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erl_db.c
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erl_db.c
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/*
* %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 contains the 'ets' bif interface functions.
*/
/*
#ifdef DEBUG
#define HARDDEBUG 1
#endif
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#define ERTS_WANT_DB_INTERNAL__
#include "erl_db.h"
#include "bif.h"
#include "big.h"
#include "erl_binary.h"
#include "bif.h"
erts_atomic_t erts_ets_misc_mem_size;
/*
** Utility macros
*/
#define DB_BIF_GET_TABLE(TB, WHAT, KIND, BIF_IX) \
DB_GET_TABLE(TB, BIF_ARG_1, WHAT, KIND, BIF_IX, NULL, BIF_P)
#define DB_TRAP_GET_TABLE(TB, TID, WHAT, KIND, BIF_EXP) \
DB_GET_TABLE(TB, TID, WHAT, KIND, 0, BIF_EXP, BIF_P)
#define DB_GET_TABLE(TB, TID, WHAT, KIND, BIF_IX, BIF_EXP, PROC) \
do { \
Uint freason__; \
if (!(TB = db_get_table(PROC, TID, WHAT, KIND, &freason__))) { \
return db_bif_fail(PROC, freason__, BIF_IX, BIF_EXP); \
} \
}while(0)
#define DB_GET_APPROX_NITEMS(DB) \
erts_flxctr_read_approx(&(DB)->common.counters, ERTS_DB_TABLE_NITEMS_COUNTER_ID)
#define DB_GET_APPROX_MEM_CONSUMED(DB) \
erts_flxctr_read_approx(&(DB)->common.counters, ERTS_DB_TABLE_MEM_COUNTER_ID)
static BIF_RETTYPE db_bif_fail(Process* p, Uint freason,
Uint bif_ix, Export* bif_exp)
{
if (freason == TRAP) {
if (!bif_exp)
bif_exp = bif_export[bif_ix];
p->arity = bif_exp->info.mfa.arity;
p->i = (BeamInstr*) bif_exp->addressv[erts_active_code_ix()];
}
p->freason = freason;
return THE_NON_VALUE;
}
/* Get a key from any table structure and a tagged object */
#define TERM_GETKEY(tb, obj) db_getkey((tb)->common.keypos, (obj))
# define ITERATION_SAFETY(Proc,Tab) \
((IS_TREE_TABLE((Tab)->common.status) || IS_CATREE_TABLE((Tab)->common.status) \
|| ONLY_WRITER(Proc,Tab)) ? ITER_SAFE \
: (((Tab)->common.status & DB_FINE_LOCKED) ? ITER_UNSAFE : ITER_SAFE_LOCKED))
#define DID_TRAP(P,Ret) (!is_value(Ret) && ((P)->freason == TRAP))
/*
* "fixed_tabs": list of all fixed tables for a process
*/
#ifdef DEBUG
static int fixed_tabs_find(DbFixation* first, DbFixation* fix);
#endif
static void fixed_tabs_insert(Process* p, DbFixation* fix)
{
DbFixation* first = erts_psd_get(p, ERTS_PSD_ETS_FIXED_TABLES);
if (!first) {
fix->tabs.next = fix->tabs.prev = fix;
erts_psd_set(p, ERTS_PSD_ETS_FIXED_TABLES, fix);
}
else {
ASSERT(!fixed_tabs_find(first, fix));
fix->tabs.prev = first->tabs.prev;
fix->tabs.next = first;
fix->tabs.prev->tabs.next = fix;
first->tabs.prev = fix;
}
}
static void fixed_tabs_delete(Process *p, DbFixation* fix)
{
if (fix->tabs.next == fix) {
DbFixation* old;
ASSERT(fix->tabs.prev == fix);
old = erts_psd_set(p, ERTS_PSD_ETS_FIXED_TABLES, NULL);
ASSERT(old == fix); (void)old;
}
else {
