Add notification thread skeleton

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

diff --git a/src/bin/lttng-sessiond/notification-thread.h b/src/bin/lttng-sessiond/notification-thread.h
new file mode 100644 (file)
index 0000000..7f797e2
--- /dev/null
+++ b/src/bin/lttng-sessiond/notification-thread.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef NOTIFICATION_THREAD_H
+#define NOTIFICATION_THREAD_H
+
+#include <urcu/wfcqueue.h>
+#include <lttng/trigger/trigger.h>
+
+enum notification_command_type {
+       NOTIFICATION_COMMAND_TYPE_NEW_TRIGGER,
+};
+
+struct notification_command {
+       /* Futex on which to wait for command reply. */
+       int32_t futex;
+       enum lttng_error_code result;
+       enum notification_command_type type;
+};
+
+struct notification_new_trigger_command {
+       struct notification_command parent;
+       /* Set to NULL if ownership was transfered. */
+       struct lttng_trigger *trigger;
+};
+
+/* Data passed to the thread on initialization. */
+struct notification_thread_data {
+       /*
+        * Queue of struct notification command.
+        * event_fd must be WRITE(2) to signal that a new command
+        * has been enqueued.
+        */
+       struct notification_cmd_queue {
+               int event_fd;
+               struct cds_wfcq_head head;
+               struct cds_wfcq_tail tail;
+       } cmd_queue;
+};
+
+struct notification_command *notification_new_trigger_command_create(
+               struct lttng_trigger *trigger);
+struct notification_command *notification_new_trigger_command_destroy(
+               struct lttng_trigger *trigger);
+
+void *thread_notification(void *data);
+
+int notification_thread_init_data(struct notification_thread_data **data);
+void notification_thread_destroy_data(struct notification_thread_data *data);
+
+#endif /* NOTIFICATION_THREAD_H */