Resolve "Add origin timestamp to events"

Closes #78 (closed)

include/maestro/core.h

@@ -111,6 +111,19 @@ extern "C" {
   /** the number of characters needed to print an @ref mstro_app_id value using @ref PRIappid */
   #define MSTRO_APP_ID_STR_LEN (21) // decimal, no sign, no NUL
 
+  /** type to express nanosecond time points (since an arbitrary point in time) */
+  typedef uint64_t mstro_nanosec_t;
+
+  /** Printing support */
+  #define PRInanosec PRIu64
+  
+  /** Return the current time */
+  mstro_nanosec_t
+  mstro_clock(void);
+  
+  /** nsec-per-seconds multiplier */
+  #define NSEC_PER_SEC ((mstro_nanosec_t)1000*1000*1000)
+  
 
   /**@} (end of group MSTRO_Core) */