DbFixation *first = (DbFixation*) erts_psd_get(p, ERTS_PSD_ETS_FIXED_TABLES);
ASSERT(fixed_tabs_find(first, fix));
fix->tabs.prev->tabs.next = fix->tabs.next;
fix->tabs.next->tabs.prev = fix->tabs.prev;
if (fix == first)
erts_psd_set(p, ERTS_PSD_ETS_FIXED_TABLES, fix->tabs.next);
}
}
#ifdef DEBUG
static int fixed_tabs_find(DbFixation* first, DbFixation* fix)
{
DbFixation* p;
if (!first) {
first = (DbFixation*) erts_psd_get(fix->procs.p, ERTS_PSD_ETS_FIXED_TABLES);
}
p = first;
do {
if (p == fix)
return 1;
ASSERT(p->procs.p == fix->procs.p);
ASSERT(p->tabs.next->tabs.prev == p);
p = p->tabs.next;
} while (p != first);
return 0;
}
#endif
/*
* fixing_procs: tree of all processes fixating a table
*/
#define ERTS_RBT_PREFIX fixing_procs
#define ERTS_RBT_T DbFixation
#define ERTS_RBT_KEY_T Process*
#define ERTS_RBT_FLAGS_T int
#define ERTS_RBT_INIT_EMPTY_TNODE(T) \
do { \
(T)->procs.parent = NULL; \
(T)->procs.right = NULL; \
(T)->procs.left = NULL; \
} while (0)
#define ERTS_RBT_IS_RED(T) ((T)->procs.is_red)
#define ERTS_RBT_SET_RED(T) ((T)->procs.is_red = 1)
#define ERTS_RBT_IS_BLACK(T) (!(T)->procs.is_red)
#define ERTS_RBT_SET_BLACK(T) ((T)->procs.is_red = 0)
#define ERTS_RBT_GET_FLAGS(T) ((T)->procs.is_red)
#define ERTS_RBT_SET_FLAGS(T, F) ((T)->procs.is_red = (F))
#define ERTS_RBT_GET_PARENT(T) ((T)->procs.parent)
#define ERTS_RBT_SET_PARENT(T, P) ((T)->procs.parent = (P))
#define ERTS_RBT_GET_RIGHT(T) ((T)->procs.right)
#define ERTS_RBT_SET_RIGHT(T, R) ((T)->procs.right = (R))
#define ERTS_RBT_GET_LEFT(T) ((T)->procs.left)
#define ERTS_RBT_SET_LEFT(T, L) ((T)->procs.left = (L))
#define ERTS_RBT_GET_KEY(T) ((T)->procs.p)
#define ERTS_RBT_IS_LT(KX, KY) ((KX) < (KY))
#define ERTS_RBT_IS_EQ(KX, KY) ((KX) == (KY))
#define ERTS_RBT_WANT_INSERT
#define ERTS_RBT_WANT_LOOKUP
#define ERTS_RBT_WANT_DELETE
#define ERTS_RBT_WANT_FOREACH
#define ERTS_RBT_WANT_FOREACH_DESTROY
#define ERTS_RBT_UNDEF
#include "erl_rbtree.h"
#ifdef HARDDEBUG
# error Do something useful with CHECK_TABLES maybe
#else
# define CHECK_TABLES()
#endif
static void
send_ets_transfer_message(Process *c_p, Process *proc,
ErtsProcLocks *locks,
DbTable *tb, Eterm heir_data);
static void schedule_free_dbtable(DbTable* tb);
static void delete_sched_table(Process *c_p, DbTable *tb);
static void table_dec_refc(DbTable *tb, erts_aint_t min_val)
{
if (erts_refc_dectest(&tb->common.refc, min_val) == 0)
schedule_free_dbtable(tb);
}
static int
db_table_tid_destructor(Binary *unused)
{
return 1;
}
static ERTS_INLINE void
make_btid(DbTable *tb)
{
Binary *btid = erts_create_magic_indirection(db_table_tid_destructor);
erts_atomic_t *tbref = erts_binary_to_magic_indirection(btid);
erts_atomic_init_nob(tbref, (erts_aint_t) tb);
tb->common.btid = btid;
/*
* Table and magic indirection refer eachother,
* and table is refered once by being alive...
