malloc_impl.h raw

   1  #ifndef MALLOC_IMPL_H
   2  #define MALLOC_IMPL_H
   3  
   4  #include <sys/mman.h>
   5  #include "dynlink.h"
   6  
   7  struct chunk {
   8  	size_t psize, csize;
   9  	struct chunk *next, *prev;
  10  };
  11  
  12  struct bin {
  13  	volatile int lock[2];
  14  	struct chunk *head;
  15  	struct chunk *tail;
  16  };
  17  
  18  #define SIZE_ALIGN (4*sizeof(size_t))
  19  #define SIZE_MASK (-SIZE_ALIGN)
  20  #define OVERHEAD (2*sizeof(size_t))
  21  #define MMAP_THRESHOLD (0x1c00*SIZE_ALIGN)
  22  #define DONTCARE 16
  23  #define RECLAIM 163840
  24  
  25  #define CHUNK_SIZE(c) ((c)->csize & -2)
  26  #define CHUNK_PSIZE(c) ((c)->psize & -2)
  27  #define PREV_CHUNK(c) ((struct chunk *)((char *)(c) - CHUNK_PSIZE(c)))
  28  #define NEXT_CHUNK(c) ((struct chunk *)((char *)(c) + CHUNK_SIZE(c)))
  29  #define MEM_TO_CHUNK(p) (struct chunk *)((char *)(p) - OVERHEAD)
  30  #define CHUNK_TO_MEM(c) (void *)((char *)(c) + OVERHEAD)
  31  #define BIN_TO_CHUNK(i) (MEM_TO_CHUNK(&mal.bins[i].head))
  32  
  33  #define C_INUSE  ((size_t)1)
  34  
  35  #define IS_MMAPPED(c) !((c)->csize & (C_INUSE))
  36  
  37  hidden void __bin_chunk(struct chunk *);
  38  
  39  #endif
  40