);
}
public void interrupt() {
interrupt(interruptFD);
}
private native int poll0(long pollAddress, int numfds, long timeout);
private static native void interrupt(int fd);
}