Common consumer functions to read current positions

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

diff --git a/src/common/consumer/consumer.h b/src/common/consumer/consumer.h
index eb2958e20669593ed4c8cb7b199c3c3f3fa06039..8a780e7f835eb49abd721c027e4c6f1dc6df9a54 100644 (file)
--- a/src/common/consumer/consumer.h
+++ b/src/common/consumer/consumer.h
@@ -415,6 +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;
        /*
@@ -662,6 +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,
@@ -725,9 +744,12 @@ ssize_t lttng_consumer_on_read_subbuffer_splice(
                struct lttng_consumer_stream *stream, unsigned long len,
                unsigned long padding,
                struct ctf_packet_index *index);
+int lttng_consumer_sample_snapshot_positions(struct lttng_consumer_stream *stream);
 int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream);
 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream,
                unsigned long *pos);
+int lttng_consumer_get_consumed_snapshot(struct lttng_consumer_stream *stream,
+               unsigned long *pos);
 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream);
 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream);
 void *consumer_thread_metadata_poll(void *data);