BlkMemMgr.h

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//
//      $Id$
//
 
#ifndef _BlkMemMgr_h_
#define _BlkMemMgr_h_
 
#include <vapor/MyBase.h>
 
namespace VAPoR {
 
//
//
class BlkMemMgr : public Wasp::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);
};
};    // namespace VAPoR
 
#endif    //    _BlkMemMgr_h_