*/
erts_refc_init(&tb->common.refc, 2);
erts_refc_inc(&btid->intern.refc, 1);
}
static ERTS_INLINE DbTable* btid2tab(Binary* btid)
{
erts_atomic_t *tbref = erts_binary_to_magic_indirection(btid);
return (DbTable *) erts_atomic_read_nob(tbref);
}
static DbTable *
tid2tab(Eterm tid)
{
DbTable *tb;
Binary *btid;
erts_atomic_t *tbref;
if (!is_internal_magic_ref(tid))
return NULL;
btid = erts_magic_ref2bin(tid);
if (ERTS_MAGIC_BIN_DESTRUCTOR(btid) != db_table_tid_destructor)
return NULL;
tbref = erts_binary_to_magic_indirection(btid);
tb = (DbTable *) erts_atomic_read_nob(tbref);
ASSERT(!tb || tb->common.btid == btid);
return tb;
}
static ERTS_INLINE int
is_table_alive(DbTable *tb)
{
erts_atomic_t *tbref;
DbTable *rtb;
tbref = erts_binary_to_magic_indirection(tb->common.btid);
rtb = (DbTable *) erts_atomic_read_nob(tbref);
ASSERT(!rtb || rtb == tb);
return !!rtb;
}
static ERTS_INLINE int
is_table_named(DbTable *tb)
{
return tb->common.type & DB_NAMED_TABLE;
}
static ERTS_INLINE void
tid_clear(Process *c_p, DbTable *tb)
{
DbTable *rtb;
Binary *btid = tb->common.btid;
erts_atomic_t *tbref = erts_binary_to_magic_indirection(btid);
rtb = (DbTable *) erts_atomic_xchg_nob(tbref, (erts_aint_t) NULL);
ASSERT(!rtb || tb == rtb);
if (rtb) {
table_dec_refc(tb, 1);
delete_sched_table(c_p, tb);
}
}
static ERTS_INLINE Eterm
make_tid(Process *c_p, DbTable *tb)
{
Eterm *hp = HAlloc(c_p, ERTS_MAGIC_REF_THING_SIZE);
return erts_mk_magic_ref(&hp, &c_p->off_heap, tb->common.btid);
}
Eterm
erts_db_make_tid(Process *c_p, DbTableCommon *tb)
{
return make_tid(c_p, (DbTable*)tb);
}
/*
** The meta hash table of all NAMED ets tables
*/
# define META_NAME_TAB_LOCK_CNT 256
union {
erts_rwmtx_t lck;
byte align[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(erts_rwmtx_t))];
}meta_name_tab_rwlocks[META_NAME_TAB_LOCK_CNT];
static struct meta_name_tab_entry {
union {
Eterm name_atom;
Eterm mcnt; /* Length of mvec in multiple tab entry */
}u;
union {
DbTable *tb;
struct meta_name_tab_entry* mvec;
}pu;
} *meta_name_tab;
static unsigned meta_name_tab_mask;
static ERTS_INLINE
struct meta_name_tab_entry* meta_name_tab_bucket(Eterm name,
erts_rwmtx_t** lockp)
{
unsigned bix = atom_val(name) & meta_name_tab_mask;
struct meta_name_tab_entry* bucket = &meta_name_tab[bix];
/* Only non-dirty schedulers are allowed to access the metatable
The smp 1 optimizations for ETS depend on that */
ASSERT(erts_get_scheduler_data() && !ERTS_SCHEDULER_IS_DIRTY(erts_get_scheduler_data()));
*lockp = &meta_name_tab_rwlocks[bix % META_NAME_TAB_LOCK_CNT].lck;
return bucket;
}
typedef enum {
LCK_READ=1, /* read only access */
LCK_WRITE=2, /* exclusive table write access */
LCK_WRITE_REC=3 /* record write access */
} db_lock_kind_t;
extern DbTableMethod db_hash;
extern DbTableMethod db_tree;
extern DbTableMethod db_catree;
int user_requested_db_max_tabs;
int erts_ets_realloc_always_moves;
int erts_ets_always_compress;
static int db_max_tabs;
