Added NativeLibrary helper class to com.sun.gluegen.runtime package,

principally to generally solve the problem of downloading dependent
libraries of GlueGen-generated native code, as in the case of JOAL and
OpenAL reported recently by Shawn Kendall on JOAL forums.
Autogenerated Java and native code associated with this new
NativeLibrary helper class is currently checked in to the GlueGen
workspace to make it easier to build across multiple platforms; it can
be regenerated by running the generate.nativelibrary.sources Ant
target in the GlueGen workspace. Building of the native code in the
GlueGen workspace is currently disabled by default and can be enabled
by specifying -Dbuild.native=1 on the ant command line. Use of the new
NativeLibrary class in JOAL is currently disabled by default and can
be enabled by specifying -Djoal.use.gluegen=1 to applications using
JOAL. New functionality has been lightly tested with JOAL on Windows
and appears to be working. More testing, including build and Java Web
Start deployment testing, to follow on other platforms.


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/../svn-server-sync/gluegen/trunk@37 a78bb65f-1512-4460-ba86-f6dc96a7bf27

6 files changed, 572 insertions, 0 deletions

diff --git a/src/java/com/sun/gluegen/runtime/DynamicLinker.java b/src/java/com/sun/gluegen/runtime/DynamicLinker.java
new file mode 100755
index 0000000..d0ee39b
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/DynamicLinker.java
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.gluegen.runtime;
+
+/** Provides an abstract interface to the OS's low-level dynamic
+    linking functionality. */
+
+interface DynamicLinker {
+  public long openLibrary(String pathname);
+  public long lookupSymbol(long libraryHandle, String symbolName);
+  public void closeLibrary(long libraryHandle);
+}
diff --git a/src/java/com/sun/gluegen/runtime/MacOSXDynamicLinkerImpl.java b/src/java/com/sun/gluegen/runtime/MacOSXDynamicLinkerImpl.java
new file mode 100755
index 0000000..37e3cd0
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/MacOSXDynamicLinkerImpl.java
@@ -0,0 +1,49 @@
+/* !---- DO NOT EDIT: This file autogenerated by com\sun\gluegen\JavaEmitter.java on Mon Jul 31 16:27:00 PDT 2006 ----! */
+
+package com.sun.gluegen.runtime;
+
+import com.sun.gluegen.runtime.*;
+
+public class MacOSXDynamicLinkerImpl implements DynamicLinker
+{
+
+  public static final int RTLD_LAZY = 0x1;
+  public static final int RTLD_NOW = 0x2;
+  public static final int RTLD_LOCAL = 0x4;
+  public static final int RTLD_GLOBAL = 0x8;
+
+  /** Interface to C language function: <br> <code> int dlclose(void *  __handle); </code>    */
+  private static native int dlclose(long __handle);
+
+  /** Interface to C language function: <br> <code> char *  dlerror(void); </code>    */
+  private static native java.lang.String dlerror();
+
+  /** Interface to C language function: <br> <code> void *  dlopen(const char *  __path, int __mode); </code>    */
+  private static native long dlopen(java.lang.String __path, int __mode);
+
+  /** Interface to C language function: <br> <code> void *  dlsym(void *  __handle, const char *  __symbol); </code>    */
+  private static native long dlsym(long __handle, java.lang.String __symbol);
+
+
+  // --- Begin CustomJavaCode .cfg declarations
+  public long openLibrary(String pathname) {
+    // Note we use RTLD_GLOBAL visibility to allow this functionality to
+    // be used to pre-resolve dependent libraries of JNI code without
+    // requiring that all references to symbols in those libraries be
+    // looked up dynamically via the ProcAddressTable mechanism; in
+    // other words, one can actually link against the library instead of
+    // having to dlsym all entry points. System.loadLibrary() uses
+    // RTLD_LOCAL visibility so can't be used for this purpose.
