synchdisk.h

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#include "copyright.h"

#ifndef SYNCHDISK_H
#define SYNCHDISK_H

#include "disk.h"
#include "synch.h"

class SynchDisk {
  public:
    SynchDisk(const char* name);            // Initialize a synchronous disk,
                    // by initializing the raw Disk.
    ~SynchDisk();           // De-allocate the synch disk data
    
    void ReadSector(int sectorNumber, char* data);
                        // Read/write a disk sector, returning
                        // only once the data is actually read 
                    // or written.  These call
                        // Disk::ReadRequest/WriteRequest and
                    // then wait until the request is done.
    void WriteSector(int sectorNumber, char* data);
    
    void RequestDone();         // Called by the disk device interrupt
                    // handler, to signal that the
                    // current disk operation is complete.

  private:
    Disk *disk;             // Raw disk device
    Semaphore *semaphore;       // To synchronize requesting thread 
                    // with the interrupt handler
    Lock *lock;             // Only one read/write request
                    // can be sent to the disk at a time
};

#endif // SYNCHDISK_H