author | dl |
Sat, 22 Jul 2017 09:18:50 -0700 | |
changeset 45937 | 646816090183 |
parent 35394 | 282c3cb6a0c1 |
permissions | -rw-r--r-- |
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/* |
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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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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file: |
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* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.Test; |
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import junit.framework.TestSuite; |
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public class SystemTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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main(suite(), args); |
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} |
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public static Test suite() { |
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return new TestSuite(SystemTest.class); |
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} |
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/** |
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* Worst case rounding for millisecs; set for 60 cycle millis clock. |
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* This value might need to be changed on JVMs with coarser |
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* System.currentTimeMillis clocks. |
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*/ |
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static final long MILLIS_ROUND = 17; |
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/** |
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* Nanos between readings of millis is no longer than millis (plus |
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* possible rounding), and vice versa. |
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* This shows only that nano timing not (much) worse than milli. |
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*/ |
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public void testNanoTime() throws InterruptedException { |
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long m0 = System.currentTimeMillis(); |
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long n0 = System.nanoTime(); |
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Thread.sleep(1); |
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long m1 = System.currentTimeMillis(); |
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long n1 = System.nanoTime(); |
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Thread.sleep(50); // avoid possibly scaled SHORT_DELAY_MS |
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long m2 = System.currentTimeMillis(); |
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long n2 = System.nanoTime(); |
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Thread.sleep(1); |
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long m3 = System.currentTimeMillis(); |
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long n3 = System.nanoTime(); |
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assertTrue((n2 - n1) / 1_000_000 <= m3 - m0 + MILLIS_ROUND); |
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assertTrue(m2 - m1 <= (n3 - n0) / 1_000_000 + MILLIS_ROUND); |
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} |
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} |