aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/beam/erl_node_tables.c
diff options
context:
space:
mode:
Diffstat (limited to 'erts/emulator/beam/erl_node_tables.c')
-rw-r--r--erts/emulator/beam/erl_node_tables.c31
1 files changed, 25 insertions, 6 deletions
diff --git a/erts/emulator/beam/erl_node_tables.c b/erts/emulator/beam/erl_node_tables.c
index 5865d33138..a3a1d95cd3 100644
--- a/erts/emulator/beam/erl_node_tables.c
+++ b/erts/emulator/beam/erl_node_tables.c
@@ -80,6 +80,8 @@ dist_table_alloc(void *dep_tmpl)
Eterm chnl_nr;
Eterm sysname;
DistEntry *dep;
+ erts_smp_rwmtx_opt_t rwmtx_opt = ERTS_SMP_THR_OPTS_DEFAULT_INITER;
+ rwmtx_opt.type = ERTS_SMP_RWMTX_TYPE_FREQUENT_READ;
if(((DistEntry *) dep_tmpl) == erts_this_dist_entry)
return dep_tmpl;
@@ -92,7 +94,7 @@ dist_table_alloc(void *dep_tmpl)
dep->prev = NULL;
erts_refc_init(&dep->refc, -1);
- erts_smp_rwmtx_init_x(&dep->rwmtx, "dist_entry", chnl_nr);
+ erts_smp_rwmtx_init_opt_x(&dep->rwmtx, &rwmtx_opt, "dist_entry", chnl_nr);
dep->sysname = sysname;
dep->cid = NIL;
dep->connection_id = 0;
@@ -580,6 +582,18 @@ ErlNode *erts_find_or_insert_node(Eterm sysname, Uint creation)
ErlNode ne;
ne.sysname = sysname;
ne.creation = creation;
+
+ erts_smp_rwmtx_rlock(&erts_node_table_rwmtx);
+ res = hash_get(&erts_node_table, (void *) &ne);
+ if (res && res != erts_this_node) {
+ long refc = erts_refc_inctest(&res->refc, 0);
+ if (refc < 2) /* New or pending delete */
+ erts_refc_inc(&res->refc, 1);
+ }
+ erts_smp_rwmtx_runlock(&erts_node_table_rwmtx);
+ if (res)
+ return res;
+
erts_smp_rwmtx_rwlock(&erts_node_table_rwmtx);
res = hash_put(&erts_node_table, (void *) &ne);
ASSERT(res);
@@ -696,8 +710,12 @@ erts_set_this_node(Eterm sysname, Uint creation)
void erts_init_node_tables(void)
{
+ erts_smp_rwmtx_opt_t rwmtx_opt = ERTS_SMP_THR_OPTS_DEFAULT_INITER;
HashFunctions f;
+ rwmtx_opt.type = ERTS_SMP_RWMTX_TYPE_FREQUENT_READ;
+ rwmtx_opt.lived = ERTS_SMP_RWMTX_LONG_LIVED;
+
f.hash = (H_FUN) dist_table_hash;
f.cmp = (HCMP_FUN) dist_table_cmp;
f.alloc = (HALLOC_FUN) dist_table_alloc;
@@ -719,9 +737,10 @@ void erts_init_node_tables(void)
erts_this_dist_entry->prev = NULL;
erts_refc_init(&erts_this_dist_entry->refc, 1); /* erts_this_node */
- erts_smp_rwmtx_init_x(&erts_this_dist_entry->rwmtx,
- "dist_entry",
- make_small(ERST_INTERNAL_CHANNEL_NO));
+ erts_smp_rwmtx_init_opt_x(&erts_this_dist_entry->rwmtx,
+ &rwmtx_opt,
+ "dist_entry",
+ make_small(ERST_INTERNAL_CHANNEL_NO));
erts_this_dist_entry->sysname = am_Noname;
erts_this_dist_entry->cid = NIL;
erts_this_dist_entry->connection_id = 0;
@@ -772,8 +791,8 @@ void erts_init_node_tables(void)
(void) hash_put(&erts_node_table, (void *) erts_this_node);
- erts_smp_rwmtx_init(&erts_node_table_rwmtx, "node_table");
- erts_smp_rwmtx_init(&erts_dist_table_rwmtx, "dist_table");
+ erts_smp_rwmtx_init_opt(&erts_node_table_rwmtx, &rwmtx_opt, "node_table");
+ erts_smp_rwmtx_init_opt(&erts_dist_table_rwmtx, &rwmtx_opt, "dist_table");
references_atoms_need_init = 1;
}