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/*
* Primitive slab allocator.
*
* Copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/**
* @file
*
* Slab allocator for same-size objects.
*
* Basic behaviour:
* - On each alloc initializer is called.
* - if init func is not given, memset() is done
* - init func gets either zeroed obj or old obj from _free().
* 'struct List' on obj start is non-zero.
*
* ATM custom 'align' larger than malloc() alignment does not work.
*/
#ifndef _USUAL_SLAB_H_
#define _USUAL_SLAB_H_
#include <usual/cxalloc.h>
/** Reference to main */
struct Slab;
/** Signature for object init function */
typedef void (*slab_init_fn)(void *obj);
/** Create new slab context for specific size */
struct Slab *slab_create(const char *name, unsigned obj_size, unsigned align,
slab_init_fn init_func,
CxMem *cx);
/** Free whole context */
void slab_destroy(struct Slab *slab);
/** Allocate single object from slab cache */
void *slab_alloc(struct Slab *slab) _MALLOC _MUSTCHECK;
/** Release single object back */
void slab_free(struct Slab *slab, void *obj);
/** Return sum of free and used objects */
int slab_total_count(const struct Slab *slab);
/** Return number of free objects in cache */
int slab_free_count(const struct Slab *slab);
/** Return number of used objects */
int slab_active_count(const struct Slab *slab);
/** Signature for stat info callback */
typedef void (*slab_stat_fn)(void *arg, const char *slab_name,
unsigned size, unsigned free,
unsigned total);
/** Run stat info callback on all slabs */
void slab_stats(slab_stat_fn cb_func, void *cb_arg);
#endif
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