Fix: UST should not generate packet at destroy after stop

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

diff --git a/src/common/consumer.h b/src/common/consumer.h
index e50835e019f27176143ba857a572b52415c919f4..0f89d8eedc81dccc6548e12970b5a91b21dc5781 100644 (file)
--- a/src/common/consumer.h
+++ b/src/common/consumer.h
@@ -58,6 +58,7 @@ enum lttng_consumer_command {
        LTTNG_CONSUMER_SNAPSHOT_CHANNEL,
        LTTNG_CONSUMER_SNAPSHOT_METADATA,
        LTTNG_CONSUMER_STREAMS_SENT,
+       LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL,
 };
 
 /* State of each fd in consumer */
@@ -238,6 +239,25 @@ struct lttng_consumer_stream {
        int data_read;
        int hangup_flush_done;
 
+       /*
+        * Whether the stream is in a "complete" state (e.g. it does not have a
+        * partially written sub-buffer.
+        *
+        * Initialized to "false" on stream creation (first packet is empty).
+        *
+        * The various transitions of the quiescent state are:
+        *     - On "start" tracing: set to false, since the stream is not
+        *       "complete".
+        *     - On "stop" tracing: if !quiescent -> flush FINAL (update
+        *       timestamp_end), and set to true; the stream has entered a
+        *       complete/quiescent state.
+        *     - On "destroy" or stream/application hang-up: if !quiescent ->
+        *       flush FINAL, and set to true.
+        *
+        * NOTE: Update and read are protected by the stream lock.
+        */
+       bool quiescent;
+
        /*
         * metadata_timer_lock protects flags waiting_on_metadata and
         * missed_metadata_flush.