slabs.h

/* slabs memory allocation */
#ifndef SLABS_H
#define SLABS_H

#include "default_engine.h"



/* powers-of-N allocation structures */

typedef struct {
    unsigned int size;      /* sizes of items */
    unsigned int perslab;   /* how many items per slab */

    void **slots;           /* list of item ptrs */
    unsigned int sl_total;  /* size of previous array */
    unsigned int sl_curr;   /* first free slot */

    void *end_page_ptr;         /* pointer to next free item at end of page, or 0 */
    unsigned int end_page_free; /* number of items remaining at end of last alloced page */

    unsigned int slabs;     /* how many slabs were allocated for this class */

    void **slab_list;       /* array of slab pointers */
    unsigned int list_size; /* size of prev array */

    unsigned int killing;  /* index+1 of dying slab, or zero if none */
    size_t requested; /* The number of requested bytes */
} slabclass_t;

struct slabs {
   slabclass_t slabclass[MAX_NUMBER_OF_SLAB_CLASSES];
   size_t mem_limit;
   size_t mem_malloced;
   int power_largest;

   void *mem_base;
   void *mem_current;
   size_t mem_avail;

   pthread_mutex_t lock;
};




ENGINE_ERROR_CODE slabs_init(struct default_engine *engine,
                             const size_t limit,
                             const double factor,
                             const bool prealloc);


unsigned int slabs_clsid(struct default_engine *engine, const size_t size);
 /*@null@*/
void *slabs_alloc(struct default_engine *engine, const size_t size, unsigned int id);

void slabs_free(struct default_engine *engine, void *ptr, size_t size, unsigned int id);
 /*@null@*/
void slabs_stats(struct default_engine *engine, ADD_STAT add_stats, const void *c);

void add_statistics(const void *cookie, ADD_STAT add_stats,
                    const char *prefix, int num, const char *key,
                    const char *fmt, ...);

#endif