Fix: race with the viewer and readiness of streams

[lttng-tools.git] / src / bin / lttng-relayd / lttng-relayd.h

diff --git a/src/bin/lttng-relayd/lttng-relayd.h b/src/bin/lttng-relayd/lttng-relayd.h
index bb5b7a365aaae214a10bd3757e34f1074ce4e81f..d0e0473b2bb8ed5e7ec355da6666e808b5e93ff7 100644 (file)
--- a/src/bin/lttng-relayd/lttng-relayd.h
+++ b/src/bin/lttng-relayd/lttng-relayd.h
@@ -23,6 +23,7 @@
 #include <limits.h>
 #include <urcu.h>
 #include <urcu/wfqueue.h>
+#include <urcu/list.h>
 
 #include <common/hashtable/hashtable.h>
 #include <common/index/ctf-index.h>
@@ -44,6 +45,16 @@ enum connection_type {
        RELAY_VIEWER_NOTIFICATION   = 4,
 };
 
+/*
+ * When we receive a stream, it gets stored in a list (on a per connection
+ * basis) until we have all the streams of the same channel and the metadata
+ * associated with it, then it gets flagged with viewer_ready.
+ */
+struct relay_stream_recv_handle {
+       uint64_t id;    /* stream handle */
+       struct cds_list_head node;
+};
+
 /*
  * Represents a session for the relay point of view
  */
@@ -144,6 +155,11 @@ struct relay_stream {
         * update the oldest_tracefile_id.
         */
        unsigned int tracefile_overwrite:1;
+       /*
+        * Can this stream be used by a viewer or are we waiting for additional
+        * information.
+        */
+       unsigned int viewer_ready:1;
 };
 
 /*
@@ -200,12 +216,13 @@ struct relay_command {
        struct lttng_ht_node_ulong sock_n;
        struct rcu_head rcu_node;
        enum connection_type type;
-       unsigned int version_check_done:1;
        /* protocol version to use for this session */
        uint32_t major;
        uint32_t minor;
        struct lttng_ht *ctf_traces_ht; /* indexed by path name */
        uint64_t session_id;
+       struct cds_list_head recv_head;
+       unsigned int version_check_done:1;
 };
 
 struct relay_local_data {