Mercurial > hg > Members > kono > jpf-core

comparison src/main/gov/nasa/jpf/vm/TimeModel.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 /*
2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
4 * All rights reserved.
5 *
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
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0.
11 *
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.
17 */
18 package gov.nasa.jpf.vm;
19
20 /**
21 * interface that encapsulates the mechanism to obtain values for
22 *
23 * System.getCurrentTimeMillis()
24 * System.nanoTime()
25 *
26 * calls. Implementors should guarantee the invariant that time values are
27 * strictly increasing along any given path, but don't have to backtrack
28 * time values in order to achieve uniform time increments along all paths.
29 *
30 * Note that implementations have to avoid creating state leaks, i.e.
31 * the respective time value storage should not contribute to the state space
32 * hashing. If it has to be backtrackable, it either has to be stored on the
33 * native side, or marked as @FilterField
34 */
35 public interface TimeModel {
36
37 public long currentTimeMillis();
38 public long nanoTime();
39 }