+    return dlopen(pathname, RTLD_GLOBAL);
+  }
+  
+  public long lookupSymbol(long libraryHandle, String symbolName) {
+    return dlsym(libraryHandle, symbolName);
+  }
+  
+  public void closeLibrary(long libraryHandle) {
+    dlclose(libraryHandle);
+  }
+  // ---- End CustomJavaCode .cfg declarations
+
+} // end of class MacOSXDynamicLinkerImpl
diff --git a/src/java/com/sun/gluegen/runtime/NativeLibLoader.java b/src/java/com/sun/gluegen/runtime/NativeLibLoader.java
new file mode 100755
index 0000000..4d57867
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/NativeLibLoader.java
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.gluegen.runtime;
+
+import java.security.*;
+
+/** Class providing control over whether GlueGen loads the native code
+    associated with the NativeLibrary implementation. Alternative app
+    launchers such as those running within applets may want to disable
+    this default loading behavior and load the native code via another
+    (manual) mechanism. */
+public class NativeLibLoader {
+  private static volatile boolean loadingEnabled = true;
+  private static volatile boolean didLoading;
+
+  public static void disableLoading() {
+    loadingEnabled = false;
+  }
+
+  public static void enableLoading() {
+    loadingEnabled = true;
+  }
+  
+  public static void loadGlueGenRT() {
+    if (!didLoading && loadingEnabled) {
+      synchronized (NativeLibLoader.class) {
+        if (!didLoading && loadingEnabled) {
+          didLoading = true;
+          AccessController.doPrivileged(new PrivilegedAction() {
+              public Object run() {
+                System.loadLibrary("gluegen-rt");
+                return null;
+              }
+            });
+        }
+      }
+    }
+  }
+}
diff --git a/src/java/com/sun/gluegen/runtime/NativeLibrary.java b/src/java/com/sun/gluegen/runtime/NativeLibrary.java
new file mode 100755
index 0000000..f61afb6
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/NativeLibrary.java
@@ -0,0 +1,305 @@
+/*
+ * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ * - Redistribution of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * 
+ * - Redistribution in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * 
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ * 
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ * 
+ * Sun gratefully acknowledges that this software was originally authored
+ * and developed by Kenneth Bradley Russell and Christopher John Kline.
+ */
+
+package com.sun.gluegen.runtime;
+
+import java.io.*;
+import java.lang.reflect.*;
+import java.security.*;
+import java.util.*;
+
+/** Provides low-level, relatively platform-independent access to
+    shared ("native") libraries. The core library routines
+    <code>System.load()</code> and <code>System.loadLibrary()</code>
+    in general provide suitable functionality for applications using
+    native code, but are not flexible enough to support certain kinds
+    of glue code generation and deployment strategies. This class
+    supports direct linking of native libraries to other shared
+    objects not necessarily installed on the system (in particular,
+    via the use of dlopen(RTLD_GLOBAL) on Unix platforms) as well as
+    manual lookup of function names to support e.g. GlueGen's
+    ProcAddressTable glue code generation style without additional
+    supporting code needed in the generated library. */
+
+public class NativeLibrary {
+  private static final int WINDOWS = 1;
+  private static final int UNIX    = 2;
+  private static final int MACOSX  = 3;
+  private static int platform;
+  private static DynamicLinker dynLink;
+  private static String prefix;
+  private static String[] suffixes;
+
+  static {
+    // Determine platform we're running on
+    AccessController.doPrivileged(new PrivilegedAction() {
+        public Object run() {
+          String osName = System.getProperty("os.name").toLowerCase();
+          if (osName.startsWith("wind")) {
+            platform = WINDOWS;
+          } else if (osName.startsWith("mac os x")) {
+            platform = MACOSX;
+          } else {
+            platform = UNIX;
+          }
+          return null;
+        }
+      });
+    // Instantiate dynamic linker implementation
+    switch (platform) {
+      case WINDOWS:
+        dynLink = new WindowsDynamicLinkerImpl();
+        prefix = "";
+        suffixes = new String[] { ".dll" };
+        break;
+      case UNIX:
+        dynLink = new UnixDynamicLinkerImpl();
+        prefix = "lib";
+        suffixes = new String[] { ".so" };
+        break;
+      case MACOSX:
+        dynLink = new MacOSXDynamicLinkerImpl();
+        prefix = "lib";
+        suffixes = new String[] { ".dylib", ".jnilib" };
+        break;
+      default:
+        throw new InternalError("Platform not initialized properly");
+    }
+  }
+
+  // Platform-specific representation for the handle to the open
+  // library. This is an HMODULE on Windows and a void* (the result of
+  // a dlopen() call) on Unix and Mac OS X platforms.
