new branch to integrate BlockDevice, BlockCache

git-svn-id: https://profuse.googlecode.com/svn/branches/profuse_interim@334 aa027e90-d47c-11dd-86d7-074df07e0730

File/MappedFile.h

@@ -0,0 +1,53 @@
+#ifndef __MAPPED_FILE_H__
+#define __MAPPED_FILE_H__
+
+
+#include <new>
+#include <sys/mman.h>
+
+#include <File/File.h>
+
+class File;
+
+class MappedFile {
+    public:
+    
+    MappedFile();
+    MappedFile(MappedFile&);
+    MappedFile(const File &f, File::FileFlags flags, size_t size = -1);
+    MappedFile(const char *name, File::FileFlags flags);
+    MappedFile(const char *name, File::FileFlags flags, const std::nothrow_t &nothrow);
+    
+    ~MappedFile();
+    
+    
+    static MappedFile *Create(const char *name, size_t size);
+    
+    bool isValid() const
+    {
+        return _address != MAP_FAILED;
+    }
+    
+    void sync();
+    void close();
+    
+    void *address() const { return _address; }
+    size_t length() const { return _length; }
+    bool readOnly() const { return _readOnly; }
+    
+    void swap(MappedFile &);
+    void adopt(MappedFile &);
+    
+    private:
+    
+    MappedFile& operator=(MappedFile &);
+    
+    void init(const File &f, bool readOnly, size_t size);
+    
+    void *_address;
+    size_t _length;
+    bool _readOnly;
+};
+
+
+#endif