core: Don't create snapshots with locks.

Snapshots are immutable and are never changed. Allocating them
with a lock is wasteful.

Review: https://reviewboard.asterisk.org/r/4469/
........

Merged revisions 432742 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@432743 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/endpoints.c

@@ -467,9 +467,10 @@ struct ast_endpoint_snapshot *ast_endpoint_snapshot_create(
 
 	channel_count = ao2_container_count(endpoint->channel_ids);
 
-	snapshot = ao2_alloc(
+	snapshot = ao2_alloc_options(
 		sizeof(*snapshot) + channel_count * sizeof(char *),
-		endpoint_snapshot_dtor);
+		endpoint_snapshot_dtor,
+		AO2_ALLOC_OPT_LOCK_NOLOCK);
 
 	if (ast_string_field_init(snapshot, 80) != 0) {
 		return NULL;

main/stasis_bridges.c

@@ -232,7 +232,8 @@ struct ast_bridge_snapshot *ast_bridge_snapshot_create(struct ast_bridge *bridge
 	RAII_VAR(struct ast_bridge_snapshot *, snapshot, NULL, ao2_cleanup);
 	struct ast_bridge_channel *bridge_channel;
 
-	snapshot = ao2_alloc(sizeof(*snapshot), bridge_snapshot_dtor);
+	snapshot = ao2_alloc_options(sizeof(*snapshot), bridge_snapshot_dtor,
+		AO2_ALLOC_OPT_LOCK_NOLOCK);
 	if (!snapshot || ast_string_field_init(snapshot, 128)) {
 		return NULL;
 	}

main/stasis_channels.c

@@ -209,7 +209,8 @@ struct ast_channel_snapshot *ast_channel_snapshot_create(struct ast_channel *cha
 		return NULL;
 	}
 
-	snapshot = ao2_alloc(sizeof(*snapshot), channel_snapshot_dtor);
+	snapshot = ao2_alloc_options(sizeof(*snapshot), channel_snapshot_dtor,
+		AO2_ALLOC_OPT_LOCK_NOLOCK);
 	if (!snapshot || ast_string_field_init(snapshot, 1024)) {
 		ao2_cleanup(snapshot);
 		return NULL;
@@ -617,7 +618,8 @@ void ast_multi_channel_blob_add_channel(struct ast_multi_channel_blob *obj, cons
 		return;
 	}
 
-	role_snapshot = ao2_alloc(sizeof(*role_snapshot) + role_len, channel_role_snapshot_dtor);
+	role_snapshot = ao2_alloc_options(sizeof(*role_snapshot) + role_len, channel_role_snapshot_dtor,
+		AO2_ALLOC_OPT_LOCK_NOLOCK);
 	if (!role_snapshot) {
 		return;
 	}