/*
** Forward decls, static functions
*/
static void fix_table_locked(Process* p, DbTable* tb);
static void unfix_table_locked(Process* p, DbTable* tb, db_lock_kind_t* kind);
static void set_heir(Process* me, DbTable* tb, Eterm heir, UWord heir_data);
static void free_heir_data(DbTable*);
static SWord free_fixations_locked(Process* p, DbTable *tb);
static void delete_all_objects_continue(Process* p, DbTable* tb);
static SWord free_table_continue(Process *p, DbTable *tb, SWord reds);
static void print_table(fmtfn_t to, void *to_arg, int show, DbTable* tb);
static BIF_RETTYPE ets_select_delete_trap_1(BIF_ALIST_1);
static BIF_RETTYPE ets_select_count_1(BIF_ALIST_1);
static BIF_RETTYPE ets_select_replace_1(BIF_ALIST_1);
static BIF_RETTYPE ets_select_trap_1(BIF_ALIST_1);
static BIF_RETTYPE ets_delete_trap(BIF_ALIST_1);
static Eterm table_info(Process* p, DbTable* tb, Eterm What);
static BIF_RETTYPE ets_select1(Process* p, int bif_ix, Eterm arg1);
static BIF_RETTYPE ets_select2(Process* p, DbTable*, Eterm tid, Eterm ms);
static BIF_RETTYPE ets_select3(Process* p, DbTable*, Eterm tid, Eterm ms, Sint chunk_size);
/*
* Exported global
*/
Export ets_select_delete_continue_exp;
Export ets_select_count_continue_exp;
Export ets_select_replace_continue_exp;
Export ets_select_continue_exp;
/*
* Static traps
*/
static Export ets_delete_continue_exp;
static Export *ets_info_binary_trap = NULL;
static void
free_dbtable(void *vtb)
{
DbTable *tb = (DbTable *) vtb;
ASSERT(erts_flxctr_is_snapshot_ongoing(&tb->common.counters) ||
sizeof(DbTable) == erts_flxctr_read_approx(&tb->common.counters,
ERTS_DB_TABLE_MEM_COUNTER_ID));
ASSERT(is_immed(tb->common.heir_data));
if (!DB_LOCK_FREE(tb)) {
erts_rwmtx_destroy(&tb->common.rwlock);
erts_mtx_destroy(&tb->common.fixlock);
}
if (tb->common.btid)
erts_bin_release(tb->common.btid);
erts_flxctr_destroy(&tb->common.counters, ERTS_ALC_T_DB_TABLE);
erts_free(ERTS_ALC_T_DB_TABLE, tb);
}
static void schedule_free_dbtable(DbTable* tb)
{
/*
* NON-SMP case: Caller is *not* allowed to access the *tb
* structure after this function has returned!
* SMP case: Caller is allowed to access the *common* part of the *tb
* structure until the bif has returned (we typically need to
* unlock the table lock after this function has returned).
* Caller is *not* allowed to access the specialized part
* (hash or tree) of *tb after this function has returned.
*/
ASSERT(erts_refc_read(&tb->common.refc, 0) == 0);
ASSERT(erts_refc_read(&tb->common.fix_count, 0) == 0);
erts_schedule_thr_prgr_later_cleanup_op(free_dbtable,
(void *) tb,
&tb->release.data,
sizeof(DbTable));
}
static ERTS_INLINE void
save_sched_table(Process *c_p, DbTable *tb)
{
ErtsSchedulerData *esdp = erts_proc_sched_data(c_p);
DbTable *first;
ASSERT(esdp);
erts_atomic_inc_nob(&esdp->ets_tables.count);
erts_refc_inc(&tb->common.refc, 1);
first = esdp->ets_tables.clist;
if (!first) {
tb->common.all.next = tb->common.all.prev = tb;
