Implement consumer ring buffer position sampling
[lttng-tools.git] / src / common / ust-consumer / ust-consumer.c
index 7006e1cb435fb47a4b628e863d24aa338d1728ae..147fe8aafe899a092a91ee8be58357786d7f074f 100644 (file)
@@ -1502,8 +1502,17 @@ int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                        consumer_timer_switch_start(channel, attr.switch_timer_interval);
                        attr.switch_timer_interval = 0;
                } else {
+                       int monitor_start_ret;
+
                        consumer_timer_live_start(channel,
                                        msg.u.ask_channel.live_timer_interval);
+                       monitor_start_ret = consumer_timer_monitor_start(
+                                       channel,
+                                       msg.u.ask_channel.monitor_timer_interval);
+                       if (monitor_start_ret < 0) {
+                               ERR("Starting channel monitoring timer failed");
+                               goto end_channel_error;
+                       }
                }
 
                health_code_update();
@@ -1526,6 +1535,9 @@ int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                        if (channel->live_timer_enabled == 1) {
                                consumer_timer_live_stop(channel);
                        }
+                       if (channel->monitor_timer_enabled == 1) {
+                               consumer_timer_monitor_stop(channel);
+                       }
                        goto end_channel_error;
                }
 
@@ -1984,7 +1996,7 @@ void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream)
 }
 
 /*
- * Take a snapshot for a specific fd
+ * Take a snapshot for a specific stream.
  *
  * Returns 0 on success, < 0 on error
  */
@@ -1996,6 +2008,20 @@ int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream)
        return ustctl_snapshot(stream->ustream);
 }
 
+/*
+ * Sample consumed and produced positions for a specific stream.
+ *
+ * Returns 0 on success, < 0 on error.
+ */
+int lttng_ustconsumer_sample_snapshot_positions(
+               struct lttng_consumer_stream *stream)
+{
+       assert(stream);
+       assert(stream->ustream);
+
+       return ustctl_snapshot_sample_positions(stream->ustream);
+}
+
 /*
  * Get the produced position
  *
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