• file
• revisions
• annotate
• diff
• comparison
• raw

test/compiler/6863420/Test.java@665be97e8704 (annotated)

test/compiler/6863420/Test.java

Sun, 26 Jul 2009 16:40:14 -0700

author

kvn

date

Sun, 26 Jul 2009 16:40:14 -0700

changeset 1329

665be97e8704

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6863420: os::javaTimeNanos() go backward on Solaris x86
Summary: Use new atomic long load method Atomic::load() to load max_hrtime.
Reviewed-by: never, ysr, johnc, phh, dcubed, acorn

kvn@1329	1	/*
kvn@1329	2	* Copyright 2009 D.E. Shaw. All Rights Reserved.
kvn@1329	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
kvn@1329	4	*
kvn@1329	5	* This code is free software; you can redistribute it and/or modify it
kvn@1329	6	* under the terms of the GNU General Public License version 2 only, as
kvn@1329	7	* published by the Free Software Foundation.
kvn@1329	8	*
kvn@1329	9	* This code is distributed in the hope that it will be useful, but WITHOUT
kvn@1329	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
kvn@1329	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
kvn@1329	12	* version 2 for more details (a copy is included in the LICENSE file that
kvn@1329	13	* accompanied this code).
kvn@1329	14	*
kvn@1329	15	* You should have received a copy of the GNU General Public License version
kvn@1329	16	* 2 along with this work; if not, write to the Free Software Foundation,
kvn@1329	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
kvn@1329	18	*
kvn@1329	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
kvn@1329	20	* CA 95054 USA or visit www.sun.com if you need additional information or
kvn@1329	21	* have any questions.
kvn@1329	22	*
kvn@1329	23	*/
kvn@1329	24
kvn@1329	25	/**
kvn@1329	26	* @test
kvn@1329	27	* @bug 6863420
kvn@1329	28	* @summary os::javaTimeNanos() go backward on Solaris x86
kvn@1329	29	*
kvn@1329	30	* @run main/othervm Test
kvn@1329	31	*/
kvn@1329	32
kvn@1329	33	public class Test {
kvn@1329	34	static long value = 0;
kvn@1329	35	static boolean got_backward_time = false;
kvn@1329	36
kvn@1329	37	public static void main(String args[]) {
kvn@1329	38	final int count = 100000;
kvn@1329	39
kvn@1329	40	for (int numThreads = 1; numThreads <= 32; numThreads++) {
kvn@1329	41	final int numRuns = 1;
kvn@1329	42	for (int t=1; t <= numRuns; t++) {
kvn@1329	43	final int curRun = t;
kvn@1329	44
kvn@1329	45	System.out.println("Spawning " + numThreads + " threads");
kvn@1329	46	final Thread threads[] = new Thread[numThreads];
kvn@1329	47	for (int i = 0; i < threads.length; i++) {
kvn@1329	48	Runnable thread =
kvn@1329	49	new Runnable() {
kvn@1329	50	public void run() {
kvn@1329	51	for (long l = 0; l < 100000; l++) {
kvn@1329	52	final long start = System.nanoTime();
kvn@1329	53	if (value == 12345678) {
kvn@1329	54	System.out.println("Wow!");
kvn@1329	55	}
kvn@1329	56	final long end = System.nanoTime();
kvn@1329	57	final long time = end - start;
kvn@1329	58	value += time;
kvn@1329	59	if (time < 0) {
kvn@1329	60	System.out.println(
kvn@1329	61	"Backwards: " +
kvn@1329	62	"start=" + start + " " +
kvn@1329	63	"end=" + end + " " +
kvn@1329	64	"time= " + time
kvn@1329	65	);
kvn@1329	66	got_backward_time = true;
kvn@1329	67	}
kvn@1329	68	}
kvn@1329	69	}
kvn@1329	70	};
kvn@1329	71	threads[i] = new Thread(thread, "Thread" + i);
kvn@1329	72	}
kvn@1329	73	for (int i = 0; i < threads.length; i++) {
kvn@1329	74	threads[i].start();
kvn@1329	75	}
kvn@1329	76	for (int i = 0; i < threads.length; i++) {
kvn@1329	77	try {
kvn@1329	78	threads[i].join();
kvn@1329	79	}
kvn@1329	80	catch (InterruptedException e) {
kvn@1329	81	continue;
kvn@1329	82	}
kvn@1329	83	}
kvn@1329	84	}
kvn@1329	85	}
kvn@1329	86
kvn@1329	87	if (got_backward_time) {
kvn@1329	88	System.exit(97);
kvn@1329	89	}
kvn@1329	90	}
kvn@1329	91	}