1 /*
2  * Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.
8  *
9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
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22  */
23 package jdk.jfr.event.os;
24 
25 import java.util.List;
26 
27 import jdk.jfr.Recording;
28 import jdk.jfr.consumer.RecordedEvent;
29 import jdk.test.lib.jfr.EventNames;
30 import jdk.test.lib.jfr.Events;
31 
32 /**
33  * @test
34  * @key jfr
35  * @requires vm.hasJFR
36  * @library /test/lib
37  * @run main/othervm jdk.jfr.event.os.TestThreadContextSwitches
38  */
39 public class TestThreadContextSwitches {
40     private final static String EVENT_NAME = EventNames.ThreadContextSwitchRate;
41 
main(String[] args)42     public static void main(String[] args) throws Throwable {
43         Recording recording = new Recording();
44         recording.enable(EVENT_NAME);
45         recording.start();
46         recording.stop();
47         List<RecordedEvent> events = Events.fromRecording(recording);
48         Events.hasEvents(events);
49         for (RecordedEvent event : events) {
50             System.out.println("Event: " + event);
51             Events.assertField(event, "switchRate").atLeast(0.0f);
52         }
53     }
54 }
55