Add a -l/--load option to the session-daemon

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

diff --git a/src/bin/lttng-sessiond/load-session-thread.c b/src/bin/lttng-sessiond/load-session-thread.c
new file mode 100644 (file)
index 0000000..845948e
--- /dev/null
+++ b/src/bin/lttng-sessiond/load-session-thread.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2014 - 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.
+ */
+
+#define _GNU_SOURCE
+#include <common/error.h>
+#include <common/config/config.h>
+
+#include "load-session-thread.h"
+#include "lttng-sessiond.h"
+
+/*
+ * Destroy the thread data previously created with the init function.
+ */
+void load_session_destroy_data(struct load_session_thread_data *data)
+{
+       if (!data) {
+               return;
+       }
+
+       if (data->sem_initialized) {
+               int ret;
+
+               ret = sem_destroy(&data->message_thread_ready);
+               if (ret) {
+                       PERROR("sem_destroy message_thread_ready");
+               }
+       }
+}
+
+/*
+ * Initialize the thread data. This MUST be called before the thread load
+ * session is created.
+ *
+ * Return 0 on success else a negative value. Note that the destroy function
+ * can be called with no or partially initialized data.
+ */
+int load_session_init_data(struct load_session_thread_data **data)
+{
+       int ret;
+       struct load_session_thread_data *_data;
+
+       assert(data);
+
+       /*
+        * Allocate memory here since this function is called from the main thread
+        * can die *before* the end of the load session thread.
+        */
+       _data = zmalloc(sizeof(*_data));
+       if (!_data) {
+               PERROR("zmalloc load session info");
+               goto error;
+       }
+       ret = sem_init(&_data->message_thread_ready, 0, 0);
+       if (ret) {
+               PERROR("sem_init message_thread_ready");
+               goto error;
+       }
+       _data->sem_initialized = 1;
+
+       *data = _data;
+       return 0;
+
+error:
+       return -1;
+}
+
+/*
+ * This thread loads session configurations once the session daemon is
+ * ready to process client messages.
+ */
+void *thread_load_session(void *data)
+{
+       int ret;
+       struct load_session_thread_data *info = data;
+
+       DBG("[load-session-thread] Load session");
+
+       ret = sem_wait(&info->message_thread_ready);
+       if (ret) {
+               PERROR("sem_wait message_thread_ready");
+               goto end;
+       }
+
+       ret = config_load_session(info->path, NULL, 0);
+       if (ret) {
+               ERR("Session load failed: %s", error_get_str(ret));
+       }
+
+end:
+       sessiond_notify_ready();
+       return NULL;
+}