Reference count ltt_session objects

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

diff --git a/src/bin/lttng-sessiond/session.h b/src/bin/lttng-sessiond/session.h
index 99b8c47112bd3f6d1032d7bdcf8e4439b07801ba..6a059798d925afbd681f07a898f866e7dc8374f2 100644 (file)
--- a/src/bin/lttng-sessiond/session.h
+++ b/src/bin/lttng-sessiond/session.h
@@ -67,6 +67,7 @@ struct ltt_session {
        char hostname[HOST_NAME_MAX]; /* Local hostname. */
        struct ltt_kernel_session *kernel_session;
        struct ltt_ust_session *ust_session;
+       struct urcu_ref ref;
        /*
         * Protect any read/write on this session data structure. This lock must be
         * acquired *before* using any public functions declared below. Use
@@ -75,6 +76,8 @@ struct ltt_session {
        pthread_mutex_t lock;
        struct cds_list_head list;
        uint64_t id;            /* session unique identifier */
+       /* Indicates if a destroy command has been applied to this session. */
+       bool destroyed;
        /* UID/GID of the user owning the session */
        uid_t uid;
        gid_t gid;
@@ -123,7 +126,7 @@ struct ltt_session {
        struct lttng_ht_node_u64 node;
        /*
         * The current archive id corresponds to the number of session rotations
-        * that have occured for this session. The archive id
+        * that have occurred for this session. The archive id
         * is used to tag the "generation" of a stream. This tag allows the
         * consumer and relay daemons to track when a given stream was created
         * during the lifetime of a session.
@@ -192,7 +195,7 @@ struct ltt_session {
        /*
         * Keep a state if this session was rotated after the last stop command.
         * We only allow one rotation after a stop. At destroy, we also need to
-        * know if a rotation occured since the last stop to rename the current
+        * know if a rotation occurred since the last stop to rename the current
         * chunk.
         */
        bool rotated_after_last_stop;
@@ -205,7 +208,6 @@ struct ltt_session {
 
 /* Prototypes */
 int session_create(char *name, uid_t uid, gid_t gid);
-int session_destroy(struct ltt_session *session);
 
 void session_lock(struct ltt_session *session);
 void session_lock_list(void);
@@ -213,6 +215,11 @@ int session_trylock_list(void);
 void session_unlock(struct ltt_session *session);
 void session_unlock_list(void);
 
+void session_destroy(struct ltt_session *session);
+
+bool session_get(struct ltt_session *session);
+void session_put(struct ltt_session *session);
+
 enum consumer_dst_type session_get_consumer_destination_type(
                const struct ltt_session *session);
 const char *session_get_net_consumer_hostname(
@@ -229,4 +236,7 @@ struct ltt_session_list *session_get_list(void);
 
 int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid);
 
+int session_reset_rotation_state(struct ltt_session *session,
+               enum lttng_rotation_state result);
+
 #endif /* _LTT_SESSION_H */