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

/*
 * %CopyrightBegin%
 * 
 * Copyright Ericsson AB 1996-2018. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * %CopyrightEnd%
 */

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

#ifndef ERTS_DB_SCHED_SPEC_TYPES__
#define ERTS_DB_SCHED_SPEC_TYPES__

union db_table;
typedef union db_table DbTable;

typedef struct ErtsEtsAllReq_ ErtsEtsAllReq;

typedef struct {
    ErtsEtsAllReq *next;
    ErtsEtsAllReq *prev;
} ErtsEtsAllReqList;

typedef struct {
    ErtsEtsAllReq *ongoing;
    ErlHeapFragment *hfrag;
    DbTable *tab;
    ErtsEtsAllReq *queue;
} ErtsEtsAllYieldData;

typedef struct {
    erts_atomic_t count;
    DbTable *clist;
} ErtsEtsTables;

#endif /* ERTS_DB_SCHED_SPEC_TYPES__ */

#ifndef ERTS_ONLY_SCHED_SPEC_ETS_DATA

#ifndef ERL_DB_H__
#define ERL_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 */
#include "erl_db_catree.h" /* DbTableCATree */
/*TT*/

Uint erts_get_ets_misc_mem_size(void);
Uint erts_ets_table_count(void);

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

struct ErtsSchedulerData_;
int erts_handle_yielded_ets_all_request(struct ErtsSchedulerData_ *esdp,
                                        ErtsEtsAllYieldData *eadp);

void erts_ets_sched_spec_data_init(struct ErtsSchedulerData_ *esdp);

/*
 * 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 */
    DbTableCATree catree;     /* CA tree specific data */
    DbTableRelease release;
    /*TT*/
};

#define DB_DEF_MAX_TABS 8192 /* 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 **);
int erts_db_execute_free_fixation(Process*, DbFixation*);
void db_info(fmtfn_t, 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_replace_continue_exp;
extern Export ets_select_continue_exp;
extern erts_atomic_t erts_ets_misc_mem_size;

Eterm erts_ets_colliding_names(Process*, Eterm name, Uint cnt);
int erts_ets_force_split(Eterm tid, int on);
Uint erts_db_get_max_tabs(void);
Eterm erts_db_make_tid(Process *c_p, DbTableCommon *tb);

#ifdef ERTS_ENABLE_LOCK_COUNT
void erts_lcnt_enable_db_lock_count(DbTable *tb, int enable);
void erts_lcnt_update_db_locks(int enable);
#endif

#ifdef ETS_DBG_FORCE_TRAP
extern erts_aint_t erts_ets_dbg_force_trap;
#endif

#endif /* ERL_DB_H__ */

#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_atomic_add_nob(&(TAB)->common.memory_size, sz__);		\
} while (0)

#define ERTS_ETS_MISC_MEM_ADD(SZ) \
  erts_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_schedule_db_free(DbTableCommon* tab,
                                           void (*free_func)(void *),
                                           void *ptr,
                                           ErtsThrPrgrLaterOp *lop,
                                           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_atomic_read_nob(&tab->common.memory_size) == 0);

    erts_free(type, ptr);
}

ERTS_GLB_INLINE void
erts_schedule_db_free(DbTableCommon* tab,
                      void (*free_func)(void *),
                      void *ptr,
                      ErtsThrPrgrLaterOp *lop,
                      Uint size)
{
    ASSERT(ptr != 0);
    ASSERT(((void *) tab) != ptr);
    ASSERT(size == ERTS_ALC_DBG_BLK_SZ(ptr));

    /*
     * We update table memory stats here as table may already be gone
     * when 'free_func' is finally called.
     */
    ERTS_DB_ALC_MEM_UPDATE_((DbTable*)tab, size, 0);

    erts_schedule_thr_prgr_later_cleanup_op(free_func, ptr, lop, size);
}

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 */

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

#endif /* !ERTS_ONLY_SCHED_SPEC_ETS_DATA */