X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=ltt%2Fbranches%2Fpoly%2Finclude%2Fltt%2Fevent.h;h=96c71ce7b49865cbd1d1599eb4c7cddce1fc2f94;hb=e969fd8ead1ce0d34c839d8598a24f3af768d42e;hp=b8ffea10ebe669aaefe1375fbde329a1239fcd96;hpb=290dfc8c6f0882260a7a1c39b87873016d678d0b;p=lttv.git

diff --git a/ltt/branches/poly/include/ltt/event.h b/ltt/branches/poly/include/ltt/event.h
index b8ffea10..96c71ce7 100644
--- a/ltt/branches/poly/include/ltt/event.h
+++ b/ltt/branches/poly/include/ltt/event.h
@@ -45,9 +45,9 @@ unsigned ltt_event_cpu_id(LttEvent *e);
 void *ltt_event_data(LttEvent *e);
 
 
-/* The number of elements in a sequence field is specific to each event.
-   This function returns the number of elements for an array or sequence
-   field in an event. */
+/* The number of elements in a sequence field is specific to each event 
+   instance. This function returns the number of elements for an array or 
+   sequence field in an event. */
 
 unsigned ltt_event_field_element_number(LttEvent *e, LttField *f);
 
@@ -57,6 +57,13 @@ unsigned ltt_event_field_element_number(LttEvent *e, LttField *f);
 void ltt_event_field_element_select(LttEvent *e, LttField *f, unsigned i);
 
 
+/* A union is like a structure except that only a single member at a time
+   is present depending on the specific event instance. This function tells
+   the active member for a union field in an event. */
+
+unsigned ltt_event_field_union_member(LttEvent *e, LttField *f);
+
+
 /* These functions extract data from an event after architecture specific
    conversions. */