esdp->ets_tables.clist = tb;
}
else {
tb->common.all.prev = first->common.all.prev;
tb->common.all.next = first;
tb->common.all.prev->common.all.next = tb;
first->common.all.prev = tb;
}
}
static ERTS_INLINE void
remove_sched_table(ErtsSchedulerData *esdp, DbTable *tb)
{
ErtsEtsAllYieldData *eaydp;
ASSERT(esdp);
ASSERT(erts_get_ref_numbers_thr_id(ERTS_MAGIC_BIN_REFN(tb->common.btid))
== (Uint32) esdp->no);
ASSERT(erts_atomic_read_nob(&esdp->ets_tables.count) > 0);
erts_atomic_dec_nob(&esdp->ets_tables.count);
eaydp = ERTS_SCHED_AUX_YIELD_DATA(esdp, ets_all);
if (eaydp->ongoing) {
/* ets:all() op process list from last to first... */
if (eaydp->tab == tb) {
if (eaydp->tab == esdp->ets_tables.clist)
eaydp->tab = NULL;
else
eaydp->tab = tb->common.all.prev;
}
}
if (tb->common.all.next == tb) {
ASSERT(tb->common.all.prev == tb);
ASSERT(esdp->ets_tables.clist == tb);
esdp->ets_tables.clist = NULL;
}
else {
#ifdef DEBUG
DbTable *tmp = esdp->ets_tables.clist;
do {
if (tmp == tb) break;
tmp = tmp->common.all.next;
} while (tmp != esdp->ets_tables.clist);
ASSERT(tmp == tb);
#endif
tb->common.all.prev->common.all.next = tb->common.all.next;
tb->common.all.next->common.all.prev = tb->common.all.prev;
if (esdp->ets_tables.clist == tb)
esdp->ets_tables.clist = tb->common.all.next;
}
table_dec_refc(tb, 0);
}
static void
scheduled_remove_sched_table(void *vtb)
{
remove_sched_table(erts_get_scheduler_data(), (DbTable *) vtb);
}
static void
delete_sched_table(Process *c_p, DbTable *tb)
{
ErtsSchedulerData *esdp = erts_proc_sched_data(c_p);
Uint32 sid;
ASSERT(esdp);
ASSERT(tb->common.btid);
sid = erts_get_ref_numbers_thr_id(ERTS_MAGIC_BIN_REFN(tb->common.btid));
ASSERT(1 <= sid && sid <= erts_no_schedulers);
if (sid == (Uint32) esdp->no)
remove_sched_table(esdp, tb);
else
erts_schedule_misc_aux_work((int) sid, scheduled_remove_sched_table, tb);
}
static ERTS_INLINE void
save_owned_table(Process *c_p, DbTable *tb)
{
DbTable *first;
erts_proc_lock(c_p, ERTS_PROC_LOCK_STATUS);
first = (DbTable*) erts_psd_get(c_p, ERTS_PSD_ETS_OWNED_TABLES);
erts_refc_inc(&tb->common.refc, 1);
if (!first) {
tb->common.owned.next = tb->common.owned.prev = tb;
erts_psd_set(c_p, ERTS_PSD_ETS_OWNED_TABLES, tb);
}
else {
tb->common.owned.prev = first->common.owned.prev;
tb->common.owned.next = first;
tb->common.owned.prev->common.owned.next = tb;
first->common.owned.prev = tb;
}
erts_proc_unlock(c_p, ERTS_PROC_LOCK_STATUS);
}
static ERTS_INLINE void
delete_owned_table(Process *p, DbTable *tb)
{
erts_proc_lock(p, ERTS_PROC_LOCK_STATUS);
if (tb->common.owned.next == tb) {
DbTable* old;
ASSERT(tb->common.owned.prev == tb);
old = erts_psd_set(p, ERTS_PSD_ETS_OWNED_TABLES, NULL);
ASSERT(old == tb); (void)old;
}
else {
DbTable *first = (DbTable*) erts_psd_get(p, ERTS_PSD_ETS_OWNED_TABLES);
#ifdef DEBUG
DbTable *tmp = first;
do {
if (tmp == tb) break;
tmp = tmp->common.owned.next;
} while (tmp != first);
ASSERT(tmp == tb);
