BlkMemMgr.h

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//
//      $Id$
//

#ifndef _BlkMemMgr_h_
#define _BlkMemMgr_h_

#include <vapor/MyBase.h>

namespace VAPoR {

//
// 
class BlkMemMgr : public VetsUtil::MyBase {

public:
 //
 //
 BlkMemMgr();
 virtual ~BlkMemMgr();

 //
 //
 void   *Alloc(size_t num_blks, bool fill = false);

 //
 void   FreeMem(void *ptr);

 //
 //
 static int RequestMemSize(
    size_t blk_size, size_t num_blks, bool page_aligned = true
 );

 static size_t GetBlkSize() {return(_blk_size);}

private:
 typedef struct {
    size_t _nfree;  // number of contiguous free blocks
    size_t _nused;  // number of contiguous used blocks
    void *_blk;     // pointer to first free/used block
 } _mem_allocation_t; 
 
 static vector < vector <_mem_allocation_t > > _mem_regions;
 static vector <size_t> _mem_region_sizes;  // size of mem in blocks
 static vector <unsigned char *> _blks; // memory pool

 static size_t  _mem_size_max_req;  // max requested size of mem in blocks
 static bool    _page_aligned_req;  // requested page align memory 
 static size_t  _blk_size_req;  // requested size of block in bytes

 static size_t  _mem_size_max;  // max size of mem in blocks
 static bool    _page_aligned;  // page align memory 
 static size_t  _blk_size;  // size of block in bytes

 static int _ref_count; // # instances of object.

 static int _Reinit(size_t n);

};
};

#endif  //  _BlkMemMgr_h_