Implement consumer ring buffer position sampling

[lttng-tools.git] / src / common / kernel-consumer / kernel-consumer.c

diff --git a/src/common/kernel-consumer/kernel-consumer.c b/src/common/kernel-consumer/kernel-consumer.c
index 1a786352d75adbfaedf93783ab4d9b91f559c0d2..3554b8f05ec98fe5ddfeb0c7969552f778efdf69 100644 (file)
--- a/src/common/kernel-consumer/kernel-consumer.c
+++ b/src/common/kernel-consumer/kernel-consumer.c
@@ -68,6 +68,19 @@ int lttng_kconsumer_take_snapshot(struct lttng_consumer_stream *stream)
        return ret;
 }
 
+/*
+ * Sample consumed and produced positions for a specific fd.
+ *
+ * Returns 0 on success, < 0 on error.
+ */
+int lttng_kconsumer_sample_snapshot_positions(
+               struct lttng_consumer_stream *stream)
+{
+       assert(stream);
+
+       return kernctl_snapshot_sample_positions(stream->wait_fd);
+}
+
 /*
  * Get the produced position
  *
@@ -534,9 +547,20 @@ int lttng_kconsumer_recv_cmd(struct lttng_consumer_local_data *ctx,
                } else {
                        ret = consumer_add_channel(new_channel, ctx);
                }
-               if (CONSUMER_CHANNEL_TYPE_DATA) {
+               if (msg.u.channel.type == CONSUMER_CHANNEL_TYPE_DATA && !ret) {
+                       int monitor_start_ret;
+
+                       DBG("Consumer starting monitor timer");
                        consumer_timer_live_start(new_channel,
                                        msg.u.channel.live_timer_interval);
+                       monitor_start_ret = consumer_timer_monitor_start(
+                                       new_channel,
+                                       msg.u.channel.monitor_timer_interval);
+                       if (monitor_start_ret < 0) {
+                               ERR("Starting channel monitoring timer failed");
+                               goto end_nosignal;
+                       }
+
                }
 
                health_code_update();