Mercurial > hg > Members > kono > jpf-core

annotate src/classes/java/util/concurrent/Exchanger.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18
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19 package java.util.concurrent;
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20
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21 /**
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22 * model class for java.util.concurrent.Exchanger
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23 * We model because the original class goes to great lengths implementing
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24 * memory based synchronization, using execution time and spins
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25 *
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26 * Exchangers are also per se shared objects, so we want to minimize field
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27 * access from bytecode
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28 */
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29 public class Exchanger<V> {
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30
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31 // created on native side and pinned down until transaction is complete
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32 static class Exchange<T> {
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33 Thread waiterThread;
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34 boolean waiterTimedOut;
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35
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36 T waiterData;
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37 T responderData;
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38 }
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39
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40 //-- only accessed from native methods
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41 private Exchange<V> exchange;
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42
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43
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44 public native V exchange(V value) throws InterruptedException;
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45
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46 private native V exchange0 (V value, long timeoutMillis) throws InterruptedException, TimeoutException;
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47
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48 // unfortunately we can't directly go native here without duplicating the TimeUnit conversion in the peer
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49 public V exchange(V value, long timeout, TimeUnit unit) throws InterruptedException, TimeoutException {
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50 long to = unit.convert(timeout,TimeUnit.MILLISECONDS);
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51 return exchange0( value, to);
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52 }
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53 }