Mercurial > hg > Members > kono > jpf-core
view src/tests/gov/nasa/jpf/test/mc/threads/MinimizePreemptionTest.java @ 0:61d41facf527
initial v8 import (history reset)
author | Peter Mehlitz <Peter.C.Mehlitz@nasa.gov> |
---|---|
date | Fri, 23 Jan 2015 10:14:01 -0800 |
parents | |
children |
line wrap: on
line source
/* * Copyright (C) 2014, United States Government, as represented by the * Administrator of the National Aeronautics and Space Administration. * All rights reserved. * * The Java Pathfinder core (jpf-core) platform is licensed under the * Apache License, Version 2.0 (the "License"); you may not use this file except * in compliance with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0. * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package gov.nasa.jpf.test.mc.threads; import gov.nasa.jpf.ListenerAdapter; import gov.nasa.jpf.search.Search; import gov.nasa.jpf.util.test.TestJPF; import gov.nasa.jpf.vm.VM; import gov.nasa.jpf.vm.ThreadChoiceGenerator; import gov.nasa.jpf.vm.ThreadInfo; import gov.nasa.jpf.vm.Verify; import org.junit.Test; /** * regression test for MinimizePreemption heuristic search */ public class MinimizePreemptionTest extends TestJPF { static final String SEARCH_OPT = "+search.class=.search.heuristic.MinimizePreemption"; public static class A implements Runnable { static int d = 0; // shared field private final int trip; public A (int dTrip){ trip = dTrip; } @Override public void run(){ int s = 0; for (int i=1; i<=5; i++){ // use loop var to make sure there always is a state change s = d*10 + i; // a shared GETSTATIC scheduling point } System.out.println(s); Verify.incrementCounter(0); // number of completions assert s/10 != trip : "gotcha"; } } //---------------------------------------------------------------------------- @Test public void testNoPreemptions(){ if (!isJPFRun()){ Verify.resetCounter(0); } if (verifyAssertionError( SEARCH_OPT)){ A a = new A(0); Thread t = new Thread(a); t.start(); for (int i=0; i<10; i++){ // use loop var to make sure there always is a state change A.d = i; // that's a PUTSTATIC scheduling point per cycle } } if (!isJPFRun()){ int nRunCompletions = Verify.getCounter(0); System.out.printf("number of A(0) run() completions = %d\n", nRunCompletions); assertTrue ("preemptions should be <= 2: (t* m+) or (m* t+)", (nRunCompletions <=2)); } } //---------------------------------------------------------------------------- // <2do> not a test yet static int maxPreemptions; // just outside JPF public static class Listener extends ListenerAdapter { int getPreemptions (Search search){ VM vm = search.getVM(); int n=0; ThreadChoiceGenerator cg = vm.getLastChoiceGeneratorOfType(ThreadChoiceGenerator.class); while (cg != null){ ThreadChoiceGenerator cgPrev = cg.getPreviousChoiceGeneratorOfType(ThreadChoiceGenerator.class); if (cg.isSchedulingPoint()) { System.out.println(" " + cg); if (cgPrev != null) { ThreadInfo ti = cg.getNextChoice(); ThreadInfo tiPrev = cgPrev.getNextChoice(); if (tiPrev != ti && cg.contains(tiPrev)) { n++; } } } cg = cgPrev; } return n; } // for the next queued state - preemption count should never decrease @Override public void stateRestored(Search search){ int nPreemptions = getPreemptions(search); System.out.println(" explore state with " + nPreemptions + " preemptions"); if (nPreemptions > maxPreemptions){ maxPreemptions = nPreemptions; } else if (nPreemptions < maxPreemptions){ fail("number of preemptions has to be increasing!"); } } } @Test public void testPreemptionCount(){ String listener = null; if (!isJPFRun()){ Verify.resetCounter(0); listener = "+listener=" + Listener.class.getName(); } if (verifyAssertionError( SEARCH_OPT, listener)){ A a = new A(1); // means we need one main cycle Thread t = new Thread(a); t.start(); for (int i=1; i<5; i++){ A.d = i; } } if (!isJPFRun()){ int nRunCompletions = Verify.getCounter(0); System.out.printf("completions = %d\n", nRunCompletions); } } }