Keep read-only copies of fields from the channel to the stream

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

diff --git a/src/common/consumer/consumer.h b/src/common/consumer/consumer.h
index 256ea1976016feffcf805d5d5bd0df3d8598a2bf..a7d0ee1a706cc719f6877b168a6819f97f72b0ac 100644 (file)
--- a/src/common/consumer/consumer.h
+++ b/src/common/consumer/consumer.h
@@ -61,6 +61,9 @@ enum lttng_consumer_command {
        LTTNG_CONSUMER_DISCARDED_EVENTS,
        LTTNG_CONSUMER_LOST_PACKETS,
        LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL,
+       LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE,
+       LTTNG_CONSUMER_ROTATE_RENAME,
+       LTTNG_CONSUMER_MKDIR,
 };
 
 /* State of each fd in consumer */
@@ -160,6 +163,7 @@ struct lttng_consumer_channel {
 
        /* Metadata cache is metadata channel */
        struct consumer_metadata_cache *metadata_cache;
+
        /* For UST metadata periodical flush */
        int switch_timer_enabled;
        timer_t switch_timer;
@@ -170,6 +174,10 @@ struct lttng_consumer_channel {
        timer_t live_timer;
        int live_timer_error;
 
+       /* For channel monitoring timer. */
+       int monitor_timer_enabled;
+       timer_t monitor_timer;
+
        /* On-disk circular buffer */
        uint64_t tracefile_size;
        uint64_t tracefile_count;
@@ -218,6 +226,8 @@ struct lttng_consumer_channel {
        uint64_t discarded_events;
        /* Total number of missed packets due to overwriting (overwrite). */
        uint64_t lost_packets;
+
+       bool streams_sent_to_relayd;
 };
 
 /*
@@ -337,9 +347,9 @@ struct lttng_consumer_stream {
         * Lock to use the stream FDs since they are used between threads.
         *
         * This is nested INSIDE the consumer_data lock.
-        * This is nested INSIDE the metadata cache lock.
         * This is nested INSIDE the channel lock.
         * This is nested INSIDE the channel timer lock.
+        * This is nested OUTSIDE the metadata cache lock.
         * This is nested OUTSIDE consumer_relayd_sock_pair lock.
         */
        pthread_mutex_t lock;
@@ -390,9 +400,9 @@ struct lttng_consumer_stream {
        /* Copy of the sequence number of the last packet extracted. */
        uint64_t last_sequence_number;
        /*
-        * FD of the index file for this stream.
+        * Index file object of the index file for this stream.
         */
-       int index_fd;
+       struct lttng_index_file *index_file;
 
        /*
         * Local pipe to extract data when using splice.
@@ -405,6 +415,17 @@ struct lttng_consumer_stream {
        pthread_cond_t metadata_rdv;
        pthread_mutex_t metadata_rdv_lock;
 
+       /*
+        * Read-only copies of channel values. We cannot safely access the
+        * channel from a stream, so we need to have a local copy of these
+        * fields in the stream object. These fields should be removed from
+        * the stream objects when we introduce refcounting.
+        */
+       struct {
+               char path[LTTNG_PATH_MAX];
+               uint64_t tracefile_size;
+       } channel_read_only_attributes;
+
        /* Indicate if the stream still has some data to be read. */
        unsigned int has_data:1;
        /*
@@ -539,6 +560,11 @@ struct lttng_consumer_local_data {
        int consumer_should_quit[2];
        /* Metadata poll thread pipe. Transfer metadata stream to it */
        struct lttng_pipe *consumer_metadata_pipe;
+       /*
+        * Pipe used by the channel monitoring timers to provide state samples
+        * to the session daemon (write-only).
+        */
+       int channel_monitor_pipe;
 };
 
 /*
@@ -591,6 +617,21 @@ struct lttng_consumer_global_data {
        struct lttng_ht *stream_per_chan_id_ht;
 };
 
+/*
+ * Set to nonzero when the consumer is exiting. Updated by signal
+ * handler and thread exit, read by threads.
+ */
+extern int consumer_quit;
+
+/*
+ * Set to nonzero when the consumer is exiting. Updated by signal
+ * handler and thread exit, read by threads.
+ */
+extern int consumer_quit;
+
+/* Flag used to temporarily pause data consumption from testpoints. */
+extern int data_consumption_paused;
+
 /*
  * Init consumer data structures.
  */
@@ -632,6 +673,14 @@ void lttng_consumer_cleanup(void);
  */
 int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll);
 
+/*
+ * Copy the fields from the channel that need to be accessed (read-only)
+ * directly from the stream.
+ */
+void consumer_stream_update_channel_attributes(
+               struct lttng_consumer_stream *stream,
+               struct lttng_consumer_channel *channel);
+
 struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key,
                uint64_t stream_key,
                enum lttng_consumer_stream_state state,
@@ -710,7 +759,7 @@ int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx,
 ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream,
                struct lttng_consumer_local_data *ctx);
 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream);
-int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
+void consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type,
                struct lttng_consumer_local_data *ctx, int sock,
                struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock,
                uint64_t sessiond_id, uint64_t relayd_session_id);
@@ -726,10 +775,14 @@ void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd);
 unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos,
                unsigned long produced_pos, uint64_t nb_packets_per_stream,
                uint64_t max_sb_size);
-int consumer_add_data_stream(struct lttng_consumer_stream *stream);
+void consumer_add_data_stream(struct lttng_consumer_stream *stream);
 void consumer_del_stream_for_data(struct lttng_consumer_stream *stream);
-int consumer_add_metadata_stream(struct lttng_consumer_stream *stream);
+void consumer_add_metadata_stream(struct lttng_consumer_stream *stream);
 void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream);
 int consumer_create_index_file(struct lttng_consumer_stream *stream);
+int lttng_consumer_rotate_rename(const char *current_path, const char *new_path,
+               uid_t uid, gid_t gid, uint64_t relayd_id);
+int lttng_consumer_mkdir(const char *path, uid_t uid, gid_t gid,
+               uint64_t relayd_id);
 
 #endif /* LIB_CONSUMER_H */