#endif
tb->common.owned.prev->common.owned.next = tb->common.owned.next;
tb->common.owned.next->common.owned.prev = tb->common.owned.prev;
if (tb == first)
erts_psd_set(p, ERTS_PSD_ETS_OWNED_TABLES, tb->common.owned.next);
}
erts_proc_unlock(p, ERTS_PROC_LOCK_STATUS);
table_dec_refc(tb, 1);
}
static ERTS_INLINE void db_init_lock(DbTable* tb, int use_frequent_read_lock)
{
erts_rwmtx_opt_t rwmtx_opt = ERTS_RWMTX_OPT_DEFAULT_INITER;
if (use_frequent_read_lock)
rwmtx_opt.type = ERTS_RWMTX_TYPE_FREQUENT_READ;
if (erts_ets_rwmtx_spin_count >= 0)
rwmtx_opt.main_spincount = erts_ets_rwmtx_spin_count;
if (!DB_LOCK_FREE(tb)) {
erts_rwmtx_init_opt(&tb->common.rwlock, &rwmtx_opt, "db_tab",
tb->common.the_name, ERTS_LOCK_FLAGS_CATEGORY_DB);
erts_mtx_init(&tb->common.fixlock, "db_tab_fix",
tb->common.the_name, ERTS_LOCK_FLAGS_CATEGORY_DB);
}
tb->common.is_thread_safe = !(tb->common.status & DB_FINE_LOCKED);
ASSERT(!DB_LOCK_FREE(tb) || tb->common.is_thread_safe);
}
static ERTS_INLINE void db_lock(DbTable* tb, db_lock_kind_t kind)
{
if (DB_LOCK_FREE(tb))
return;
if (tb->common.type & DB_FINE_LOCKED) {
if (kind == LCK_WRITE) {
erts_rwmtx_rwlock(&tb->common.rwlock);
tb->common.is_thread_safe = 1;
} else {
erts_rwmtx_rlock(&tb->common.rwlock);
ASSERT(!tb->common.is_thread_safe);
}
}
else
{
switch (kind) {
case LCK_WRITE:
case LCK_WRITE_REC:
erts_rwmtx_rwlock(&tb->common.rwlock);
break;
default:
erts_rwmtx_rlock(&tb->common.rwlock);
}
ASSERT(tb->common.is_thread_safe);
}
}
static ERTS_INLINE void db_unlock(DbTable* tb, db_lock_kind_t kind)
{
if (DB_LOCK_FREE(tb))
return;
if (tb->common.type & DB_FINE_LOCKED) {
if (kind == LCK_WRITE) {
ASSERT(tb->common.is_thread_safe);
tb->common.is_thread_safe = 0;
erts_rwmtx_rwunlock(&tb->common.rwlock);
}
else {
ASSERT(!tb->common.is_thread_safe);
erts_rwmtx_runlock(&tb->common.rwlock);
}
}
else {
ASSERT(tb->common.is_thread_safe);
switch (kind) {
case LCK_WRITE:
case LCK_WRITE_REC:
erts_rwmtx_rwunlock(&tb->common.rwlock);
break;
default:
erts_rwmtx_runlock(&tb->common.rwlock);
}
}
}
static ERTS_INLINE int db_is_exclusive(DbTable* tb, db_lock_kind_t kind)
{
if (DB_LOCK_FREE(tb))
return 1;
return kind != LCK_READ && tb->common.is_thread_safe;
}
static DbTable* handle_lacking_permission(Process* p, DbTable* tb,
db_lock_kind_t kind,
Uint* freason_p)
{
if (tb->common.status & DB_BUSY) {
if (!db_is_exclusive(tb, kind)) {
db_unlock(tb, kind);
db_lock(tb, LCK_WRITE);
}
delete_all_objects_continue(p, tb);
db_unlock(tb, LCK_WRITE);
tb = NULL;
*freason_p = TRAP;
}
else if (p->common.id != tb->common.owner
&& !(p->flags & F_ETS_SUPER_USER)) {
db_unlock(tb, kind);
tb = NULL;
*freason_p = BADARG;
}
return tb;
}
static ERTS_INLINE
DbTable* db_get_table_aux(Process *p,
Eterm id,
int what,
db_lock_kind_t kind,
int meta_already_locked,
Uint* freason_p)
{
DbTable *tb;
/*
* IMPORTANT: Only non-dirty scheduler threads are allowed
* to access tables. Memory management depend on it.
