java.util.concurrent.Exchanger$_init Maven / Gradle / Ivy

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/*
 * This code is based on OpenJDK source file(s) which contain the following copyright notice:
 *
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 * Copyright (c) 2001, 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.
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 * contributors.
 */

package java.util.concurrent;

import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;

import org.qbicc.rt.annotation.Tracking;
import org.qbicc.runtime.patcher.PatchClass;
import org.qbicc.runtime.patcher.ReplaceInit;

@PatchClass(Exchanger.class)
@Tracking("src/java.base/share/classes/java/util/concurrent/Exchanger.java")
@ReplaceInit
public class Exchanger$_init {
    private static final int ASHIFT = 5;
    /* private*/ static final int MMASK = 0xff;
    private static final int SEQ = MMASK + 1;
    private static final int SPINS = 1 << 10;
    private static final Object NULL_ITEM = new Object();
    private static final Object TIMED_OUT = new Object();

    private static final VarHandle BOUND;
    private static final VarHandle SLOT;
    private static final VarHandle MATCH;
    private static final VarHandle AA;
    static {
        try {
            MethodHandles.Lookup l = MethodHandles.lookup();
            BOUND = l.findVarHandle(Exchanger.class, "bound", int.class);
            SLOT = l.findVarHandle(Exchanger.class, "slot", Exchanger.Node.class);
            MATCH = l.findVarHandle(Exchanger.Node.class, "match", Object.class);
            AA = MethodHandles.arrayElementVarHandle(Exchanger.Node[].class);
        } catch (ReflectiveOperationException e) {
            throw new ExceptionInInitializerError(e);
        }
    }
}