Fix: semaphore semantics are expected from notification command eventfd

[lttng-tools.git] / src / bin / lttng-sessiond / notification-thread.c

diff --git a/src/bin/lttng-sessiond/notification-thread.c b/src/bin/lttng-sessiond/notification-thread.c
index e0937d8e58eb577d2f088968d7a16299fe5db4c8..70ab7bb5fceb974c0acd04a8003ae453ea5a2efe 100644 (file)
--- a/src/bin/lttng-sessiond/notification-thread.c
+++ b/src/bin/lttng-sessiond/notification-thread.c
@@ -209,7 +209,7 @@ struct notification_thread_handle *notification_thread_handle_create(
        }
 
        /* FIXME Replace eventfd by a pipe to support older kernels. */
-       handle->cmd_queue.event_fd = eventfd(0, EFD_CLOEXEC);
+       handle->cmd_queue.event_fd = eventfd(0, EFD_CLOEXEC | EFD_SEMAPHORE);
        if (handle->cmd_queue.event_fd < 0) {
                PERROR("eventfd notification command queue");
                goto error;