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FileLock.h

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#ifndef CLASSLIB_FILE_LOCK_H
# define CLASSLIB_FILE_LOCK_H

//<<<<<< INCLUDES                                                       >>>>>>

# include "classlib/sysapi/IOTypes.h"

namespace lat {
//<<<<<< PUBLIC DEFINES                                                 >>>>>>
//<<<<<< PUBLIC CONSTANTS                                               >>>>>>
//<<<<<< PUBLIC TYPES                                                   >>>>>>

class File;

//<<<<<< PUBLIC VARIABLES                                               >>>>>>
//<<<<<< PUBLIC FUNCTIONS                                               >>>>>>
//<<<<<< CLASS DECLARATIONS                                             >>>>>>

class FileLock
{
public:
    FileLock (void);
    FileLock (File *file, IOOffset pos, IOOffset len,
              bool write = true, bool wait = false);
    ~FileLock (void);

    void                lock (File *file,
                              IOOffset pos,
                              IOOffset length,
                              bool write = true,
                              bool wait = false);
    void                unlock (void);
    static bool         locked (File *file,
                                IOOffset pos,
                                IOOffset length,
                                bool write = true);

private:
    static void         unlock (File *file, IOOffset pos, IOOffset length);

    File                *m_file;
    IOOffset            m_offset;
    IOOffset            m_length;

    // undefined, no semantics (yet?)
    FileLock (const FileLock &);
    FileLock &operator= (const FileLock &);
};

//<<<<<< INLINE PUBLIC FUNCTIONS                                        >>>>>>
//<<<<<< INLINE MEMBER FUNCTIONS                                        >>>>>>

} // namespace lat
#endif // CLASSLIB_FILE_LOCK_H

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