only create one instance
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				@ -13,6 +13,8 @@ public class OperatingSystem {
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    private static final String ETC =
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        System.getProperty("sigar.etc.dir", "/etc") + "/";
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    private static OperatingSystem instance = null;
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    private String name;
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    private String version;
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    private String arch;
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@ -23,19 +25,23 @@ public class OperatingSystem {
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    private OperatingSystem() {
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    }
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    public static OperatingSystem getInstance() {
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        OperatingSystem os = new OperatingSystem();
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        Properties props = System.getProperties();
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        os.name = props.getProperty("os.name");
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        os.version = props.getProperty("os.version");
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        os.arch = props.getProperty("os.arch");
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        os.patchLevel = props.getProperty("sun.os.patch.level");
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    public static synchronized OperatingSystem getInstance() {
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        if (instance == null) {
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            OperatingSystem os = new OperatingSystem();
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            Properties props = System.getProperties();
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            os.name = props.getProperty("os.name");
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            os.version = props.getProperty("os.version");
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            os.arch = props.getProperty("os.arch");
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            os.patchLevel = props.getProperty("sun.os.patch.level");
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        if (os.name.equals("Linux")) {
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            os.getLinuxInfo();
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            if (os.name.equals("Linux")) {
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                os.getLinuxInfo();
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            }
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            instance = os;
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        }
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        return os;
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        return instance;
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    }
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    public String getName() {
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