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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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/**
 * 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.
/**
     * 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.
/**
     * 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.
/**
     * 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);

    static {
        IOUtil.load();
    }
}