utils/wvtimeutils.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2002 Net Integration Technologies, Inc.
   4  *
   5  * Various little time functions...
   6  */
   7 #include "wvtimeutils.h"
   8 #include <limits.h>
   9 #ifndef _MSC_VER
  10 #include <unistd.h>
  11 #include <utime.h>
  12 #endif
  13
  14 time_t msecdiff(const WvTime &a, const WvTime &b)
  15 {
  16     long long secdiff = a.tv_sec - b.tv_sec;
  17     long long usecdiff = a.tv_usec - b.tv_usec;
  18     long long msecs = secdiff * 1000 + usecdiff / 1000;
  19
  20     time_t rval;
  21     if (msecs > INT_MAX)
  22         rval = INT_MAX;
  23     else if (msecs < INT_MIN)
  24         rval = INT_MIN;
  25     else
  26         rval = msecs;
  27     return rval;
  28 }
  29
  30
  31 WvTime wvtime()
  32 {
  33     struct timeval tv;
  34     gettimeofday(&tv, 0);
  35     return tv;
  36 }
  37
  38
  39 WvTime msecadd(const WvTime &a, time_t msec)
  40 {
  41     WvTime b;
  42     b.tv_sec = a.tv_sec + msec / 1000;
  43     b.tv_usec = a.tv_usec + (msec % 1000) * 1000;
  44     normalize(b);
  45     return b;
  46 }
  47
  48
  49 WvTime tvdiff(const WvTime &a, const WvTime &b)
  50 {
  51     WvTime c;
  52     c.tv_sec = a.tv_sec - b.tv_sec;
  53     c.tv_usec = a.tv_usec;
  54
  55     if (b.tv_usec > a.tv_usec)
  56     {
  57         c.tv_sec--;
  58         c.tv_usec += 1000000;
  59     }
  60
  61     c.tv_usec -= b.tv_usec;
  62
  63     normalize(c);
  64     return c;
  65 }
  66
  67
  68 static WvTime wvstime_cur = wvtime();
  69
  70
  71 const WvTime &wvstime()
  72 {
  73     return wvstime_cur;
  74 }
  75
  76
  77 static void do_wvstime_sync(bool forward_only)
  78 {
  79     if (!forward_only)
  80     {
  81         wvstime_cur = wvtime();
  82     }
  83     else
  84     {
  85         WvTime now = wvtime();
  86         if (wvstime_cur < now)
  87             wvstime_cur = now;
  88     }
  89 }
  90
  91
  92 void wvstime_sync()
  93 {
  94     do_wvstime_sync(false);
  95 }
  96
  97
  98 void wvstime_sync_forward()
  99 {
 100     do_wvstime_sync(true);
 101 }
 102
 103
 104 void wvstime_set(const WvTime &_new_time)
 105 {
 106     wvstime_cur = _new_time;
 107 }
 108
 109
 110 void wvdelay(int msec_delay)
 111 {
 112 #ifdef _WIN32
 113     Sleep(msec_delay);
 114 #else
 115     usleep(msec_delay * 1000);
 116 #endif
 117 }