Add the sessiond notification-handling subsystem

[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..c401b41
--- /dev/null
+++ b/src/bin/lttng-sessiond/notification-thread.h
@@ -0,0 +1,73 @@
+/*
+ * 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/list.h>
+#include <urcu.h>
+#include <urcu/rculfhash.h>
+#include <lttng/trigger/trigger.h>
+#include <common/pipe.h>
+#include <common/compat/poll.h>
+#include <common/hashtable/hashtable.h>
+#include <pthread.h>
+
+struct notification_thread_handle {
+       /*
+        * Queue of struct notification command.
+        * event_fd must be WRITE(2) to signal that a new command
+        * has been enqueued.
+        */
+       struct {
+               int event_fd;
+               struct cds_list_head list;
+               pthread_mutex_t lock;
+       } cmd_queue;
+       /*
+        * Read side of pipes used to receive channel status info collected
+        * by the various consumer daemons.
+        */
+       struct {
+               int ust32_consumer;
+               int ust64_consumer;
+               int kernel_consumer;
+       } channel_monitoring_pipes;
+};
+
+struct notification_thread_state {
+       int notification_channel_socket;
+       struct lttng_poll_event events;
+       struct cds_lfht *client_socket_ht;
+       struct cds_lfht *channel_triggers_ht;
+       struct cds_lfht *channel_state_ht;
+       struct cds_lfht *notification_trigger_clients_ht;
+       struct cds_lfht *channels_ht;
+       struct cds_lfht *triggers_ht;
+};
+
+/* notification_thread_data takes ownership of the channel monitor pipes. */
+struct notification_thread_handle *notification_thread_handle_create(
+               struct lttng_pipe *ust32_channel_monitor_pipe,
+               struct lttng_pipe *ust64_channel_monitor_pipe,
+               struct lttng_pipe *kernel_channel_monitor_pipe);
+void notification_thread_handle_destroy(
+               struct notification_thread_handle *handle);
+
+void *thread_notification(void *data);
+
+#endif /* NOTIFICATION_THREAD_H */