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-rw-r--r--erts/doc/src/erlang.xml6
-rw-r--r--erts/emulator/beam/erl_bif_info.c3
-rw-r--r--erts/emulator/beam/erl_db.c26
-rw-r--r--erts/emulator/beam/erl_db.h3
-rw-r--r--erts/emulator/test/system_info_SUITE.erl17
5 files changed, 47 insertions, 8 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index cff56b9cb8..5e0d30ebb7 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -8166,6 +8166,12 @@ ok
<c>erl(1)</c>.
</p>
</item>
+ <tag><marker id="system_info_ets_count"/>
+ <c>ets_count</c></tag>
+ <item>
+ <p>Returns the number of ETS tables currently existing at the
+ local node.</p>
+ </item>
<tag><marker id="system_info_ets_limit"/>
<c>ets_limit</c></tag>
<item>
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index 8b2b1a58c7..5789fa8e71 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -3129,6 +3129,9 @@ BIF_RETTYPE system_info_1(BIF_ALIST_1)
else if (ERTS_IS_ATOM_STR("ets_limit",BIF_ARG_1)) {
BIF_RET(make_small(erts_db_get_max_tabs()));
}
+ else if (ERTS_IS_ATOM_STR("ets_count",BIF_ARG_1)) {
+ BIF_RET(make_small(erts_ets_table_count()));
+ }
else if (ERTS_IS_ATOM_STR("atom_limit",BIF_ARG_1)) {
BIF_RET(make_small(erts_get_atom_limit()));
}
diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c
index c1eaaeee06..c9ab75fc88 100644
--- a/erts/emulator/beam/erl_db.c
+++ b/erts/emulator/beam/erl_db.c
@@ -450,7 +450,7 @@ save_sched_table(Process *c_p, DbTable *tb)
DbTable *first;
ASSERT(esdp);
- esdp->ets_tables.count++;
+ erts_atomic_inc_nob(&esdp->ets_tables.count);
erts_refc_inc(&tb->common.refc, 1);
first = esdp->ets_tables.clist;
@@ -474,8 +474,8 @@ remove_sched_table(ErtsSchedulerData *esdp, DbTable *tb)
ASSERT(erts_get_ref_numbers_thr_id(ERTS_MAGIC_BIN_REFN(tb->common.btid))
== (Uint32) esdp->no);
- ASSERT(esdp->ets_tables.count > 0);
- esdp->ets_tables.count--;
+ 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) {
@@ -2446,7 +2446,7 @@ ets_all_reply(ErtsSchedulerData *esdp, ErtsEtsAllReq **reqpp,
ASSERT(!*tablepp);
/* Max heap size needed... */
- sz = esdp->ets_tables.count;
+ sz = erts_atomic_read_nob(&esdp->ets_tables.count);
sz *= ERTS_MAGIC_REF_THING_SIZE + 2;
sz += 3 + ERTS_REF_THING_SIZE;
hfragp = new_message_buffer(sz);
@@ -2530,7 +2530,8 @@ erts_handle_yielded_ets_all_request(ErtsSchedulerData *esdp,
if (!eaydp->queue)
return 0; /* All work completed! */
- if (yc < ERTS_ETS_ALL_TB_YCNT_START && yc > esdp->ets_tables.count)
+ if (yc < ERTS_ETS_ALL_TB_YCNT_START &&
+ yc > erts_atomic_read_nob(&esdp->ets_tables.count))
return 1; /* Yield! */
eaydp->ongoing = ongoing = eaydp->queue;
@@ -2609,7 +2610,6 @@ BIF_RETTYPE ets_internal_request_all_0(BIF_ALIST_0)
BIF_RET(ref);
}
-
/*
** db_slot(Db, Slot) -> [Items].
*/
@@ -3539,7 +3539,7 @@ erts_ets_sched_spec_data_init(ErtsSchedulerData *esdp)
eaydp->tab = NULL;
eaydp->queue = NULL;
esdp->ets_tables.clist = NULL;
- esdp->ets_tables.count = 0;
+ erts_atomic_init_nob(&esdp->ets_tables.count, 0);
}
@@ -4347,6 +4347,18 @@ erts_db_get_max_tabs()
return db_max_tabs;
}
+Uint erts_ets_table_count(void)
+{
+ Uint tb_count = 0;
+ Uint six;
+
+ for (six = 0; six < erts_no_schedulers; six++) {
+ ErtsSchedulerData *esdp = &erts_aligned_scheduler_data[six].esd;
+ tb_count += erts_atomic_read_nob(&esdp->ets_tables.count);
+ }
+ return tb_count;
+}
+
/*
* For testing of meta tables only.
*
diff --git a/erts/emulator/beam/erl_db.h b/erts/emulator/beam/erl_db.h
index db86c81914..1664db9a41 100644
--- a/erts/emulator/beam/erl_db.h
+++ b/erts/emulator/beam/erl_db.h
@@ -45,7 +45,7 @@ typedef struct {
} ErtsEtsAllYieldData;
typedef struct {
- Uint count;
+ erts_atomic_t count;
DbTable *clist;
} ErtsEtsTables;
@@ -69,6 +69,7 @@ typedef struct {
/*TT*/
Uint erts_get_ets_misc_mem_size(void);
+Uint erts_ets_table_count(void);
typedef struct {
DbTableCommon common;
diff --git a/erts/emulator/test/system_info_SUITE.erl b/erts/emulator/test/system_info_SUITE.erl
index fdf4aab24d..7309908337 100644
--- a/erts/emulator/test/system_info_SUITE.erl
+++ b/erts/emulator/test/system_info_SUITE.erl
@@ -37,6 +37,7 @@
-export([process_count/1, system_version/1, misc_smoke_tests/1,
heap_size/1, wordsize/1, memory/1, ets_limit/1, atom_limit/1,
+ ets_count/1,
atom_count/1]).
suite() ->
@@ -45,6 +46,7 @@ suite() ->
all() ->
[process_count, system_version, misc_smoke_tests,
+ ets_count,
heap_size, wordsize, memory, ets_limit, atom_limit, atom_count].
%%%
@@ -478,6 +480,21 @@ get_node_name(Config) ->
++ "-"
++ integer_to_list(erlang:unique_integer([positive]))).
+ets_count(Config) when is_list(Config) ->
+ [ets_count_do([Type | Named])
+ || Type <- [set, bag, duplicate_bag, ordered_set],
+ Named <- [[named_table], []]
+ ],
+ ok.
+
+ets_count_do(Opts) ->
+ Before = erlang:system_info(ets_count),
+ T = ets:new(?MODULE, Opts),
+ After = erlang:system_info(ets_count),
+ After = Before + 1,
+ ets:delete(T),
+ Before = erlang:system_info(ets_count).
+
%% Verify system_info(ets_limit) reflects max ETS table settings.
ets_limit(Config0) when is_list(Config0) ->
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 04:05:17 +0000