Wait for data availability when stopping a session

[lttng-tools.git] / src / common / consumer.h

diff --git a/src/common/consumer.h b/src/common/consumer.h
index fe1568382f3971728fb2a15fbc4b7bec348541d5..df002f81a606c62f75db59bf23d752ec29743e62 100644 (file)
--- a/src/common/consumer.h
+++ b/src/common/consumer.h
@@ -56,6 +56,8 @@ enum lttng_consumer_command {
        LTTNG_CONSUMER_ADD_RELAYD_SOCKET,
        /* Inform the consumer to kill a specific relayd connection */
        LTTNG_CONSUMER_DESTROY_RELAYD,
+       /* Return to the sessiond if there is data pending for a session */
+       LTTNG_CONSUMER_DATA_AVAILABLE,
 };
 
 /* State of each fd in consumer */
@@ -101,8 +103,10 @@ struct lttng_ust_lib_ring_buffer;
  * uniquely a stream.
  */
 struct lttng_consumer_stream {
-       /* Hash table node for both metadata and data type */
+       /* HT node used by the data_ht and metadata_ht */
        struct lttng_ht_node_ulong node;
+       /* HT node used in consumer_data.stream_list_ht */
+       struct lttng_ht_node_ulong node_session_id;
        struct lttng_consumer_channel *chan;    /* associated channel */
        /*
         * key is the key used by the session daemon to refer to the
@@ -137,6 +141,10 @@ struct lttng_consumer_stream {
        uint64_t relayd_stream_id;
        /* Next sequence number to use for trace packet */
        uint64_t next_net_seq_num;
+       /* Lock to use the stream FDs since they are used between threads. */
+       pthread_mutex_t lock;
+       /* Tracing session id */
+       uint64_t session_id;
 };
 
 /*
@@ -272,6 +280,15 @@ struct lttng_consumer_global_data {
         * stream has an index which associate the right relayd socket to use.
         */
        struct lttng_ht *relayd_ht;
+
+       /*
+        * This hash table contains all streams (metadata and data) indexed by
+        * session id. In other words, the ht is indexed by session id and each
+        * bucket contains the list of associated streams.
+        *
+        * This HT uses the "node_session_id" of the consumer stream.
+        */
+       struct lttng_ht *stream_list_ht;
 };
 
 /* Defined in consumer.c and coupled with explanations */
@@ -338,6 +355,7 @@ extern struct lttng_consumer_stream *consumer_allocate_stream(
                gid_t gid,
                int net_index,
                int metadata_flag,
+               uint64_t session_id,
                int *alloc_ret);
 extern void consumer_del_stream(struct lttng_consumer_stream *stream,
                struct lttng_ht *ht);
@@ -396,5 +414,6 @@ int consumer_add_relayd_socket(int net_seq_idx, int sock_type,
                struct pollfd *consumer_sockpoll, struct lttcomm_sock *relayd_sock);
 void consumer_flag_relayd_for_destroy(
                struct consumer_relayd_sock_pair *relayd);
+int consumer_data_available(uint64_t id);
 
 #endif /* LIB_CONSUMER_H */