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/*
* Copyright Amazon.com Inc. 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.
*/
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
/**
* @test
* @summary Check that timer slack options work
* @requires os.family == "linux"
* @requires vm.flagless
* @library /test/lib
* @run driver TestTimerSlack
*/
public class TestTimerSlack {
public static void main(String[] args) throws Exception {
int defaultSlack;
// Check the timer slack value is not printed by default
{
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:os+thread",
"TestTimerSlack$TestMain");
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldHaveExitValue(0);
output.shouldNotContain("timer slack:");
}
// Check the timer slack value is not printed when explicitly disabled
{
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:os+thread",
"-XX:+UnlockExperimentalVMOptions",
"-XX:TimerSlack=-1",
"TestTimerSlack$TestMain");
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldHaveExitValue(0);
output.shouldNotContain("timer slack:");
}
// Check the timer slack value is good when system-wide default is requested
{
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:os+thread",
"-XX:+UnlockExperimentalVMOptions",
"-XX:TimerSlack=0",
"TestTimerSlack$TestMain");
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldHaveExitValue(0);
output.shouldContain("timer slack:");
defaultSlack = parseSlackValue(output);
if (defaultSlack == 0) {
fail(output, "Default slack value (" + defaultSlack + ") is unexpected");
}
}
// Check the timer slack value is accepted by all threads
for (int slack : new int[] {1, 10, 100, 1000, 10000, 100000, 1000000}) {
ProcessBuilder pb = ProcessTools.createLimitedTestJavaProcessBuilder("-Xlog:os+thread",
"-XX:+UnlockExperimentalVMOptions",
"-XX:TimerSlack=" + slack,
"TestTimerSlack$TestMain");
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldHaveExitValue(0);
output.shouldContain("timer slack:");
int actualSlack = parseSlackValue(output);
if (actualSlack != slack) {
fail(output, "Actual slack value (" + actualSlack + ") is not the requested one (" + slack + ")");
}
}
}
static final Pattern EXTRACT_PATTERN = Pattern.compile("(.*)timer slack: ([0-9]+)ns(.*)");
public static int parseSlackValue(OutputAnalyzer output) {
Integer value = null;
for (String s : output.asLines()) {
Matcher m = EXTRACT_PATTERN.matcher(s);
if (m.matches()) {
Integer parsedValue = Integer.parseInt(m.group(2));
if (value == null) {
value = parsedValue;
} else if (!value.equals(parsedValue)) {
fail(output, "Multiple timer slack values detected");
}
}
}
if (value == null) {
fail(output, "No timer slack values detected");
}
return value;
}
private static void fail(OutputAnalyzer output, String msg) {
output.reportDiagnosticSummary();
throw new IllegalStateException(msg);
}
public static class TestMain {
static final int THREADS = 8;
public static void main(String... args) throws Exception {
Thread[] ts = new Thread[THREADS];
for (int c = 0; c < THREADS; c++) {
ts[c] = new Thread();
ts[c].start();
}
for (int c = 0; c < THREADS; c++) {
ts[c].join();
}
}
}
}
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