new LttEventPosition structure for backword seeking

[lttv.git] / ltt / branches / poly / include / ltt / ltt.h

diff --git a/ltt/branches/poly/include/ltt/ltt.h b/ltt/branches/poly/include/ltt/ltt.h
index d177e946d331e6b61c552efd230eb0f8e06df912..296c82218b3462e27fd6407c80f29aee464ab997 100644 (file)
--- a/ltt/branches/poly/include/ltt/ltt.h
+++ b/ltt/branches/poly/include/ltt/ltt.h
@@ -82,6 +82,11 @@ typedef struct _LttTime {
 
 typedef uint64_t LttCycleCount;
 
+/* Event positions are used to seek within a tracefile based on
+   the block number and event position within the block. */
+
+typedef struct _LttEventPosition LttEventPosition;
+
 
 /* Differences between architectures include word sizes, endianess,
    alignment, floating point format and calling conventions. For a
@@ -124,6 +129,23 @@ do \
     }\
 } while(0)
 
+/*  (T2 = T1 * FLOAT) */
+/* WARNING : use this multiplicator carefully : on 32 bits, multiplying
+ * by more than 4 could overflow the tv_nsec.
+ */
+#define TimeMul(T2, T1, FLOAT) \
+do \
+{\
+  (T2).tv_sec  = (T1).tv_sec  * (FLOAT);  \
+  (T2).tv_nsec = (T1).tv_nsec * (FLOAT);  \
+  if((T2).tv_nsec >= 1000000000)\
+    {\
+    (T2).tv_sec += (T2).tv_nsec / 1000000000;\
+    (T2).tv_nsec = (T2).tv_nsec % 1000000000;\
+    }\
+} while(0)
+
+
 
 
 #include <ltt/ltt-private.h>