/*
- * event-notifier-notification.c
+ * SPDX-License-Identifier: LGPL-2.1-only
*
* Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _LGPL_SOURCE
{
struct lttng_event_notifier_group *event_notifier_group =
event_notifier->group;
+ struct lttng_counter *error_counter;
size_t dimension_index[1];
int ret;
+ error_counter = CMM_LOAD_SHARED(event_notifier_group->error_counter);
+ /*
+ * load-acquire paired with store-release orders creation of the
+ * error counter and setting error_counter_len before the
+ * error_counter is used.
+ * Currently a full memory barrier is used, which could be
+ * turned into acquire-release barriers.
+ */
+ cmm_smp_mb();
+ /* This group may not have an error counter attached to it. */
+ if (!error_counter)
+ return;
+
dimension_index[0] = event_notifier->error_counter_index;
ret = event_notifier_group->error_counter->ops->counter_add(
- event_notifier_group->error_counter->counter,
- dimension_index, 1);
+ error_counter->counter, dimension_index, 1);
if (ret)
WARN_ON_ONCE(1);
}
ssize_t ret;
size_t content_len;
int iovec_count = 1;
- struct lttng_ust_event_notifier_notification ust_notif;
+ struct lttng_ust_event_notifier_notification ust_notif = {0};
struct iovec iov[2];
assert(notif);