J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 6302839 |
| 27 | * @summary SecurityRace System field accesses in two threads |
| 28 | * @author Pete Soper |
| 29 | * @build SecurityRace |
| 30 | * @run main/othervm/policy=System.policy SecurityRace |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * By default the test runs for a very short time. Use main arg "stress" |
| 35 | * to have a real chance of exposing races. Use main arg "time" to report |
| 36 | * the average nanoseconds per invocation of System.setSecurityManager and |
| 37 | * System.getSecurityManager. No testing for access races is performed with |
| 38 | * argument "time." |
| 39 | * |
| 40 | * Requires security permissions "setSecurityManager" and |
| 41 | * "createSecurityManager." |
| 42 | */ |
| 43 | |
| 44 | |
| 45 | |
| 46 | public class SecurityRace implements Runnable { |
| 47 | |
| 48 | // Number of iterations to "warm up" and get methods compiled/inlined. |
| 49 | // (this is conservative) |
| 50 | static final int WARMUP_LOOPS = 100000; |
| 51 | |
| 52 | // Number of timing trials |
| 53 | static final int TIMING_TRIALS = 10; |
| 54 | |
| 55 | // Seconds to run this in "stress" mode. This is double the average |
| 56 | // time to expose the races of bug 6302839 on a Blade 1000. Invoke |
| 57 | // the program with the "stress" option multiple times for more |
| 58 | // confidence. |
| 59 | static final int STRESS_MILLISECONDS = 300000; |
| 60 | static final int SET_TIMING_LOOPS = 10000; |
| 61 | |
| 62 | // Max seconds to run before terminating the test ("declaring victory"). |
| 63 | static int MAX_MILLISECONDS = 100; |
| 64 | |
| 65 | // Number of iterations to time |
| 66 | static final int GET_TIMING_LOOPS = 10000000; |
| 67 | |
| 68 | // Set true by main thread when NPE caught or time to terminate. |
| 69 | // Set true by other thread when NPE caught. It makes |
| 70 | // no difference where the NPE is thrown. |
| 71 | static volatile boolean stopthreads = false; |
| 72 | |
| 73 | // Number of getProperty invocations between main loop checks |
| 74 | static final int GETPROPERTY_LOOPS = 30000; |
| 75 | |
| 76 | // Used by race and timing tests. Must get set non-null at lease once. |
| 77 | static SecurityManager sm = new SecurityManager(); |
| 78 | |
| 79 | public static void main(String[] argv) throws Exception { |
| 80 | String s; |
| 81 | |
| 82 | if (argv.length > 0) { |
| 83 | if (argv[0].equals("time")) { |
| 84 | |
| 85 | // Run the timing method |
| 86 | // First warm up the method to make sure it gets compiled |
| 87 | for (int i = 0; i < WARMUP_LOOPS; i++) { |
| 88 | timeit(1, 1, 1); |
| 89 | } |
| 90 | |
| 91 | System.out.println("boo"); |
| 92 | |
| 93 | // Now do the actual timing |
| 94 | timeit(TIMING_TRIALS, GET_TIMING_LOOPS, SET_TIMING_LOOPS); |
| 95 | } else if (argv[0].equals("stress")) { |
| 96 | |
| 97 | // For stress test the test duration is boosted |
| 98 | MAX_MILLISECONDS = STRESS_MILLISECONDS; |
| 99 | } else { |
| 100 | throw new RuntimeException( |
| 101 | "SecurityRace: " + argv[0] |
| 102 | + " argument to main not recognized"); |
| 103 | } // if argv |
| 104 | } // if length |
| 105 | |
| 106 | long start = System.currentTimeMillis(), |
| 107 | end = start + MAX_MILLISECONDS; |
| 108 | |
| 109 | // Create and start racing thread |
| 110 | (new Thread(new SecurityRace())).start(); |
| 111 | |
| 112 | // main thread alternates batches of getProperty() with time checks |
| 113 | try { |
| 114 | do { |
| 115 | if (stopthreads) { |
| 116 | |
| 117 | // other thread suffered an NPE |
| 118 | throw new RuntimeException("SecurityRace failed with NPE"); |
| 119 | } |
| 120 | |
| 121 | for (int i = 0; i < GETPROPERTY_LOOPS; i++) { |
| 122 | s = System.getProperty("java.version"); |
| 123 | } |
| 124 | } while (System.currentTimeMillis() < end); |
| 125 | } catch (NullPointerException e) { |
| 126 | throw new RuntimeException("SecurityRace failed with NPE"); |
| 127 | } finally { |
| 128 | |
| 129 | // make sure other thread terminates |
| 130 | stopthreads = true; |
| 131 | } |
| 132 | } // main |
| 133 | |
| 134 | // System.security mutator. |
| 135 | public void run() { |
| 136 | try { |
| 137 | while (true) { |
| 138 | if (stopthreads) { |
| 139 | return; |
| 140 | } |
| 141 | |
| 142 | System.setSecurityManager(sm); |
| 143 | |
| 144 | // The goal is to catch another thread testing the |
| 145 | // value set above and trying to use it after it's |
| 146 | // nulled below. |
| 147 | System.setSecurityManager(null); |
| 148 | } |
| 149 | } catch (NullPointerException e) { |
| 150 | stopthreads = true; |
| 151 | |
| 152 | return; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | // Time method execution. Collects trials number of timings |
| 157 | // for the number of accessor and mutator invocation loops |
| 158 | // specified. |
| 159 | public static void timeit(int timing_trials, int get_timing_loops, |
| 160 | int set_timing_loops) { |
| 161 | try { |
| 162 | long start; |
| 163 | |
| 164 | // Time the methods and report average. |
| 165 | // Time multiple trials so noise is apparent and a |
| 166 | // T test can be used to establish significance. |
| 167 | for (int j = 0; j < timing_trials; j++) { |
| 168 | start = System.nanoTime(); |
| 169 | |
| 170 | for (int i = 0; i < get_timing_loops; i++) { |
| 171 | sm = System.getSecurityManager(); |
| 172 | } |
| 173 | |
| 174 | // Don't print for "warmup" case. This might mean that |
| 175 | // the compiler fails to compile the println (setting it |
| 176 | // up to execute via interpretation using an "uncommon trap") |
| 177 | // but we don't care if this println runs slowly! |
| 178 | if (timing_trials > 1) { |
| 179 | System.out.println((float) (System.nanoTime() - start) |
| 180 | / (float) get_timing_loops); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | for (int j = 0; j < timing_trials; j++) { |
| 185 | start = System.nanoTime(); |
| 186 | |
| 187 | for (int i = 0; i < set_timing_loops; i++) { |
| 188 | System.setSecurityManager(sm); |
| 189 | } |
| 190 | |
| 191 | if (timing_trials > 1) { |
| 192 | System.out.println((float) (System.nanoTime() - start) |
| 193 | / (float) set_timing_loops); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | return; |
| 198 | } catch (Exception e) { |
| 199 | throw new RuntimeException("SecurityRace got unexpected: " + e); |
| 200 | } |
| 201 | } // timeit |
| 202 | } // SecurityRace |