X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=ltt%2Fbranches%2Fpoly%2Finclude%2Fltt%2Fevent.h;h=7c231ccc2312f28d960545120ea59bc2c57e3174;hb=a5dcde2f975b43a9c6069c4a346528588bf1f8c8;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..7c231ccc 100644
--- a/ltt/branches/poly/include/ltt/event.h
+++ b/ltt/branches/poly/include/ltt/event.h
@@ -34,6 +34,24 @@ LttTime ltt_event_time(LttEvent *e);
 LttCycleCount ltt_event_cycle_count(LttEvent *e);
 
 
+/* Obtain the position of the event within the tracefile. This
+   is used to seek back to this position later or to seek to another
+   position, computed relative to this position. The event position
+   structure is opaque and contains several fields, only two
+   of which are user accessible: block number and event index
+   within the block. */
+
+void ltt_event_position(LttEvent *e, LttEventPosition *ep);
+
+LttEventPosition * ltt_event_position_new();
+
+void ltt_event_position_get(LttEventPosition *ep,
+    unsigned *block_number, unsigned *index_in_block, LttTracefile ** tf);
+
+void ltt_event_position_set(LttEventPosition *ep,
+    unsigned block_number, unsigned index_in_block);
+
+
 /* CPU id of the event */
 
 unsigned ltt_event_cpu_id(LttEvent *e);
@@ -45,9 +63,9 @@ 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 +75,13 @@ 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. */