*/
ASSERT(erts_get_scheduler_data() && !ERTS_SCHEDULER_IS_DIRTY(erts_get_scheduler_data()));
if (META_DB_LOCK_FREE())
meta_already_locked = 1;
if (is_atom(id)) {
erts_rwmtx_t *mtl;
struct meta_name_tab_entry* bucket = meta_name_tab_bucket(id,&mtl);
if (!meta_already_locked)
erts_rwmtx_rlock(mtl);
else {
ERTS_LC_ASSERT(erts_lc_rwmtx_is_rlocked(mtl)
|| erts_lc_rwmtx_is_rwlocked(mtl)
|| META_DB_LOCK_FREE());
}
tb = NULL;
if (bucket->pu.tb != NULL) {
if (is_atom(bucket->u.name_atom)) { /* single */
if (bucket->u.name_atom == id)
tb = bucket->pu.tb;
}
else { /* multi */
Uint cnt = unsigned_val(bucket->u.mcnt);
Uint i;
for (i=0; i<cnt; i++) {
if (bucket->pu.mvec[i].u.name_atom == id) {
tb = bucket->pu.mvec[i].pu.tb;
break;
}
}
}
}
if (!meta_already_locked)
erts_rwmtx_runlock(mtl);
}
else
tb = tid2tab(id);
if (tb) {
db_lock(tb, kind);
#ifdef ETS_DBG_FORCE_TRAP
if (erts_atomic_read_nob(&tb->common.dbg_force_trap) &&
erts_atomic_add_read_nob(&tb->common.dbg_force_trap, 2) & 2) {
db_unlock(tb, kind);
tb = NULL;
*freason_p = TRAP;
}
else
#endif
if (ERTS_UNLIKELY(!(tb->common.status & what)))
tb = handle_lacking_permission(p, tb, kind, freason_p);
}
else
*freason_p = BADARG;
return tb;
}
static ERTS_INLINE
DbTable* db_get_table(Process *p,
Eterm id,
int what,
db_lock_kind_t kind,
Uint* freason_p)
{
return db_get_table_aux(p, id, what, kind, 0, freason_p);
}
static int insert_named_tab(Eterm name_atom, DbTable* tb, int have_lock)
{
int ret = 0;
erts_rwmtx_t* rwlock;
struct meta_name_tab_entry* new_entry;
struct meta_name_tab_entry* bucket = meta_name_tab_bucket(name_atom,
&rwlock);
if (META_DB_LOCK_FREE())
have_lock = 1;
if (!have_lock)
erts_rwmtx_rwlock(rwlock);
if (bucket->pu.tb == NULL) { /* empty */
new_entry = bucket;
}
else {
struct meta_name_tab_entry* entries;
Uint cnt;
if (is_atom(bucket->u.name_atom)) { /* single */
size_t size;
if (bucket->u.name_atom == name_atom) {
goto done;
}
cnt = 2;
size = sizeof(struct meta_name_tab_entry)*cnt;
entries = erts_db_alloc_nt(ERTS_ALC_T_DB_NTAB_ENT, size);
ERTS_ETS_MISC_MEM_ADD(size);
new_entry = &entries[0];
entries[1] = *bucket;
}
else { /* multi */
size_t size, old_size;
Uint i;
cnt = unsigned_val(bucket->u.mcnt);
for (i=0; i<cnt; i++) {
if (bucket->pu.mvec[i].u.name_atom == name_atom) {
goto done;
}
}
old_size = sizeof(struct meta_name_tab_entry)*cnt;
size = sizeof(struct meta_name_tab_entry)*(cnt+1);
entries = erts_db_realloc_nt(ERTS_ALC_T_DB_NTAB_ENT,
bucket->pu.mvec,
old_size,
size);
ERTS_ETS_MISC_MEM_ADD(size-old_size);
new_entry = &entries[cnt];
cnt++;
}
bucket->pu.mvec = entries;
bucket->u.mcnt = make_small(cnt);
}
new_entry->pu.tb = tb;
new_entry->u.name_atom = name_atom;
ret = 1; /* Ok */
done:
if (!have_lock)
erts_rwmtx_rwunlock(rwlock);
return ret;
}
static int remove_named_tab(DbTable *tb, int have_lock)
{
int ret = 0;
erts_rwmtx_t* rwlock;
Eterm name_atom = tb->common.the_name;
struct meta_name_tab_entry* bucket = meta_name_tab_bucket(name_atom,
&rwlock);
