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blockpool.h

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#ifndef _BLOCKPOOL_H_
#define _BLOCKPOOL_H_



#include <assert.h>
#include <stdio.h>
#include <stdlib.h>


class block_pool {
public: // typedefs and variables
  typedef enum { one_kay = 1024,
                 page_size = (4 * one_kay),  /* 4 Kb */
                 max_block_multiple = 256,   /* 1 Mb */
                 last_enum
               } bogus;

  typedef struct block_chain_struct {
    void *block;

    unsigned int bytes_used;

    unsigned int block_size;
       
    block_chain_struct *next_block;
  } block_chain;

private:
  static unsigned int alloc_gran;

  static block_chain *block_list_start; 

  static block_chain *current_block;    


private: // class functions
  block_chain *new_block( unsigned int block_size );
  void *add_block( unsigned int block_size );
  void init_pool(void);


protected:
  virtual void *MemAlloc( unsigned int n_bytes )
  {
    void *rtn = calloc( n_bytes, 1 );
    return rtn;
  }
  virtual void MemFree( void *addr )
  {
    free( addr );
  }


public: // class functions
  block_pool(void) {}

  void free_pool(void);
  void *pool_alloc( unsigned int block_size );
  void print_block_pool_info( FILE *fp = stdout );

}; // class block_pool



/* Macros for block_chain pointers */

#define Chain_block(p)            ((p)->block)

#define Chain_bytes_used(p)       ((p)->bytes_used)

#define Chain_block_size(p)       ((p)->block_size)

#define Chain_next(p)             ((p)->next_block)


#endif

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