203 lines
7.1 KiB
Java
203 lines
7.1 KiB
Java
/*
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* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 6302839
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* @summary SecurityRace System field accesses in two threads
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* @author Pete Soper
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* @build SecurityRace
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* @run main/othervm/policy=System.policy SecurityRace
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*/
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/*
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* By default the test runs for a very short time. Use main arg "stress"
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* to have a real chance of exposing races. Use main arg "time" to report
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* the average nanoseconds per invocation of System.setSecurityManager and
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* System.getSecurityManager. No testing for access races is performed with
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* argument "time."
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*
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* Requires security permissions "setSecurityManager" and
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* "createSecurityManager."
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*/
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public class SecurityRace implements Runnable {
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// Number of iterations to "warm up" and get methods compiled/inlined.
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// (this is conservative)
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static final int WARMUP_LOOPS = 100000;
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// Number of timing trials
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static final int TIMING_TRIALS = 10;
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// Seconds to run this in "stress" mode. This is double the average
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// time to expose the races of bug 6302839 on a Blade 1000. Invoke
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// the program with the "stress" option multiple times for more
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// confidence.
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static final int STRESS_MILLISECONDS = 300000;
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static final int SET_TIMING_LOOPS = 10000;
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// Max seconds to run before terminating the test ("declaring victory").
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static int MAX_MILLISECONDS = 100;
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// Number of iterations to time
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static final int GET_TIMING_LOOPS = 10000000;
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// Set true by main thread when NPE caught or time to terminate.
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// Set true by other thread when NPE caught. It makes
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// no difference where the NPE is thrown.
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static volatile boolean stopthreads = false;
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// Number of getProperty invocations between main loop checks
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static final int GETPROPERTY_LOOPS = 30000;
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// Used by race and timing tests. Must get set non-null at lease once.
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static SecurityManager sm = new SecurityManager();
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public static void main(String[] argv) throws Exception {
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String s;
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if (argv.length > 0) {
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if (argv[0].equals("time")) {
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// Run the timing method
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// First warm up the method to make sure it gets compiled
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for (int i = 0; i < WARMUP_LOOPS; i++) {
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timeit(1, 1, 1);
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}
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System.out.println("boo");
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// Now do the actual timing
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timeit(TIMING_TRIALS, GET_TIMING_LOOPS, SET_TIMING_LOOPS);
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} else if (argv[0].equals("stress")) {
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// For stress test the test duration is boosted
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MAX_MILLISECONDS = STRESS_MILLISECONDS;
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} else {
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throw new RuntimeException(
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"SecurityRace: " + argv[0]
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+ " argument to main not recognized");
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} // if argv
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} // if length
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long start = System.currentTimeMillis(),
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end = start + MAX_MILLISECONDS;
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// Create and start racing thread
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(new Thread(new SecurityRace())).start();
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// main thread alternates batches of getProperty() with time checks
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try {
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do {
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if (stopthreads) {
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// other thread suffered an NPE
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throw new RuntimeException("SecurityRace failed with NPE");
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}
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for (int i = 0; i < GETPROPERTY_LOOPS; i++) {
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s = System.getProperty("java.version");
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}
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} while (System.currentTimeMillis() < end);
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} catch (NullPointerException e) {
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throw new RuntimeException("SecurityRace failed with NPE");
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} finally {
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// make sure other thread terminates
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stopthreads = true;
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}
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} // main
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// System.security mutator.
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public void run() {
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try {
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while (true) {
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if (stopthreads) {
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return;
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}
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System.setSecurityManager(sm);
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// The goal is to catch another thread testing the
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// value set above and trying to use it after it's
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// nulled below.
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System.setSecurityManager(null);
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}
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} catch (NullPointerException e) {
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stopthreads = true;
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return;
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}
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}
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// Time method execution. Collects trials number of timings
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// for the number of accessor and mutator invocation loops
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// specified.
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public static void timeit(int timing_trials, int get_timing_loops,
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int set_timing_loops) {
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try {
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long start;
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// Time the methods and report average.
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// Time multiple trials so noise is apparent and a
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// T test can be used to establish significance.
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for (int j = 0; j < timing_trials; j++) {
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start = System.nanoTime();
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for (int i = 0; i < get_timing_loops; i++) {
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sm = System.getSecurityManager();
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}
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// Don't print for "warmup" case. This might mean that
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// the compiler fails to compile the println (setting it
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// up to execute via interpretation using an "uncommon trap")
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// but we don't care if this println runs slowly!
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if (timing_trials > 1) {
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System.out.println((float) (System.nanoTime() - start)
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/ (float) get_timing_loops);
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}
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}
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for (int j = 0; j < timing_trials; j++) {
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start = System.nanoTime();
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for (int i = 0; i < set_timing_loops; i++) {
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System.setSecurityManager(sm);
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}
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if (timing_trials > 1) {
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System.out.println((float) (System.nanoTime() - start)
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/ (float) set_timing_loops);
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}
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}
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return;
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} catch (Exception e) {
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throw new RuntimeException("SecurityRace got unexpected: " + e);
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}
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} // timeit
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} // SecurityRace
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