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8263090: Avoid reading volatile fields twice in Locale.getDefault(Category)

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Reviewed-by: rriggs, naoto, serb
This commit is contained in:
Claes Redestad 2021-03-08 10:32:55 +00:00
parent 61cff4da90
commit 13625bebd0
2 changed files with 87 additions and 20 deletions
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58
test/micro/org/openjdk/bench/java/util/LocaleDefaults.java Normal file
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/*
* Copyright (c) 2021, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package org.openjdk.bench.java.util;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import java.util.Locale;
import java.util.concurrent.TimeUnit;
/*
* This benchmark tests Locale.getDefault variants
*/
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Benchmark)
public class LocaleDefaults {
@Benchmark
public Locale getDefault() {
return Locale.getDefault();
}
@Benchmark
public Locale getDefaultDisplay() {
return Locale.getDefault(Locale.Category.DISPLAY);
}
@Benchmark
public Locale getDefaultFormat() {
return Locale.getDefault(Locale.Category.FORMAT);
}
}