1 /*
 2  * Copyright Amazon.com Inc. 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
21  * questions.
22  *
23  */
24 
25 package sun.jvm.hotspot.runtime;
26 
27 import sun.jvm.hotspot.types.TypeDataBase;
28 
29 
30 /** Encapsulates the LockingMode enum in globalDefinitions.hpp in
31     the VM. */
32 
33 public class LockingMode {
34   private static int monitor;
35   private static int legacy;
36   private static int lightweight;
37 
38   static {
39     VM.registerVMInitializedObserver(
40         (o, d) -> initialize(VM.getVM().getTypeDataBase()));
41   }
42 
43   private static synchronized void initialize(TypeDataBase db) {
44     monitor     = db.lookupIntConstant("LM_MONITOR").intValue();
45     legacy      = db.lookupIntConstant("LM_LEGACY").intValue();
46     lightweight = db.lookupIntConstant("LM_LIGHTWEIGHT").intValue();
47   }
48 
49   public static int getMonitor() {
50     return monitor;
51   }
52 
53   public static int getLegacy() {
54     return legacy;
55   }
56 
57   public static int getLightweight() {
58     return lightweight;
59   }
60 }