+  private long libraryHandle;
+
+  // May as well keep around the path to the library we opened
+  private String libraryPath;
+
+  // Private constructor to prevent arbitrary instances from floating around
+  private NativeLibrary(long libraryHandle, String libraryPath) {
+    this.libraryHandle = libraryHandle;
+    this.libraryPath   = libraryPath;
+  }
+
+  /** Opens the given native library, assuming it has the same base
+      name on all platforms, in the context of the specified
+      ClassLoader, which is used to help find the library in the case
+      of e.g. Java Web Start. */
+  public static NativeLibrary open(String libName, ClassLoader loader) {
+    return open(libName, libName, libName, loader);
+  }
+
+  /** Opens the given native library, assuming it has the given base
+      names (no "lib" prefix or ".dll/.so/.dylib" suffix) on the
+      Windows, Unix and Mac OS X platforms, respectively, and in the
+      context of the specified ClassLoader, which is used to help find
+      the library in the case of e.g. Java Web Start. */
+  public static NativeLibrary open(String windowsLibName,
+                                   String unixLibName,
+                                   String macOSXLibName,
+                                   ClassLoader loader) {
+    List possiblePaths = enumerateLibraryPaths(windowsLibName,
+                                               unixLibName,
+                                               macOSXLibName,
+                                               loader);
+    // Iterate down these and see which one if any we can actually find.
+    for (Iterator iter = possiblePaths.iterator(); iter.hasNext(); ) {
+      String path = (String) iter.next();
+      ensureNativeLibLoaded();
+      long res = dynLink.openLibrary(path);
+      if (res != 0) {
+        return new NativeLibrary(res, path);
+      }
+    }
+    // For now, just return null to indicate the open operation didn't
+    // succeed (could also throw an exception if we could tell which
+    // of the openLibrary operations actually failed)
+    return null;
+  }
+
+  /** Looks up the given function name in this native library. */
+  public long lookupFunction(String functionName) {
+    if (libraryHandle == 0)
+      throw new RuntimeException("Library is not open");
+    return dynLink.lookupSymbol(libraryHandle, functionName);
+  }
+
+  /** Retrieves the low-level library handle from this NativeLibrary
+      object. On the Windows platform this is an HMODULE, and on Unix
+      and Mac OS X platforms the void* result of calling dlopen(). */
+  public long getLibraryHandle() {
+    return libraryHandle;
+  }
+
+  /** Retrieves the path under which this library was opened. */
+  public String getLibraryPath() {
+    return libraryPath;
+  }
+
+  /** Closes this native library. Further lookup operations are not
+      allowed after calling this method. */
+  public void close() {
+    if (libraryHandle == 0)
+      throw new RuntimeException("Library already closed");
+    long handle = libraryHandle;
+    libraryHandle = 0;
+    dynLink.closeLibrary(handle);
+  }
+
+  /** Given the base library names (no prefixes/suffixes) for the
+      various platforms, enumerate the possible locations and names of
+      the indicated native library on the system. */
+  private static List enumerateLibraryPaths(String windowsLibName,
+                                            String unixLibName,
+                                            String macOSXLibName,
+                                            ClassLoader loader) {
+    String libName = selectName(windowsLibName, unixLibName, macOSXLibName);
+    String[] baseNames = buildNames(libName);
+
+    List paths = new ArrayList();
+
+    // The idea to ask the ClassLoader to find the library is borrowed
+    // from the LWJGL library
