git.m6w6.name Git - awesomized/libmemcached/blob - memcached/slabs.h

   1 /* slabs memory allocation */
   2 #ifndef SLABS_H
   3 #define SLABS_H
   4
   5 /** Init the subsystem. 1st argument is the limit on no. of bytes to allocate,
   6     0 if no limit. 2nd argument is the growth factor; each slab will use a chunk
   7     size equal to the previous slab's chunk size times this factor.
   8     3rd argument specifies if the slab allocator should allocate all memory
   9     up front (if true), or allocate memory in chunks as it is needed (if false)
  10 */
  11 void slabs_init(const size_t limit, const double factor, const bool prealloc);
  12
  13
  14 /**
  15  * Given object size, return id to use when allocating/freeing memory for object
  16  * 0 means error: can't store such a large object
  17  */
  18
  19 unsigned int slabs_clsid(const size_t size);
  20
  21 /** Allocate object of given length. 0 on error */ /*@null@*/
  22 void *slabs_alloc(const size_t size, unsigned int id);
  23
  24 /** Free previously allocated object */
  25 void slabs_free(void *ptr, size_t size, unsigned int id);
  26
  27 /** Adjust the stats for memory requested */
  28 void slabs_adjust_mem_requested(unsigned int id, size_t old, size_t ntotal);
  29
  30 /** Return a datum for stats in binary protocol */
  31 bool get_stats(const char *stat_type, int nkey, ADD_STAT add_stats, void *c);
  32
  33 /** Fill buffer with stats */ /*@null@*/
  34 void slabs_stats(ADD_STAT add_stats, void *c);
  35
  36 int start_slab_maintenance_thread(void);
  37 void stop_slab_maintenance_thread(void);
  38
  39 enum reassign_result_type {
  40     REASSIGN_OK=0, REASSIGN_RUNNING, REASSIGN_BADCLASS, REASSIGN_NOSPARE,
  41     REASSIGN_SRC_DST_SAME
  42 };
  43
  44 enum reassign_result_type slabs_reassign(int src, int dst);
  45
  46 #endif