LoopHelpers.java revision 3984
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * This code is free software; you can redistribute it and/or modify it
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * under the terms of the GNU General Public License version 2 only, as
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * published by the Free Software Foundation.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * This code is distributed in the hope that it will be useful, but WITHOUT
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * version 2 for more details (a copy is included in the LICENSE file that
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * accompanied this code).
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * You should have received a copy of the GNU General Public License version
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * 2 along with this work; if not, write to the Free Software Foundation,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * or visit www.oracle.com if you need additional information or have any
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * questions.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * This file is available under and governed by the GNU General Public
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * License version 2 only, as published by the Free Software Foundation.
bbf6f00c25b6a2bed23c35eac6d62998ecdb338cJordan Brown * However, the following notice accompanied the original version of this
a90cf9f29973990687fa61de9f1f6ea22e924e40Gordon Ross * Written by Doug Lea with assistance from members of JCP JSR-166
a90cf9f29973990687fa61de9f1f6ea22e924e40Gordon Ross * Expert Group and released to the public domain, as explained at
a90cf9f29973990687fa61de9f1f6ea22e924e40Gordon Ross * http://creativecommons.org/publicdomain/zero/1.0/
a90cf9f29973990687fa61de9f1f6ea22e924e40Gordon Ross * Misc utilities in JSR166 performance tests
a90cf9f29973990687fa61de9f1f6ea22e924e40Gordon Ross // Some mindless computation to do between synchronizations...
a90cf9f29973990687fa61de9f1f6ea22e924e40Gordon Ross * generates 32 bit pseudo-random numbers.
a90cf9f29973990687fa61de9f1f6ea22e924e40Gordon Ross public static int compute1(int x) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Computes a linear congruential random number a random number
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * of times.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw public static int compute2(int x) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * An actually useful random number generator, but unsynchronized.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Basically same as java.util.Random.
7b59d02d2a384be9a08087b14defadd214b3c1ddjb public static class SimpleRandom {
7b59d02d2a384be9a08087b14defadd214b3c1ddjb private long seed = System.nanoTime() + seq.getAndIncrement();
7b59d02d2a384be9a08087b14defadd214b3c1ddjb public void setSeed(long s) {
148c5f43199ca0b43fc8e3b643aab11cd66ea327Alan Wright public int next() {
148c5f43199ca0b43fc8e3b643aab11cd66ea327Alan Wright public volatile long startTime;
148c5f43199ca0b43fc8e3b643aab11cd66ea327Alan Wright public volatile long endTime;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw public void run() {
faa1795a28a5c712eed6d0a3f84d98c368a316c6jb public void clear() {
faa1795a28a5c712eed6d0a3f84d98c368a316c6jb public long getTime() {
faa1795a28a5c712eed6d0a3f84d98c368a316c6jb // There's probably a better way to do this...
a90cf9f29973990687fa61de9f1f6ea22e924e40Gordon Ross b.replace(b.length()-num.length(), b.length(), num);