+    String clPath = getPathFromClassLoader(libName, loader);
+    if (clPath != null)
+      paths.add(clPath);
+    
+    // Add entries from java.library.path
+    String javaLibraryPath =
+      (String) AccessController.doPrivileged(new PrivilegedAction() {
+          public Object run() {
+            return System.getProperty("java.library.path");
+          }
+        });
+    if (javaLibraryPath != null) {
+      StringTokenizer tokenizer = new StringTokenizer(javaLibraryPath, File.pathSeparator);
+      while (tokenizer.hasMoreTokens()) {
+        addPaths(tokenizer.nextToken(), baseNames, paths);
+      }
+    }
+
+    // Add current working directory
+    String userDir =
+      (String) AccessController.doPrivileged(new PrivilegedAction() {
+          public Object run() {
+            return System.getProperty("user.dir");
+          }
+        });
+    addPaths(userDir, baseNames, paths);
+
+    // Add just the library names to use the OS's search algorithm
+    for (int i = 0; i < baseNames.length; i++) {
+      paths.add(baseNames[i]);
+    }
+
+    return paths;
+  }
+
+
+  private static String selectName(String windowsLibName,
+                                   String unixLibName,
+                                   String macOSXLibName) {
+    switch (platform) {
+      case WINDOWS:
+        return windowsLibName;
+      case UNIX:
+        return unixLibName;
+      case MACOSX:
+        return macOSXLibName;
+      default:
+        throw new InternalError();
+    }
+  }
+
+  private static String[] buildNames(String libName) {
+    String[] res = new String[suffixes.length];
+    for (int i = 0; i < suffixes.length; i++) {
+      res[i] = prefix + libName + suffixes[i];
+    }
+    return res;
+  }
+
+  private static void addPaths(String path, String[] baseNames, List paths) {
+    for (int j = 0; j < baseNames.length; j++) {
+      paths.add(path + File.separator + baseNames[j]);
+    }
+  }
+
+  private static boolean initializedFindLibraryMethod = false;
+  private static Method  findLibraryMethod = null;
+  private static String getPathFromClassLoader(final String libName, ClassLoader loader) {
+    if (loader == null)
+      return null;
+    if (!initializedFindLibraryMethod) {
+      AccessController.doPrivileged(new PrivilegedAction() {
+          public Object run() {
+            try {
+              findLibraryMethod = ClassLoader.class.getDeclaredMethod("findLibrary",
+                                                                      new Class[] { String.class });
+              findLibraryMethod.setAccessible(true);
+            } catch (Exception e) {
+              // Fail silently disabling this functionality
+            }
+            initializedFindLibraryMethod = true;
+            return null;
+          }
+        });
+    }
+    if (findLibraryMethod != null) {
+      try {
+        return (String) findLibraryMethod.invoke(loader, new Object[] { libName });
+      } catch (Exception e) {
+        // Fail silently and continue with other search algorithms
+      }
+    }
+    return null;
+  }
+
+  private static volatile boolean loadedDynLinkNativeLib;
+  private static void ensureNativeLibLoaded() {
+    if (!loadedDynLinkNativeLib) {
+      synchronized (NativeLibrary.class) {
+        if (!loadedDynLinkNativeLib) {
+          loadedDynLinkNativeLib = true;
+          NativeLibLoader.loadGlueGenRT();
+        }
+      }
+    }
+  }
+}
diff --git a/src/java/com/sun/gluegen/runtime/UnixDynamicLinkerImpl.java b/src/java/com/sun/gluegen/runtime/UnixDynamicLinkerImpl.java
new file mode 100755
index 0000000..006f90d
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/UnixDynamicLinkerImpl.java
@@ -0,0 +1,55 @@
+/* !---- DO NOT EDIT: This file autogenerated by com\sun\gluegen\JavaEmitter.java on Mon Jul 31 16:26:59 PDT 2006 ----! */
+
+package com.sun.gluegen.runtime;
+
