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mmap_cache_internals.h  view on Meta::CPAN

};

struct mmap_cache_it {
  mmap_cache * cache;
  MU32         p_cur;
  MU32 *       slot_ptr;
  MU32 *       slot_ptr_end;
};

/* Macros to access page entries */
#define PP(p) ((MU32 *)p)

#define P_Magic(p) (*(PP(p)+0))
#define P_NumSlots(p) (*(PP(p)+1))
#define P_FreeSlots(p) (*(PP(p)+2))
#define P_OldSlots(p) (*(PP(p)+3))
#define P_FreeData(p) (*(PP(p)+4))
#define P_FreeBytes(p) (*(PP(p)+5))
#define P_NReads(p) (*(PP(p)+6))
#define P_NReadHits(p) (*(PP(p)+7))

#define P_HEADERSIZE 32

/* Macros to access cache slot entries */
#define SP(s) ((MU32 *)s)

/* Offset pointer 'p' by 'o' bytes */
#define PTR_ADD(p,o) ((void *)((char *)p + o))

/* Given a data pointer, get key len, value len or combined len */
#define S_Ptr(b,s)      ((MU32 *)PTR_ADD(b, s))

#define S_LastAccess(s) (*(s+0))
#define S_ExpireOn(s)   (*(s+1))