add missing CLibrary.java

git-svn-id: https://svn.apache.org/repos/asf/cassandra/branches/cassandra-0.6@986902 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/cassandra/utils/CLibrary.java

@@ -0,0 +1,56 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.cassandra.utils;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.sun.jna.Native;
+
+public final class CLibrary
+{
+    private static Logger logger = LoggerFactory.getLogger(CLibrary.class);
+
+    public static final int MCL_CURRENT = 1;
+    public static final int MCL_FUTURE = 2;
+
+    public static final int ENOMEM = 12;
+
+    static
+    {
+        try
+        {
+            Native.register("c");
+        }
+        catch (NoClassDefFoundError e)
+        {
+            logger.info("JNA not found. Native methods will be disabled.");
+        }
+        catch (UnsatisfiedLinkError e)
+        {
+            logger.info("Unable to link C library. Native methods will be disabled.");
+        }
+    }
+
+    public static native int mlockall(int flags);
+
+    public static native int munlockall();
+
+    private CLibrary() {}
+}