path: root/erts/emulator/beam/erl_db.h

/*
 * %CopyrightBegin%
 * 
 * Copyright Ericsson AB 1996-2013. All Rights Reserved.
 * 
 * The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved online at http://www.erlang.org/.
 * 
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 * 
 * %CopyrightEnd%
 */

/*
 * This file now contains only the definitions needed for the
 * meta table.
 *
 */

#ifndef __DB_H__
#define __DB_H__

#include "sys.h"
#undef ERL_THR_PROGRESS_TSD_TYPE_ONLY
#define ERL_THR_PROGRESS_TSD_TYPE_ONLY
#include "erl_thr_progress.h"
#undef ERL_THR_PROGRESS_TSD_TYPE_ONLY
#include "bif.h"

#include "erl_db_util.h" /* Flags */
#include "erl_db_hash.h" /* DbTableHash */
#include "erl_db_tree.h" /* DbTableTree */
/*TT*/

Uint erts_get_ets_misc_mem_size(void);

typedef struct {
    DbTableCommon common;
    ErtsThrPrgrLaterOp data;
} DbTableRelease;

/*
 * So, the structure for a database table, NB this is only
 * interesting in db.c.
 */
union db_table {
    DbTableCommon common; /* Any type of db table */
    DbTableHash hash;     /* Linear hash array specific data */
    DbTableTree tree;     /* AVL tree specific data */
    DbTableRelease release;
    /*TT*/
};

#define DB_DEF_MAX_TABS 2053 /* Superseeded by environment variable 
				"ERL_MAX_ETS_TABLES" */
#define ERL_MAX_ETS_TABLES_ENV "ERL_MAX_ETS_TABLES"

typedef enum {
    ERTS_DB_SPNCNT_NONE,
    ERTS_DB_SPNCNT_VERY_LOW,
    ERTS_DB_SPNCNT_LOW,
    ERTS_DB_SPNCNT_NORMAL,
    ERTS_DB_SPNCNT_HIGH,
    ERTS_DB_SPNCNT_VERY_HIGH,
    ERTS_DB_SPNCNT_EXTREMELY_HIGH
} ErtsDbSpinCount;

void init_db(ErtsDbSpinCount);
int erts_db_process_exiting(Process *, ErtsProcLocks);
void db_info(int, void *, int);
void erts_db_foreach_table(void (*)(DbTable *, void *), void *);
void erts_db_foreach_offheap(DbTable *,
			     void (*func)(ErlOffHeap *, void *),
			     void *);

extern int erts_ets_rwmtx_spin_count;
extern int user_requested_db_max_tabs; /* set in erl_init */
extern int erts_ets_realloc_always_moves;  /* set in erl_init */
extern int erts_ets_always_compress;  /* set in erl_init */
extern Export ets_select_delete_continue_exp;
extern Export ets_select_count_continue_exp;
extern Export ets_select_continue_exp;
extern erts_smp_atomic_t erts_ets_misc_mem_size;

Eterm erts_ets_colliding_names(Process*, Eterm name, Uint cnt);

Uint erts_db_get_max_tabs(void);

#endif

#if defined(ERTS_WANT_DB_INTERNAL__) && !defined(ERTS_HAVE_DB_INTERNAL__)
#define ERTS_HAVE_DB_INTERNAL__

#include "erl_alloc.h"

/*
 * _fnf : Failure Not Fatal (same as for erts_alloc/erts_realloc/erts_free)
 * _nt  : No Table (i.e. memory not associated with a specific table)
 */

#define ERTS_DB_ALC_MEM_UPDATE_(TAB, FREE_SZ, ALLOC_SZ)			\
do {									\
    erts_aint_t sz__ = (((erts_aint_t) (ALLOC_SZ))			\
			- ((erts_aint_t) (FREE_SZ)));			\
    ASSERT((TAB));							\
    erts_smp_atomic_add_nob(&(TAB)->common.memory_size, sz__);		\
} while (0)

#define ERTS_ETS_MISC_MEM_ADD(SZ) \
  erts_smp_atomic_add_nob(&erts_ets_misc_mem_size, (SZ));

ERTS_GLB_INLINE void *erts_db_alloc(ErtsAlcType_t type,
				    DbTable *tab,
				    Uint size);
ERTS_GLB_INLINE void *erts_db_alloc_fnf(ErtsAlcType_t type,
					DbTable *tab,
					Uint size);
ERTS_GLB_INLINE void *erts_db_alloc_nt(ErtsAlcType_t type, Uint size);
ERTS_GLB_INLINE void *erts_db_alloc_fnf_nt(ErtsAlcType_t type, Uint size);

#if ERTS_GLB_INLINE_INCL_FUNC_DEF

ERTS_GLB_INLINE void *
erts_db_alloc(ErtsAlcType_t type, DbTable *tab, Uint size)
{
    void *res = erts_alloc(type, size);
    ERTS_DB_ALC_MEM_UPDATE_(tab, 0, size);
    return res;
}

