include/linux/mempool.h

   1 /*
   2  * memory buffer pool support
   3  */
   4 #ifndef _LINUX_MEMPOOL_H
   5 #define _LINUX_MEMPOOL_H
   6
   7 #include <linux/wait.h>
   8
   9 typedef void * (mempool_alloc_t)(unsigned int __nocast gfp_mask, void *pool_data);
  10 typedef void (mempool_free_t)(void *element, void *pool_data);
  11
  12 typedef struct mempool_s {
  13         spinlock_t lock;
  14         int min_nr;             /* nr of elements at *elements */
  15         int curr_nr;            /* Current nr of elements at *elements */
  16         void **elements;
  17
  18         void *pool_data;
  19         mempool_alloc_t *alloc;
  20         mempool_free_t *free;
  21         wait_queue_head_t wait;
  22 } mempool_t;
  23 extern mempool_t * mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
  24                                  mempool_free_t *free_fn, void *pool_data);
  25 extern int mempool_resize(mempool_t *pool, int new_min_nr, unsigned int __nocast gfp_mask);
  26 extern void mempool_destroy(mempool_t *pool);
  27 extern void * mempool_alloc(mempool_t *pool, unsigned int __nocast gfp_mask);
  28 extern void mempool_free(void *element, mempool_t *pool);
  29
  30 /*
  31  * A mempool_alloc_t and mempool_free_t that get the memory from
  32  * a slab that is passed in through pool_data.
  33  */
  34 void *mempool_alloc_slab(unsigned int __nocast gfp_mask, void *pool_data);
  35 void mempool_free_slab(void *element, void *pool_data);
  36
  37 #endif /* _LINUX_MEMPOOL_H */