ASSERT(is_table_named(tb));
if (META_DB_LOCK_FREE())
have_lock = 1;
if (!have_lock && erts_rwmtx_tryrwlock(rwlock) == EBUSY) {
db_unlock(tb, LCK_WRITE);
erts_rwmtx_rwlock(rwlock);
db_lock(tb, LCK_WRITE);
}
ERTS_LC_ASSERT(erts_lc_rwmtx_is_rwlocked(rwlock) || META_DB_LOCK_FREE());
if (bucket->pu.tb == NULL) {
goto done;
}
else if (is_atom(bucket->u.name_atom)) { /* single */
if (bucket->u.name_atom != name_atom) {
goto done;
}
bucket->pu.tb = NULL;
}
else { /* multi */
Uint cnt = unsigned_val(bucket->u.mcnt);
Uint i = 0;
for (;;) {
if (bucket->pu.mvec[i].u.name_atom == name_atom) {
break;
}
if (++i >= cnt) {
goto done;
}
}
if (cnt == 2) { /* multi -> single */
size_t size;
struct meta_name_tab_entry* entries = bucket->pu.mvec;
*bucket = entries[1-i];
size = sizeof(struct meta_name_tab_entry)*cnt;
erts_db_free_nt(ERTS_ALC_T_DB_NTAB_ENT, entries, size);
ERTS_ETS_MISC_MEM_ADD(-size);
ASSERT(is_atom(bucket->u.name_atom));
}
else {
size_t size, old_size;
ASSERT(cnt > 2);
bucket->u.mcnt = make_small(--cnt);
if (i != cnt) {
/* reposition last one before realloc destroys it */
bucket->pu.mvec[i] = bucket->pu.mvec[cnt];
}
old_size = sizeof(struct meta_name_tab_entry)*(cnt+1);
size = sizeof(struct meta_name_tab_entry)*cnt;
bucket->pu.mvec = erts_db_realloc_nt(ERTS_ALC_T_DB_NTAB_ENT,
bucket->pu.mvec,
old_size,
size);
ERTS_ETS_MISC_MEM_ADD(size - old_size);
}
}
ret = 1; /* Ok */
done:
if (!have_lock)
erts_rwmtx_rwunlock(rwlock);
return ret;
}
/* Do a fast fixation of a hash table.
** Must be matched by a local unfix before releasing table lock.
*/
static ERTS_INLINE void local_fix_table(DbTable* tb)
{
erts_refc_inc(&tb->common.fix_count, 1);
}
static ERTS_INLINE void local_unfix_table(DbTable* tb)
{
if (erts_refc_dectest(&tb->common.fix_count, 0) == 0) {
ASSERT(IS_HASH_TABLE(tb->common.status));
db_unfix_table_hash(&(tb->hash));
}
}
/*
* BIFs.
*/
BIF_RETTYPE ets_safe_fixtable_2(BIF_ALIST_2)
{
DbTable *tb;
db_lock_kind_t kind;
#ifdef HARDDEBUG
erts_fprintf(stderr,
"ets:safe_fixtable(%T,%T); Process: %T, initial: %T:%T/%bpu\n",
BIF_ARG_1, BIF_ARG_2, BIF_P->common.id,
BIF_P->u.initial[0], BIF_P->u.initial[1], BIF_P->u.initial[2]);
#endif
kind = (BIF_ARG_2 == am_true) ? LCK_READ : LCK_WRITE_REC;
DB_BIF_GET_TABLE(tb, DB_READ, kind, BIF_ets_safe_fixtable_2);
if (BIF_ARG_2 == am_true) {
fix_table_locked(BIF_P, tb);
}
else if (BIF_ARG_2 == am_false) {
if (IS_FIXED(tb)) {
unfix_table_locked(BIF_P, tb, &kind);
}
}
else {
db_unlock(tb, kind);
BIF_ERROR(BIF_P, BADARG);
}
db_unlock(tb, kind);
BIF_RET(am_true);
}
/*
** Returns the first Key in a table
*/
BIF_RETTYPE ets_first_1(BIF_ALIST_1)
{
DbTable* tb;
int cret;
Eterm ret;
CHECK_TABLES();
DB_BIF_GET_TABLE(tb, DB_READ, LCK_READ, BIF_ets_first_1);
cret = tb->common.meth->db_first(BIF_P, tb, &ret);
db_unlock(tb, LCK_READ);
if (cret != DB_ERROR_NONE) {
BIF_ERROR(BIF_P, BADARG);
}
BIF_RET(ret);
}
/*
** The next BIF, given a key, return the "next" key
*/
BIF_RETTYPE ets_next_2(BIF_ALIST_2)
{
DbTable* tb;