src/common/timercmn.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        common/timercmn.cpp
   3 // Purpose:     Common timer implementation
   4 // Author:
   5 //    Original version by Julian Smart
   6 //    Vadim Zeitlin got rid of all ifdefs (11.12.99)
   7 //    Sylvain Bougnoux added wxStopWatch class
   8 //    Guillermo Rodriguez <guille@iies.es> rewrote from scratch (Dic/99)
   9 // Modified by:
  10 // Created:     04/01/98
  11 // RCS-ID:      $Id$
  12 // Copyright:   (c) Julian Smart and Markus Holzem
  13 //              (c) 1999 Guillermo Rodriguez <guille@iies.es>
  14 // Licence:     wxWindows license
  15 /////////////////////////////////////////////////////////////////////////////
  16
  17 // ============================================================================
  18 // declarations
  19 // ============================================================================
  20
  21 // ----------------------------------------------------------------------------
  22 // wxWin headers
  23 // ----------------------------------------------------------------------------
  24
  25 #ifdef __GNUG__
  26     #pragma implementation "timerbase.h"
  27 #endif
  28
  29 // For compilers that support precompilation, includes "wx.h".
  30 #include "wx/wxprec.h"
  31
  32 #ifdef __BORLANDC__
  33     #pragma hdrstop
  34 #endif
  35
  36 #ifndef WX_PRECOMP
  37     #include "wx/intl.h"
  38     #include "wx/log.h"
  39 #endif
  40
  41 #include "wx/timer.h"
  42 #include "wx/longlong.h"
  43
  44 // ----------------------------------------------------------------------------
  45 // System headers
  46 // ----------------------------------------------------------------------------
  47
  48 #if defined(__WIN32__)
  49     #include <windows.h>
  50 #endif
  51
  52 #if defined(__WIN32__) && !defined(HAVE_FTIME)
  53     #define HAVE_FTIME
  54 #endif
  55
  56 #include <time.h>
  57 #ifndef __WXMAC__
  58     #include <sys/types.h>      // for time_t
  59 #endif
  60
  61 #if defined(HAVE_GETTIMEOFDAY)
  62     #include <sys/time.h>
  63     #include <unistd.h>
  64 #elif defined(HAVE_FTIME)
  65     #include <sys/timeb.h>
  66 #endif
  67
  68 // ----------------------------------------------------------------------------
  69 // wxWin macros
  70 // ----------------------------------------------------------------------------
  71
  72 #if wxUSE_GUI
  73     IMPLEMENT_DYNAMIC_CLASS(wxTimerEvent, wxEvent)
  74 #endif // wxUSE_GUI
  75
  76 // ----------------------------------------------------------------------------
  77 // macros
  78 // ----------------------------------------------------------------------------
  79
  80 // on some really old systems gettimeofday() doesn't have the second argument,
  81 // define wxGetTimeOfDay() to hide this difference
  82 #ifdef HAVE_GETTIMEOFDAY
  83     #ifdef WX_GETTIMEOFDAY_NO_TZ
  84         struct timezone;
  85         #define wxGetTimeOfDay(tv, tz)      gettimeofday(tv)
  86     #else
  87         #define wxGetTimeOfDay(tv, tz)      gettimeofday((tv), (tz))
  88     #endif
  89 #endif // HAVE_GETTIMEOFDAY
  90
  91 // ----------------------------------------------------------------------------
  92 // prototypes
  93 // ----------------------------------------------------------------------------
  94
  95 wxLongLong wxGetLocalTimeMillis();
  96
  97 // ============================================================================
  98 // implementation
  99 // ============================================================================
 100
 101 // ----------------------------------------------------------------------------
 102 // wxTimerBase
 103 // ----------------------------------------------------------------------------
 104
 105 #if wxUSE_GUI
 106
 107 void wxTimerBase::Notify()
