ltt/branches/poly/include/ltt/time.h

   1 #ifndef LTT_TIME_H
   2 #define LTT_TIME_H
   3
   4
   5 typedef struct _LttTime {
   6   unsigned long tv_sec;
   7   unsigned long tv_nsec;
   8 } LttTime;
   9
  10
  11 static const unsigned long NANOSECONDS_PER_SECOND = 1000000000;
  12
  13 static const LttTime ltt_time_zero = { 0, 0};
  14
  15
  16 static inline LttTime ltt_time_sub(LttTime t1, LttTime t2)
  17 {
  18   LttTime res;
  19   res.tv_sec  = t1.tv_sec  - t2.tv_sec;
  20   if(t1.tv_nsec < t2.tv_nsec) {
  21     res.tv_sec--;
  22     res.tv_nsec = NANOSECONDS_PER_SECOND + t1.tv_nsec - t2.tv_nsec;
  23   }
  24   else {
  25     res.tv_nsec = t1.tv_nsec - t2.tv_nsec;
  26   }
  27   return res;
  28 }
  29
  30
  31 static inline LttTime ltt_time_add(LttTime t1, LttTime t2)
  32 {
  33   LttTime res;
  34   res.tv_sec  = t1.tv_sec  + t2.tv_sec;
  35   res.tv_nsec = t1.tv_nsec + t2.tv_nsec;
  36   if(res.tv_nsec >= NANOSECONDS_PER_SECOND) {
  37     res.tv_sec++;
  38     res.tv_nsec -= NANOSECONDS_PER_SECOND;
  39   }
  40   return res;
  41 }
  42
  43
  44 static inline LttTime ltt_time_mul(LttTime t1, float f)
  45 {
  46   double nsec;
  47   LttTime res;
  48
  49   nsec = (double)t1.tv_nsec * f;
  50   res.tv_sec = nsec / NANOSECONDS_PER_SECOND;
  51   res.tv_nsec = nsec - res.tv_sec * NANOSECONDS_PER_SECOND;
  52   res.tv_sec += t1.tv_sec * f;
  53   return res;
  54 }
  55
  56
  57 static inline LttTime ltt_time_div(LttTime t1, float f)
  58 {
  59   double sec;
  60   LttTime res;
  61
  62   sec = t1.tv_sec / (double)f;
  63   res.tv_sec = sec;
  64   res.tv_nsec = t1.tv_nsec / (double)f + (sec - res.tv_sec) *
  65       NANOSECONDS_PER_SECOND;
  66   return res;
  67 }
  68
  69
  70 static inline int ltt_time_compare(LttTime t1, LttTime t2)
  71 {
  72   if(t1.tv_sec > t2.tv_sec) return 1;
  73   if(t1.tv_sec < t2.tv_sec) return -1;
  74   if(t1.tv_nsec > t2.tv_nsec) return 1;
  75   if(t1.tv_nsec < t2.tv_nsec) return -1;
  76   return 0;
  77 }
  78
  79
  80 static inline double ltt_time_to_double(LttTime t1)
  81 {
  82   return (double)t1.tv_sec + (double)t1.tv_nsec / NANOSECONDS_PER_SECOND;
  83 }
  84
  85
  86 static inline LttTime ltt_time_from_double(double t1)
  87 {
  88   LttTime res;
  89   res.tv_sec = t1;
  90   res.tv_nsec = (t1 - res.tv_sec) * NANOSECONDS_PER_SECOND;
  91   return res;
  92 }
  93
  94 #endif // LTT_TIME_H