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+/*
+ * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 6302839
+ * @summary SecurityRace System field accesses in two threads
+ * @author Pete Soper
+ * @build SecurityRace
+ * @run main/othervm/policy=System.policy SecurityRace
+ */
+
+/*
+ * By default the test runs for a very short time. Use main arg "stress"
+ * to have a real chance of exposing races. Use main arg "time" to report
+ * the average nanoseconds per invocation of System.setSecurityManager and
+ * System.getSecurityManager. No testing for access races is performed with
+ * argument "time."
+ *
+ * Requires security permissions "setSecurityManager" and
+ * "createSecurityManager."
+ */
+
+
+
+public class SecurityRace implements Runnable {
+
+ // Number of iterations to "warm up" and get methods compiled/inlined.
+ // (this is conservative)
+ static final int WARMUP_LOOPS = 100000;
+
+ // Number of timing trials
+ static final int TIMING_TRIALS = 10;
+
+ // Seconds to run this in "stress" mode. This is double the average
+ // time to expose the races of bug 6302839 on a Blade 1000. Invoke
+ // the program with the "stress" option multiple times for more
+ // confidence.
+ static final int STRESS_MILLISECONDS = 300000;
+ static final int SET_TIMING_LOOPS = 10000;
+
+ // Max seconds to run before terminating the test ("declaring victory").
+ static int MAX_MILLISECONDS = 100;
+
+ // Number of iterations to time
+ static final int GET_TIMING_LOOPS = 10000000;
+
+ // Set true by main thread when NPE caught or time to terminate.
+ // Set true by other thread when NPE caught. It makes
+ // no difference where the NPE is thrown.
+ static volatile boolean stopthreads = false;
+
+ // Number of getProperty invocations between main loop checks
+ static final int GETPROPERTY_LOOPS = 30000;
+
+ // Used by race and timing tests. Must get set non-null at lease once.
+ static SecurityManager sm = new SecurityManager();
+
+ public static void main(String[] argv) throws Exception {
+ String s;
+
+ if (argv.length > 0) {
+ if (argv[0].equals("time")) {
+
+ // Run the timing method
+ // First warm up the method to make sure it gets compiled
+ for (int i = 0; i < WARMUP_LOOPS; i++) {
+ timeit(1, 1, 1);
+ }
+
+ System.out.println("boo");
+
+ // Now do the actual timing
+ timeit(TIMING_TRIALS, GET_TIMING_LOOPS, SET_TIMING_LOOPS);
+ } else if (argv[0].equals("stress")) {
+
+ // For stress test the test duration is boosted
+ MAX_MILLISECONDS = STRESS_MILLISECONDS;
+ } else {
+ throw new RuntimeException(
+ "SecurityRace: " + argv[0]
+ + " argument to main not recognized");
+ } // if argv
+ } // if length
+
+ long start = System.currentTimeMillis(),
+ end = start + MAX_MILLISECONDS;
+
+ // Create and start racing thread
+ (new Thread(new SecurityRace())).start();
+
+ // main thread alternates batches of getProperty() with time checks
+ try {
+ do {
+ if (stopthreads) {
+
+ // other thread suffered an NPE
+ throw new RuntimeException("SecurityRace failed with NPE");
+ }
+
+ for (int i = 0; i < GETPROPERTY_LOOPS; i++) {
+ s = System.getProperty("java.version");
+ }
+ } while (System.currentTimeMillis() < end);
+ } catch (NullPointerException e) {
+ throw new RuntimeException("SecurityRace failed with NPE");
+ } finally {
+
+ // make sure other thread terminates
+ stopthreads = true;
+ }
+ } // main
+
+ // System.security mutator.
+ public void run() {
+ try {
+ while (true) {
+ if (stopthreads) {
+ return;
+ }
+
+ System.setSecurityManager(sm);
+
+ // The goal is to catch another thread testing the
+ // value set above and trying to use it after it's
+ // nulled below.
+ System.setSecurityManager(null);
+ }
+ } catch (NullPointerException e) {
+ stopthreads = true;
+
+ return;
+ }
+ }
+
+ // Time method execution. Collects trials number of timings
+ // for the number of accessor and mutator invocation loops
+ // specified.
+ public static void timeit(int timing_trials, int get_timing_loops,
+ int set_timing_loops) {
+ try {
+ long start;
+
+ // Time the methods and report average.
+ // Time multiple trials so noise is apparent and a
+ // T test can be used to establish significance.
+ for (int j = 0; j < timing_trials; j++) {
+ start = System.nanoTime();
+
+ for (int i = 0; i < get_timing_loops; i++) {
+ sm = System.getSecurityManager();
+ }
+
+ // Don't print for "warmup" case. This might mean that
+ // the compiler fails to compile the println (setting it
+ // up to execute via interpretation using an "uncommon trap")
+ // but we don't care if this println runs slowly!
+ if (timing_trials > 1) {
+ System.out.println((float) (System.nanoTime() - start)
+ / (float) get_timing_loops);
+ }
+ }
+
+ for (int j = 0; j < timing_trials; j++) {
+ start = System.nanoTime();
+
+ for (int i = 0; i < set_timing_loops; i++) {
+ System.setSecurityManager(sm);
+ }
+
+ if (timing_trials > 1) {
+ System.out.println((float) (System.nanoTime() - start)
+ / (float) set_timing_loops);
+ }
+ }
+
+ return;
+ } catch (Exception e) {
+ throw new RuntimeException("SecurityRace got unexpected: " + e);
+ }
+ } // timeit
+} // SecurityRace