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authorLukas Larsson <lukas@erlang-solutions.com>2013-04-23 09:42:38 +0200
committerLukas Larsson <lukas@erlang-solutions.com>2013-05-16 09:37:06 +0200
commit2d7bd4fdb3e5a5143ec2252b08734fa56951036a (patch)
tree39fc4c7ea57cda2df7569219a72791e16c341f26 /erts/emulator/beam/dist.c
parent1209686a614736ab091a5c036a14645610866ee5 (diff)
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Change rwlock to rlock where possible
Having rwlock could cause high unneccesary contention on the dist table when calling erlang:nodes() from many schedulers at the same time.
Diffstat (limited to 'erts/emulator/beam/dist.c')
-rw-r--r--erts/emulator/beam/dist.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/erts/emulator/beam/dist.c b/erts/emulator/beam/dist.c
index 0781665f05..44f4eb9d43 100644
--- a/erts/emulator/beam/dist.c
+++ b/erts/emulator/beam/dist.c
@@ -455,7 +455,7 @@ int erts_do_net_exits(DistEntry *dep, Eterm reason)
Eterm nd_reason = (reason == am_no_network
? am_no_network
: am_net_kernel_terminated);
- erts_smp_rwmtx_rwlock(&erts_dist_table_rwmtx);
+ erts_smp_rwmtx_rlock(&erts_dist_table_rwmtx);
for (tdep = erts_hidden_dist_entries; tdep; tdep = tdep->next)
no_dist_port++;
@@ -464,7 +464,7 @@ int erts_do_net_exits(DistEntry *dep, Eterm reason)
/* KILL all port controllers */
if (no_dist_port == 0)
- erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
+ erts_smp_rwmtx_runlock(&erts_dist_table_rwmtx);
else {
Eterm def_buf[128];
int i = 0;
@@ -483,7 +483,7 @@ int erts_do_net_exits(DistEntry *dep, Eterm reason)
ASSERT(is_internal_port(tdep->cid));
dist_port[i++] = tdep->cid;
}
- erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
+ erts_smp_rwmtx_runlock(&erts_dist_table_rwmtx);
for (i = 0; i < no_dist_port; i++) {
Port *prt = erts_port_lookup(dist_port[i],
@@ -2560,9 +2560,9 @@ BIF_RETTYPE setnode_2(BIF_ALIST_2)
erts_smp_proc_unlock(net_kernel, ERTS_PROC_LOCK_MAIN);
#ifdef DEBUG
- erts_smp_rwmtx_rwlock(&erts_dist_table_rwmtx);
+ erts_smp_rwmtx_rlock(&erts_dist_table_rwmtx);
ASSERT(!erts_visible_dist_entries && !erts_hidden_dist_entries);
- erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
+ erts_smp_rwmtx_runlock(&erts_dist_table_rwmtx);
#endif
erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
@@ -2912,7 +2912,7 @@ BIF_RETTYPE nodes_1(BIF_ALIST_1)
length = 0;
- erts_smp_rwmtx_rwlock(&erts_dist_table_rwmtx);
+ erts_smp_rwmtx_rlock(&erts_dist_table_rwmtx);
ASSERT(erts_no_of_not_connected_dist_entries >= 0);
ASSERT(erts_no_of_hidden_dist_entries >= 0);
@@ -2929,7 +2929,7 @@ BIF_RETTYPE nodes_1(BIF_ALIST_1)
result = NIL;
if (length == 0) {
- erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
+ erts_smp_rwmtx_runlock(&erts_dist_table_rwmtx);
goto done;
}
@@ -2958,7 +2958,7 @@ BIF_RETTYPE nodes_1(BIF_ALIST_1)
hp += 2;
}
ASSERT(endp == hp);
- erts_smp_rwmtx_rwunlock(&erts_dist_table_rwmtx);
+ erts_smp_rwmtx_runlock(&erts_dist_table_rwmtx);
done:
UnUseTmpHeap(2,BIF_P);