russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
73 lines
2.1 KiB
Java
73 lines
2.1 KiB
Java
/*
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* Copyright (c) 2021, 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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/*
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* Provides access to the Linux eventfd object.
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*/
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final class EventFD {
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private final int efd;
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/**
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* Creates a blocking eventfd object with initial value zero.
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*/
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EventFD() throws IOException {
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efd = eventfd0();
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}
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int efd() {
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return efd;
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}
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void set() throws IOException {
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set0(efd);
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}
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void reset() throws IOException {
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IOUtil.drain(efd);
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}
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void close() throws IOException {
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FileDispatcherImpl.closeIntFD(efd);
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}
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private static native int eventfd0() throws IOException;
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/**
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* Writes the value 1 to the eventfd object as a long in the
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* native byte order of the platform.
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*
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* @param the integral eventfd file descriptor
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* @return the number of bytes written; should equal 8
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*/
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private static native int set0(int efd) throws IOException;
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static {
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IOUtil.load();
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}
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}
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