lib: validate monotonicity of messages from upstream component

[babeltrace.git] / src / lib / graph / message / iterator.h

diff --git a/src/lib/graph/message/iterator.h b/src/lib/graph/message/iterator.h
index a174f3e9c17f99c4fb879c7db4c067c314250f5a..36795bd083baa4e7902ada7a788d87604e37a3c7 100644 (file)
--- a/src/lib/graph/message/iterator.h
+++ b/src/lib/graph/message/iterator.h
@@ -32,6 +32,7 @@
 #include <babeltrace2/types.h>
 #include "common/assert.h"
 #include <stdbool.h>
+#include <compat/uuid.h>
 
 struct bt_port;
 struct bt_graph;
@@ -113,6 +114,40 @@ struct bt_self_component_port_input_message_iterator {
 
        enum bt_self_component_port_input_message_iterator_state state;
 
+       /*
+        * Timestamp of the last received message (or INT64_MIN in the
+        * beginning, or after a seek to beginning).
+        */
+       int64_t last_ns_from_origin;
+
+       struct {
+               enum {
+                       /* We haven't recorded clock properties yet. */
+                       CLOCK_EXPECTATION_UNSET,
+
+                       /* Expect to have no clock. */
+                       CLOCK_EXPECTATION_NONE,
+
+                       /* Clock with origin_is_unix_epoch true.*/
+                       CLOCK_EXPECTATION_ORIGIN_UNIX,
+
+                       /* Clock with origin_is_unix_epoch false, with a UUID.*/
+                       CLOCK_EXPECTATION_ORIGIN_OTHER_UUID,
+
+                       /* Clock with origin_is_unix_epoch false, without a UUID.*/
+                       CLOCK_EXPECTATION_ORIGIN_OTHER_NO_UUID,
+               } type;
+
+               /*
+                * Expected UUID of the clock, if `type`is CLOCK_EXPECTATION_ORIGIN_OTHER_UUID.
+                *
+                * If the clock's origin is the unix epoch, the UUID is
+                * irrelevant (as the clock will be correlatable with other
+                * clocks having the same origin).
+                */
+               uint8_t uuid[BABELTRACE_UUID_LEN];
+       } clock_expectation;
+
        /*
         * Data necessary for auto seek (the seek-to-beginning then fast-forward
         * seek strategy).