/*
 * Copyright 2003-2005 Sun Microsystems, Inc.  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.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package com.sun.management;

import sun.management.VMManagement;

/**
 * Implementation class for the operating system.
 * Standard and committed hotspot-specific metrics if any.
 *
 * ManagementFactory.getOperatingSystemMXBean() returns an instance
 * of this class.
 */
class OperatingSystem
    extends    sun.management.OperatingSystemImpl
    implements OperatingSystemMXBean {

    // psapiLock is a lock to make sure only one thread loading
    // PSAPI DLL.
    private static Object psapiLock = new Object();

    OperatingSystem(VMManagement vm) {
        super(vm);
    }

    public long getCommittedVirtualMemorySize() {
        synchronized (psapiLock) {
            return getCommittedVirtualMemorySize0();
        }
    }
    private native long getCommittedVirtualMemorySize0();

    public native long getTotalSwapSpaceSize();
    public native long getFreeSwapSpaceSize();
    public native long getProcessCpuTime();
    public native long getFreePhysicalMemorySize();
    public native long getTotalPhysicalMemorySize();

    static {
        initialize();
    }
    private static native void initialize();
}