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