mirror of
https://github.com/openjdk/jdk.git
synced 2026-03-15 02:13:19 +00:00
125 lines
4.1 KiB
Java
125 lines
4.1 KiB
Java
/*
|
|
* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
|
|
* Copyright (c) 2023, IBM Corp.
|
|
* 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 jdk.internal.misc.Unsafe;
|
|
|
|
public class Pollset {
|
|
|
|
private static final Unsafe unsafe = Unsafe.getUnsafe();
|
|
|
|
/**
|
|
* struct pollfd {
|
|
* int fd;
|
|
* short events;
|
|
* short revents;
|
|
* }
|
|
*/
|
|
public static final int SIZEOF_POLLFD = eventSize();
|
|
public static final int OFFSETOF_EVENTS = eventsOffset();
|
|
public static final int OFFSETOF_REVENTS = reventsOffset();
|
|
public static final int OFFSETOF_FD = fdOffset();
|
|
|
|
// opcodes
|
|
public static final int PS_ADD = 0x0;
|
|
public static final int PS_MOD = 0x1;
|
|
public static final int PS_DELETE = 0x2;
|
|
|
|
// event
|
|
public static final int PS_POLLPRI = 0x4;
|
|
|
|
// revent errcodes
|
|
public static final char PS_POLLNVAL = 0x8000;
|
|
public static final char PS_POLLERR = 0x4000;
|
|
|
|
public static final int PS_NO_TIMEOUT = -1;
|
|
|
|
/**
|
|
* Allocates a poll array to handle up to {@code count} events.
|
|
*/
|
|
public static long allocatePollArray(int count) {
|
|
return unsafe.allocateMemory(count * SIZEOF_POLLFD);
|
|
}
|
|
|
|
/**
|
|
* Free a poll array
|
|
*/
|
|
public static void freePollArray(long address) {
|
|
unsafe.freeMemory(address);
|
|
}
|
|
|
|
/**
|
|
* Returns event[i];
|
|
*/
|
|
public static long getEvent(long address, int i) {
|
|
return address + (SIZEOF_POLLFD * i);
|
|
}
|
|
|
|
/**
|
|
* Returns event->fd
|
|
*/
|
|
public static int getDescriptor(long eventAddress) {
|
|
return unsafe.getInt(eventAddress + OFFSETOF_FD);
|
|
}
|
|
|
|
/**
|
|
* Returns event->events
|
|
*/
|
|
public static int getEvents(long eventAddress) {
|
|
return unsafe.getChar(eventAddress + OFFSETOF_EVENTS);
|
|
}
|
|
|
|
/**
|
|
* Returns event->revents
|
|
*/
|
|
public static char getRevents(long eventAddress) {
|
|
return unsafe.getChar(eventAddress + OFFSETOF_REVENTS);
|
|
}
|
|
|
|
public static boolean isReventsError(long eventAddress) {
|
|
char revents = getRevents(eventAddress);
|
|
return (revents & PS_POLLNVAL) != 0 || (revents & PS_POLLERR) != 0;
|
|
}
|
|
|
|
// -- Native methods --
|
|
public static native int pollsetCreate() throws IOException;
|
|
public static native int pollsetCtl(int pollset, int opcode, int fd, int events);
|
|
public static native int pollsetPoll(int pollset, long pollAddress, int numfds, int timeout)
|
|
throws IOException;
|
|
public static native void pollsetDestroy(int pollset);
|
|
public static native void init();
|
|
public static native int eventSize();
|
|
public static native int eventsOffset();
|
|
public static native int reventsOffset();
|
|
public static native int fdOffset();
|
|
public static native void socketpair(int[] sv) throws IOException;
|
|
public static native void interrupt(int fd) throws IOException;
|
|
public static native void drain1(int fd) throws IOException;
|
|
public static native void close0(int fd);
|
|
}
|