timeinfo.c

   1 #include <assert.h>
   2 #include <ctype.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <math.h>
   6 #include <time.h>
   7
   8 #define DEBUG
   9
  10 #include "debug.h"
  11 #include "timeinfo.h"
  12
  13
  14 bool
  15 time_parse(struct time_info *ti, char *s)
  16 {
  17         switch (s[0]) {
  18                 case '_': ti->period = TT_TOTAL; s++; break;
  19                 default: ti->period = TT_MOVE; break;
  20         }
  21         switch (s[0]) {
  22                 case '=':
  23                         ti->dim = TD_GAMES;
  24                         ti->len.games = atoi(++s);
  25                         break;
  26                 default:
  27                         if (!isdigit(s[0]))
  28                                 return false;
  29                         ti->dim = TD_WALLTIME;
  30                         ti->len.t.recommended_time = atof(s);
  31                         break;
  32         }
  33         return true;
  34 }
  35
  36 /* Set correct time information before making a move, and
  37  * always make it time per move for the engine. */
  38 void
  39 time_prepare_move(struct time_info *ti, struct board *board)
  40 {
  41         int moves_left;
  42
  43         if (ti->period == TT_TOTAL) {
  44                 moves_left = board_estimated_moves_left(board);
  45                 assert(moves_left > 0);
  46                 if (ti->dim == TD_GAMES) {
  47                         ti->period = TT_MOVE;
  48                         ti->len.games /= moves_left;
  49                 }
  50         }
  51         if (ti->period == TT_NULL || ti->dim != TD_WALLTIME)
  52                 return;
  53
  54         double now = time_now();
  55         if (!ti->len.t.timer_start) {
  56                 ti->len.t.timer_start = now; // we're playing the first game move
  57         }
  58         if (ti->period == TT_TOTAL) {
  59                 ti->period = TT_MOVE;
  60                 ti->len.t.recommended_time /= moves_left;
  61         }
  62 }
  63
  64 /* Start our timer. kgs does this (correctly) on "play" not "genmove"
  65  * unless we are making the first move of the game. */
  66 void
  67 time_start_timer(struct time_info *ti)
  68 {
  69         if (ti->period != TT_NULL && ti->dim == TD_WALLTIME)
  70                 ti->len.t.timer_start = time_now();
  71 }
  72
  73 /* Returns the current time. */
  74 double
  75 time_now(void)
  76 {
  77         struct timespec now;
  78         clock_gettime(CLOCK_REALTIME, &now);
  79         return now.tv_sec + now.tv_nsec/1000000000.0;
  80 }
  81
  82 /* Sleep for a given interval (in seconds). Return immediately if interval < 0. */
  83 void
  84 time_sleep(double interval)
  85 {
  86         struct timespec ts;
  87         double sec;
  88         ts.tv_nsec = (int)(modf(interval, &sec)*1000000000.0);
  89         ts.tv_sec = (int)sec;
  90         nanosleep(&ts, NULL); /* ignore error if interval was < 0 */
  91 }