+import com.sun.gluegen.runtime.*;
+
+public class UnixDynamicLinkerImpl implements DynamicLinker
+{
+
+  public static final int RTLD_LAZY = 0x00001;
+  public static final int RTLD_NOW = 0x00002;
+  public static final int RTLD_NOLOAD = 0x00004;
+  public static final int RTLD_GLOBAL = 0x00100;
+  public static final int RTLD_LOCAL = 0x00000;
+  public static final int RTLD_PARENT = 0x00200;
+  public static final int RTLD_GROUP = 0x00400;
+  public static final int RTLD_WORLD = 0x00800;
+  public static final int RTLD_NODELETE = 0x01000;
+  public static final int RTLD_FIRST = 0x02000;
+
+  /** Interface to C language function: <br> <code> int dlclose(void * ); </code>    */
+  private static native int dlclose(long arg0);
+
+  /** Interface to C language function: <br> <code> char *  dlerror(void); </code>    */
+  private static native java.lang.String dlerror();
+
+  /** Interface to C language function: <br> <code> void *  dlopen(const char * , int); </code>    */
+  private static native long dlopen(java.lang.String arg0, int arg1);
+
+  /** Interface to C language function: <br> <code> void *  dlsym(void * , const char * ); </code>    */
+  private static native long dlsym(long arg0, java.lang.String arg1);
+
+
+  // --- Begin CustomJavaCode .cfg declarations
+  public long openLibrary(String pathname) {
+    // Note we use RTLD_GLOBAL visibility to allow this functionality to
+    // be used to pre-resolve dependent libraries of JNI code without
+    // requiring that all references to symbols in those libraries be
+    // looked up dynamically via the ProcAddressTable mechanism; in
+    // other words, one can actually link against the library instead of
+    // having to dlsym all entry points. System.loadLibrary() uses
+    // RTLD_LOCAL visibility so can't be used for this purpose.
+    return dlopen(pathname, RTLD_GLOBAL);
+  }
+  
+  public long lookupSymbol(long libraryHandle, String symbolName) {
+    return dlsym(libraryHandle, symbolName);
+  }
+  
+  public void closeLibrary(long libraryHandle) {
+    dlclose(libraryHandle);
+  }
+  // ---- End CustomJavaCode .cfg declarations
+
+} // end of class UnixDynamicLinkerImpl
diff --git a/src/java/com/sun/gluegen/runtime/WindowsDynamicLinkerImpl.java b/src/java/com/sun/gluegen/runtime/WindowsDynamicLinkerImpl.java
new file mode 100755
index 0000000..c1d2fa0
--- /dev/null
+++ b/src/java/com/sun/gluegen/runtime/WindowsDynamicLinkerImpl.java
@@ -0,0 +1,38 @@
+/* !---- DO NOT EDIT: This file autogenerated by com\sun\gluegen\JavaEmitter.java on Mon Jul 31 16:26:59 PDT 2006 ----! */
+
+package com.sun.gluegen.runtime;
+
+import com.sun.gluegen.runtime.*;
+
+public class WindowsDynamicLinkerImpl implements DynamicLinker
+{
+
+
+  /** Interface to C language function: <br> <code> BOOL FreeLibrary(HANDLE hLibModule); </code>    */
+  private static native int FreeLibrary(long hLibModule);
+
+  /** Interface to C language function: <br> <code> DWORD GetLastError(void); </code>    */
+  private static native int GetLastError();
+
+  /** Interface to C language function: <br> <code> PROC GetProcAddress(HANDLE hModule, LPCSTR lpProcName); </code>    */
+  private static native long GetProcAddress(long hModule, java.lang.String lpProcName);
+
+  /** Interface to C language function: <br> <code> HANDLE LoadLibraryA(LPCSTR lpLibFileName); </code>    */
+  private static native long LoadLibraryA(java.lang.String lpLibFileName);
+
+
+  // --- Begin CustomJavaCode .cfg declarations
+  public long openLibrary(String libraryName) {
+    return LoadLibraryA(libraryName);
+  }
+  
+  public long lookupSymbol(long libraryHandle, String symbolName) {
+    return GetProcAddress(libraryHandle, symbolName);
+  }
+  
+  public void closeLibrary(long libraryHandle) {
+    FreeLibrary(libraryHandle);
+  }
+  // ---- End CustomJavaCode .cfg declarations
+
+} // end of class WindowsDynamicLinkerImpl