84 lines
2.4 KiB
Haxe
84 lines
2.4 KiB
Haxe
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/*
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* Copyright (C)2005-2019 Haxe Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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package java.vm;
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import java.util.concurrent.atomic.AtomicReference;
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/**
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A lock-free queue implementation
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**/
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@:native('haxe.java.vm.AtomicList')
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@:nativeGen class AtomicList<T> {
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@:volatile @:private var head:AtomicNode<T>;
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@:volatile @:private var tail:AtomicReference<AtomicNode<T>>;
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public function new() {
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this.head = new AtomicNode(null);
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this.head.set(new AtomicNode(null));
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this.tail = new AtomicReference(head);
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}
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public function add(v:T) {
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var n = new AtomicNode(v), tail = this.tail;
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var p = null;
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while (!((p = tail.get()).compareAndSet(null, n))) {
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tail.compareAndSet(p, p.get());
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}
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tail.compareAndSet(p, n);
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}
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public function pop():Null<T> {
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var p = null, pget = null, head = head;
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do {
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p = head.get();
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if ((pget = p.get()) == null)
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return null; // empty
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} while (!head.compareAndSet(p, pget));
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var ret = pget.value;
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pget.value = null;
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return ret;
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}
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public function peek() {
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var ret = head.get();
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if (ret == null)
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return null; // empty
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return ret.value;
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}
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public function peekLast() {
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return tail.get().value;
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}
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}
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@:native('haxe.java.vm.AtomicNode')
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@:nativeGen class AtomicNode<T> extends AtomicReference<AtomicNode<T>> {
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public var value:T;
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public function new(value) {
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super();
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this.value = value;
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}
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}
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