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authorSverker Eriksson <[email protected]>2014-02-06 17:15:05 +0100
committerSverker Eriksson <[email protected]>2014-02-19 17:20:05 +0100
commit5006a54b032a82ad55f33e532e4068c34fe143a9 (patch)
treed21babce3f88e24915205e0011b4451645d61de0 /erts/emulator/beam
parentfdcdaca338849d7f63d4300e489318f6ee275d82 (diff)
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erts: Fix race bug in ets:all/0
causing recently created/deleted tables to not be included/excluded.
Diffstat (limited to 'erts/emulator/beam')
-rw-r--r--erts/emulator/beam/erl_db.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/erts/emulator/beam/erl_db.c b/erts/emulator/beam/erl_db.c
index 41e64fcd4f..a5d67571e2 100644
--- a/erts/emulator/beam/erl_db.c
+++ b/erts/emulator/beam/erl_db.c
@@ -1,7 +1,7 @@
/*
* %CopyrightBegin%
*
- * Copyright Ericsson AB 1996-2013. All Rights Reserved.
+ * Copyright Ericsson AB 1996-2014. 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
@@ -125,6 +125,7 @@ get_meta_main_tab_lock(unsigned slot)
static erts_smp_spinlock_t meta_main_tab_main_lock;
static Uint meta_main_tab_first_free; /* Index of first free slot */
static int meta_main_tab_cnt; /* Number of active tables */
+static int meta_main_tab_top; /* Highest ever used slot + 1 */
static Uint meta_main_tab_slot_mask; /* The slot index part of an unnamed table id */
static Uint meta_main_tab_seq_incr;
static Uint meta_main_tab_seq_cnt = 0; /* To give unique(-ish) table identifiers */
@@ -1469,6 +1470,10 @@ BIF_RETTYPE ets_new_2(BIF_ALIST_2)
ASSERT(slot>=0 && slot<db_max_tabs);
meta_main_tab_first_free = GET_NEXT_FREE_SLOT(slot);
meta_main_tab_cnt++;
+ if (slot >= meta_main_tab_top) {
+ ASSERT(slot == meta_main_tab_top);
+ meta_main_tab_top = slot + 1;
+ }
if (is_named) {
ret = BIF_ARG_1;
@@ -2058,27 +2063,31 @@ BIF_RETTYPE ets_all_0(BIF_ALIST_0)
{
DbTable* tb;
Eterm previous;
- int i, j;
+ int i;
Eterm* hp;
Eterm* hendp;
int t_tabs_cnt;
- int t_max_tabs;
+ int t_top;
erts_smp_spin_lock(&meta_main_tab_main_lock);
t_tabs_cnt = meta_main_tab_cnt;
- t_max_tabs = db_max_tabs;
+ t_top = meta_main_tab_top;
erts_smp_spin_unlock(&meta_main_tab_main_lock);
hp = HAlloc(BIF_P, 2*t_tabs_cnt);
hendp = hp + 2*t_tabs_cnt;
previous = NIL;
- j = 0;
- for(i = 0; (i < t_max_tabs && j < t_tabs_cnt); i++) {
+ for(i = 0; i < t_top; i++) {
erts_smp_rwmtx_t *mmtl = get_meta_main_tab_lock(i);
erts_smp_rwmtx_rlock(mmtl);
if (IS_SLOT_ALIVE(i)) {
- j++;
+ if (hp == hendp) {
+ /* Racing table creator, grab some more heap space */
+ t_tabs_cnt = 10;
+ hp = HAlloc(BIF_P, 2*t_tabs_cnt);
+ hendp = hp + 2*t_tabs_cnt;
+ }
tb = meta_main_tab[i].u.tb;
previous = CONS(hp, tb->common.id, previous);
hp += 2;
@@ -2849,6 +2858,7 @@ void init_db(void)
ERTS_ETS_MISC_MEM_ADD(size);
meta_main_tab_cnt = 0;
+ meta_main_tab_top = 0;
for (i=1; i<db_max_tabs; i++) {
SET_NEXT_FREE_SLOT(i-1,i);
}