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/*
* BIRD Resource Manager
*
* (c) 1998--1999 Martin Mares <mj@ucw.cz>
* (c) 2021 Maria Matejka <mq@jmq.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_RESOURCE_H_
#define _BIRD_RESOURCE_H_
#include "lib/lists.h"
struct resmem {
size_t effective; /* Memory actually used for data storage */
size_t overhead; /* Overhead memory imposed by allocator strategies */
};
/* Resource */
typedef struct resource {
node n; /* Inside resource pool */
struct resclass *class; /* Resource class */
} resource;
/* Resource class */
struct resclass {
char *name; /* Resource class name */
unsigned size; /* Standard size of single resource */
void (*free)(resource *); /* Freeing function */
void (*dump)(resource *); /* Dump to debug output */
resource *(*lookup)(resource *, unsigned long); /* Look up address (only for debugging) */
struct resmem (*memsize)(resource *); /* Return size of memory used by the resource, may be NULL */
};
/* Estimate of system allocator overhead per item, for memory consumtion stats */
#define ALLOC_OVERHEAD 16
/* Generic resource manipulation */
typedef struct pool {
resource r;
list inside;
const char *name;
} pool;
void resource_init(void);
pool *rp_new(pool *, const char *); /* Create new pool */
pool *rp_newf(pool *, const char *, ...); /* Create a new pool with a formatted string as its name */
void rfree(void *); /* Free single resource */
void rdump(void *); /* Dump to debug output */
struct resmem rmemsize(void *res); /* Return size of memory used by the resource */
void rlookup(unsigned long); /* Look up address (only for debugging) */
void rmove(void *, pool *); /* Move to a different pool */
void *ralloc(pool *, struct resclass *);
extern pool root_pool;
/* Normal memory blocks */
void *mb_alloc(pool *, unsigned size);
void *mb_allocz(pool *, unsigned size);
void *mb_realloc(void *m, unsigned size);
void mb_free(void *);
/* Memory pools with linear allocation */
typedef struct linpool linpool;
typedef struct lp_state {
void *current, *large;
byte *ptr;
uint total_large;
} lp_state;
linpool *lp_new(pool *);
void *lp_alloc(linpool *, unsigned size); /* Aligned */
void *lp_allocu(linpool *, unsigned size); /* Unaligned */
void *lp_allocz(linpool *, unsigned size); /* With clear */
void lp_flush(linpool *); /* Free everything, but leave linpool */
void lp_save(linpool *m, lp_state *p); /* Save state */
void lp_restore(linpool *m, lp_state *p); /* Restore state */
struct tmp_resources {
pool *pool, *parent;
linpool *lp;
};
extern _Thread_local struct tmp_resources tmp_res;
#define tmp_linpool tmp_res.lp
#define tmp_alloc(sz) lp_alloc(tmp_linpool, sz)
#define tmp_allocu(sz) lp_allocu(tmp_linpool, sz)
#define tmp_allocz(sz) lp_allocz(tmp_linpool, sz)
void tmp_init(pool *p);
void tmp_flush(void);
#define lp_new_default lp_new
/* Slabs */
typedef struct slab slab;
slab *sl_new(pool *, unsigned size);
void *sl_alloc(slab *);
void *sl_allocz(slab *);
void sl_free(void *);
/*
* Low-level memory allocation functions, please don't use
* outside resource manager and possibly sysdep code.
*/
void buffer_realloc(void **buf, unsigned *size, unsigned need, unsigned item_size);
/* Allocator of whole pages; for use in slabs and other high-level allocators. */
#define PAGE_HEAD(x) ((void *) (((uintptr_t) (x)) & ~(page_size-1)))
extern long page_size;
extern _Atomic int pages_kept;
extern _Atomic int pages_kept_locally;
void *alloc_page(void);
void free_page(void *);
void flush_local_pages(void);
void resource_sys_init(void);
#ifdef HAVE_LIBDMALLOC
/*
* The standard dmalloc macros tend to produce lots of namespace
* conflicts and we use only xmalloc, xrealloc and xfree, so we
* can define the stubs ourselves.
*/
#define DMALLOC_DISABLE
#include <dmalloc.h>
#define xmalloc(size) \
dmalloc_malloc(__FILE__, __LINE__, (size), DMALLOC_FUNC_MALLOC, 0, 1)
#define xrealloc(ptr, size) \
dmalloc_realloc(__FILE__, __LINE__, (ptr), (size), DMALLOC_FUNC_REALLOC, 1)
#define xfree(ptr) \
dmalloc_free(__FILE__, __LINE__, (ptr), DMALLOC_FUNC_FREE)
#else
/*
* Unfortunately, several libraries we might want to link to define
* their own xmalloc and we don't want to interfere with them, hence
* the renaming.
*/
#define xmalloc bird_xmalloc
#define xrealloc bird_xrealloc
void *xmalloc(unsigned);
void *xrealloc(void *, unsigned);
#define xfree(x) free(x)
#endif
#endif
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