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products/Sources/formale Sprachen/Java/Openjdk/src/java.base/linux/classes/sun/nio/ch/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 2 kB

Quelle EventFD.java Sprache: JAVA

/*
* Copyright (c) 2021, 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

package sun.nio.ch;

import java.io.IOException;

/*
* Provides access to the Linux eventfd object.
*/
final class EventFD {
    private final int efd;

    /**
     * Creates a blocking eventfd object with initial value zero.
     */
    EventFD() throws IOException {
        efd = eventfd0();
    }

    int efd() {
        return efd;
    }

    void set() throws IOException {
        set0(efd);
    }

    void reset() throws IOException {
        IOUtil.drain(efd);
    }

    void close() throws IOException {
        FileDispatcherImpl.closeIntFD(efd);
    }

    private static native int eventfd0() throws IOException;

    /**
     * Writes the value 1 to the eventfd object as a long in the
     * native byte order of the platform.
     *
     * @param the integral eventfd file descriptor
     * @return the number of bytes written; should equal 8
     */
    private static native int set0(int efd) throws IOException;

    static {
        IOUtil.load();
    }
}

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