X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=ltt-sessiond%2Fsession.h;h=d87b54daa7ecd9b51ed91feac0201d21b434f4e6;hp=5bfe16ac04122a0e9c079ef02512a1cea54bc1c4;hb=050349bbb362ea993533591532643022efeab864;hpb=5b74c7b1ca96399ba5c8bd0ce6974aea671198eb

diff --git a/ltt-sessiond/session.h b/ltt-sessiond/session.h
index 5bfe16ac0..d87b54daa 100644
--- a/ltt-sessiond/session.h
+++ b/ltt-sessiond/session.h
@@ -1,10 +1,10 @@
-/* 
+/*
  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
+ * as published by the Free Software Foundation; only version 2
+ * of the License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -19,30 +19,63 @@
 #ifndef _LTT_SESSION_H
 #define _LTT_SESSION_H
 
-/* Global session list */
+#include <urcu/list.h>
+
+/*
+ * Tracing session list
+ *
+ * Statically declared in session.c and can be accessed by using
+ * get_session_list() function that returns the pointer to the list.
+ */
 struct ltt_session_list {
+	/*
+	 * This lock protects any read/write access to the list and count (which is
+	 * basically the list size). All public functions in session.c acquire this
+	 * lock and release it before returning. If none of those functions are
+	 * used, the lock MUST be acquired in order to iterate or/and do any
+	 * actions on that list.
+	 */
+	pthread_mutex_t lock;
+
+	/*
+	 * Number of element in the list. The session list lock MUST be acquired if
+	 * this counter is used when iterating over the session list.
+	 */
+	unsigned int count;
+
+	/* Linked list head */
 	struct cds_list_head head;
 };
 
-/* ltt-session - This data structure contains information needed
- * to identify a tracing session for both LTTng and UST.
+/*
+ * This data structure contains information needed to identify a tracing
+ * session for both LTTng and UST.
  */
 struct ltt_session {
 	char *name;
-	struct cds_list_head list;
-	uuid_t uuid;
+	char *path;
+	struct ltt_kernel_session *kernel_session;
 	struct cds_list_head ust_traces;
-	struct cds_list_head lttng_traces;
-	pid_t ust_consumer;
-	pid_t lttng_consumer;
+	unsigned int ust_trace_count;
+	/*
+	 * Protect any read/write on this session data structure. This lock must be
+	 * acquired *before* using any public functions declared below. Use
+	 * lock_session() and unlock_session() for that.
+	 */
+	pthread_mutex_t lock;
+	struct cds_list_head list;
 };
 
 /* Prototypes */
-int create_session(char *name, uuid_t *session_id);
-int destroy_session(uuid_t *uuid);
-void get_lttng_session(struct lttng_session *lt);
-struct ltt_session *find_session_by_uuid(uuid_t session_id);
+int create_session(char *name, char *path);
+int destroy_session(char *name);
+
+void lock_session(struct ltt_session *session);
+void lock_session_list(void);
+void unlock_session(struct ltt_session *session);
+void unlock_session_list(void);
+
 struct ltt_session *find_session_by_name(char *name);
-unsigned int get_session_count(void);
+struct ltt_session_list *get_session_list(void);
 
 #endif /* _LTT_SESSION_H */