ERTS_GLB_INLINE void *
erts_db_alloc_fnf(ErtsAlcType_t type, DbTable *tab, Uint size)
{
    void *res = erts_alloc_fnf(type, size);
    if (!res)
	return NULL;
    ERTS_DB_ALC_MEM_UPDATE_(tab, 0, size);
    return res;
}

ERTS_GLB_INLINE void *
erts_db_alloc_nt(ErtsAlcType_t type, Uint size)
{
    void *res = erts_alloc(type, size);
    return res;
}

ERTS_GLB_INLINE void *
erts_db_alloc_fnf_nt(ErtsAlcType_t type, Uint size)
{
    void *res = erts_alloc_fnf(type, size);
    if (!res)
	return NULL;
    return res;
}

#endif /* #if ERTS_GLB_INLINE_INCL_FUNC_DEF */

ERTS_GLB_INLINE void *erts_db_realloc(ErtsAlcType_t type,
				      DbTable *tab,
				      void *ptr,
				      Uint old_size,
				      Uint size);
ERTS_GLB_INLINE void *erts_db_realloc_fnf(ErtsAlcType_t type,
					  DbTable *tab,
					  void *ptr,
					  Uint old_size,
					  Uint size);
ERTS_GLB_INLINE void *erts_db_realloc_nt(ErtsAlcType_t type,
					 void *ptr,
					 Uint old_size,
					 Uint size);
ERTS_GLB_INLINE void *erts_db_realloc_fnf_nt(ErtsAlcType_t type,
					     void *ptr,
					     Uint old_size,
					     Uint size);

#if ERTS_GLB_INLINE_INCL_FUNC_DEF

ERTS_GLB_INLINE void *
erts_db_realloc(ErtsAlcType_t type, DbTable *tab, void *ptr,
		Uint old_size, Uint size)
{
    void *res;
    ASSERT(!ptr || old_size == ERTS_ALC_DBG_BLK_SZ(ptr));
    res = erts_realloc(type, ptr, size);
    ERTS_DB_ALC_MEM_UPDATE_(tab, old_size, size);
    return res;
}

ERTS_GLB_INLINE void *
erts_db_realloc_fnf(ErtsAlcType_t type, DbTable *tab, void *ptr,
		    Uint old_size, Uint size)
{
    void *res;
    ASSERT(!ptr || old_size == ERTS_ALC_DBG_BLK_SZ(ptr));
    res = erts_realloc_fnf(type, ptr, size);
    if (!res)
	return NULL;
    ERTS_DB_ALC_MEM_UPDATE_(tab, old_size, size);
    return res;
}

ERTS_GLB_INLINE void *
erts_db_realloc_nt(ErtsAlcType_t type, void *ptr,
		   Uint old_size, Uint size)
{
    void *res;
    ASSERT(!ptr || old_size == ERTS_ALC_DBG_BLK_SZ(ptr));
    res = erts_realloc(type, ptr, size);
    return res;
}

ERTS_GLB_INLINE void *
erts_db_realloc_fnf_nt(ErtsAlcType_t type, void *ptr,
		       Uint old_size, Uint size)
{
    void *res;
    ASSERT(!ptr || old_size == ERTS_ALC_DBG_BLK_SZ(ptr));
    res = erts_realloc_fnf(type, ptr, size);
    if (!res)
	return NULL;
    return res;
}

#endif /* #if ERTS_GLB_INLINE_INCL_FUNC_DEF */

ERTS_GLB_INLINE void erts_db_free(ErtsAlcType_t type,
				  DbTable *tab,
				  void *ptr,
				  Uint size);

ERTS_GLB_INLINE void erts_db_free_nt(ErtsAlcType_t type,
				     void *ptr,
				     Uint size);

#if ERTS_GLB_INLINE_INCL_FUNC_DEF

ERTS_GLB_INLINE void
erts_db_free(ErtsAlcType_t type, DbTable *tab, void *ptr, Uint size)
{
    ASSERT(ptr != 0);
    ASSERT(size == ERTS_ALC_DBG_BLK_SZ(ptr));
    ERTS_DB_ALC_MEM_UPDATE_(tab, size, 0);

    ASSERT(((void *) tab) != ptr
	   || erts_smp_atomic_read_nob(&tab->common.memory_size) == 0);

    erts_free(type, ptr);
}

ERTS_GLB_INLINE void
erts_db_free_nt(ErtsAlcType_t type, void *ptr, Uint size)
{
    ASSERT(ptr != 0);
    ASSERT(size == ERTS_ALC_DBG_BLK_SZ(ptr));

    erts_free(type, ptr);
}

#endif /* #if ERTS_GLB_INLINE_INCL_FUNC_DEF */

#undef ERTS_DB_ALC_MEM_UPDATE_

#endif /* #if defined(ERTS_WANT_DB_INTERNAL__) && !defined(ERTS_HAVE_DB_INTERNAL__) */