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72 lines
2.5 KiB
Java
72 lines
2.5 KiB
Java
/*
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* Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.nio.ch;
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import java.io.IOException;
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import static sun.nio.ch.WEPoll.*;
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/**
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* Poller implementation based on wepoll.
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*/
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class WEPollPoller extends Poller {
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private static final int MAX_EVENTS_TO_POLL = 256;
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private static final int ENOENT = 2;
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private final long handle;
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private final int event;
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private final long address;
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WEPollPoller(boolean read) throws IOException {
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this.handle = WEPoll.create();
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this.event = (read) ? EPOLLIN : EPOLLOUT;
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this.address = WEPoll.allocatePollArray(MAX_EVENTS_TO_POLL);
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}
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@Override
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void implRegister(int fdVal) throws IOException {
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int err = WEPoll.ctl(handle, EPOLL_CTL_ADD, fdVal, (event | EPOLLONESHOT));
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if (err != 0)
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throw new IOException("epoll_ctl failed: " + err);
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}
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@Override
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void implDeregister(int fdVal, boolean polled) {
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WEPoll.ctl(handle, EPOLL_CTL_DEL, fdVal, 0);
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}
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@Override
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int poll(int timeout) throws IOException {
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int n = WEPoll.wait(handle, address, MAX_EVENTS_TO_POLL, timeout);
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int i = 0;
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while (i < n) {
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long event = WEPoll.getEvent(address, i);
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int fdVal = WEPoll.getDescriptor(event);
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polled(fdVal);
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i++;
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}
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return n;
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}
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}
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