mem-pool.h

   1 #ifndef MEM_POOL_H
   2 #define MEM_POOL_H
   3
   4 struct mp_block {
   5         struct mp_block *next_block;
   6         char *next_free;
   7         char *end;
   8         uintmax_t space[FLEX_ARRAY]; /* more */
   9 };
  10
  11 struct mem_pool {
  12         struct mp_block *mp_block;
  13
  14         /*
  15          * The amount of available memory to grow the pool by.
  16          * This size does not include the overhead for the mp_block.
  17          */
  18         size_t block_alloc;
  19
  20         /* The total amount of memory allocated by the pool. */
  21         size_t pool_alloc;
  22 };
  23
  24 /*
  25  * Initialize mem_pool with specified initial size.
  26  */
  27 void mem_pool_init(struct mem_pool **mem_pool, size_t initial_size);
  28
  29 /*
  30  * Discard a memory pool and free all the memory it is responsible for.
  31  */
  32 void mem_pool_discard(struct mem_pool *mem_pool, int invalidate_memory);
  33
  34 /*
  35  * Alloc memory from the mem_pool.
  36  */
  37 void *mem_pool_alloc(struct mem_pool *pool, size_t len);
  38
  39 /*
  40  * Allocate and zero memory from the memory pool.
  41  */
  42 void *mem_pool_calloc(struct mem_pool *pool, size_t count, size_t size);
  43
  44 /*
  45  * Move the memory associated with the 'src' pool to the 'dst' pool. The 'src'
  46  * pool will be empty and not contain any memory. It still needs to be free'd
  47  * with a call to `mem_pool_discard`.
  48  */
  49 void mem_pool_combine(struct mem_pool *dst, struct mem_pool *src);
  50
  51 /*
  52  * Check if a memory pointed at by 'mem' is part of the range of
  53  * memory managed by the specified mem_pool.
  54  */
  55 int mem_pool_contains(struct mem_pool *mem_pool, void *mem);
  56
  57 #endif