2 files changed, 53 insertions, 4 deletions
diff --git a/libjava/java/nio/channels/FileChannelImpl.java b/libjava/java/nio/channels/FileChannelImpl.java
index 89ac11a..ea2526e 100644
--- a/libjava/java/nio/channels/FileChannelImpl.java
+++ b/libjava/java/nio/channels/FileChannelImpl.java
@@ -38,6 +38,9 @@ exception statement from your version. */
 
 package java.nio.channels;
 
+import gnu.classpath.Configuration;
+import gnu.gcj.RawData;
+import gnu.java.nio.FileLockImpl;
 import java.io.EOFException;
 import java.io.FileDescriptor;
 import java.io.FileInputStream;
@@ -47,8 +50,6 @@ import java.io.RandomAccessFile;
 import java.nio.ByteBuffer;
 import java.nio.MappedByteBuffer;
 import java.nio.MappedByteBufferImpl;
-import gnu.classpath.Configuration;
-import gnu.gcj.RawData;
 
 /**
  * This file is not user visible !
@@ -354,8 +355,22 @@ public class FileChannelImpl extends FileChannel
         file_obj instanceof FileInputStream)
       throw new NonWritableChannelException ();
 	
-    throw new Error ("Not implemented");
+    boolean completed = false;
+    
+    try
+      {
+	begin();
+        lockImpl(position, size, shared);
+	completed = true;
+	return new FileLockImpl(fd, this, position, size, shared);
+      }
+    finally
+      {
+	end(completed);
+      }
   }
+
+  private native void lockImpl(long position, long size, boolean shared);
   
   public FileLock tryLock (long position, long size, boolean shared)
     throws IOException
@@ -367,9 +382,27 @@ public class FileChannelImpl extends FileChannel
     if (!isOpen ())
       throw new ClosedChannelException ();
 
-    throw new Error ("Not implemented");
+    if (! tryLockImpl(position, size, shared))
+      return null;
+
+    boolean completed = false;
+
+    try
+      {
+	boolean lockable = tryLockImpl(position, size, shared);
+	completed = true;
+	return (lockable
+		? new FileLockImpl(fd, this, position, size, shared)
+		: null);
+      }
+    finally
+      {
+	end(completed);
+      }
   }
 
+  private native boolean tryLockImpl(long position, long size, boolean shared);
+  
   public long position ()
     throws IOException
   {
diff --git a/libjava/java/nio/channels/natFileChannelImpl.cc b/libjava/java/nio/channels/natFileChannelImpl.cc
index 8dbbd14..56828a4 100644
--- a/libjava/java/nio/channels/natFileChannelImpl.cc
+++ b/libjava/java/nio/channels/natFileChannelImpl.cc
@@ -25,11 +25,13 @@ details.  */
 #endif
 
 #include <gnu/gcj/RawData.h>
+#include <gnu/java/nio/FileLockImpl.h>
 #include <java/io/FileDescriptor.h>
 #include <java/io/IOException.h>
 #include <java/nio/ByteBuffer.h>
 #include <java/nio/channels/FileChannel.h>
 #include <java/nio/channels/FileChannelImpl.h>
+#include <java/nio/channels/FileLock.h>
 
 jlong
 java::nio::channels::FileChannelImpl::size ()
@@ -92,3 +94,17 @@ java::nio::channels::FileChannelImpl::nio_msync (gnu::gcj::RawData* /*map_addres
 {
   throw new ::java::io::IOException (JvNewStringUTF ("msync not implemented"));
 }
+
+void
+java::nio::channels::FileChannelImpl::lockImpl(jlong position, jlong size, jboolean shared)
+{
+  // FIXME: shared is unused, write is always true.
+  fd->lock(position, size, true);
+}
+
+jboolean
+java::nio::channels::FileChannelImpl::tryLockImpl(jlong position, jlong size, jboolean shared)
+{
+  // FIXME: shared is unused, write is always true.
+  return fd->tryLock(position, size, true);
+}