 108 {
 109     // the base class version generates an event if it has owner - which it
 110     // should because otherwise nobody can process timer events
 111     wxCHECK_RET( m_owner, _T("wxTimer::Notify() should be overridden.") );
 112
 113     wxTimerEvent event(m_idTimer, m_milli);
 114     (void)m_owner->ProcessEvent(event);
 115 }
 116
 117 #endif // wxUSE_GUI
 118
 119 // ----------------------------------------------------------------------------
 120 // wxStopWatch
 121 // ----------------------------------------------------------------------------
 122
 123 void wxStopWatch::Start(long t)
 124 {
 125     m_t0 = wxGetLocalTimeMillis() - t;
 126     m_pause = 0;
 127 }
 128
 129 long wxStopWatch::GetElapsedTime() const
 130 {
 131   return (wxGetLocalTimeMillis() - m_t0).GetLo();
 132 }
 133
 134 long wxStopWatch::Time() const
 135 {
 136     return (m_pause ? m_pause : GetElapsedTime());
 137 }
 138
 139 // ----------------------------------------------------------------------------
 140 // old timer functions superceded by wxStopWatch
 141 // ----------------------------------------------------------------------------
 142
 143 static wxLongLong wxStartTime = 0l;
 144
 145 // starts the global timer
 146 void wxStartTimer()
 147 {
 148     wxStartTime = wxGetLocalTimeMillis();
 149 }
 150
 151 // Returns elapsed time in milliseconds
 152 long wxGetElapsedTime(bool resetTimer)
 153 {
 154     wxLongLong oldTime = wxStartTime;
 155     wxLongLong newTime = wxGetLocalTimeMillis();
 156
 157     if ( resetTimer )
 158         wxStartTime = newTime;
 159
 160     return (newTime - oldTime).GetLo();
 161 }
 162
 163
 164 // ----------------------------------------------------------------------------
 165 // the functions to get the current time and timezone info
 166 // ----------------------------------------------------------------------------
 167
 168 // Get local time as seconds since 00:00:00, Jan 1st 1970
 169 long wxGetLocalTime()
 170 {
 171     struct tm tm;
 172     time_t t0, t1;
 173
 174     // This cannot be made static because mktime can overwrite it.
 175     //
 176     memset(&tm, 0, sizeof(tm));
 177     tm.tm_year  = 70;
 178     tm.tm_mon   = 0;
 179     tm.tm_mday  = 5;        // not Jan 1st 1970 due to mktime 'feature'
 180     tm.tm_hour  = 0;
 181     tm.tm_min   = 0;
 182     tm.tm_sec   = 0;
 183     tm.tm_isdst = -1;       // let mktime guess
 184
 185     // Note that mktime assumes that the struct tm contains local time.
 186     //
 187     t1 = time(&t1);         // now
 188     t0 = mktime(&tm);       // origin
 189
 190     // Return the difference in seconds.
 191     //
 192     if (( t0 != (time_t)-1 ) && ( t1 != (time_t)-1 ))
 193         return (long)difftime(t1, t0) + (60 * 60 * 24 * 4);
 194
 195     wxLogSysError(_("Failed to get the local system time"));
 196     return -1;
 197 }
 198
 199 // Get UTC time as seconds since 00:00:00, Jan 1st 1970
 200 long wxGetUTCTime()
 201 {
 202     struct tm tm, *ptm;
 203     time_t t0, t1;
 204
 205     // This cannot be made static because mktime can overwrite it
 206     //
 207     memset(&tm, 0, sizeof(tm));
 208     tm.tm_year  = 70;
 209     tm.tm_mon   = 0;
 210     tm.tm_mday  = 5;        // not Jan 1st 1970 due to mktime 'feature'
 211     tm.tm_hour  = 0;
 212     tm.tm_min   = 0;
 213     tm.tm_sec   = 0;
 214     tm.tm_isdst = -1;       // let mktime guess
 215
 216     // Note that mktime assumes that the struct tm contains local time.
 217     //
 218     t1 = time(&t1);         // now
 219     t0 = mktime(&tm);       // origin in localtime
 220
 221     if (( t0 != (time_t)-1 ) && ( t1 != (time_t)-1 ))
 222     {
 223         // To get t0 as GMT we convert to a struct tm with gmtime,
 224         // and then back again.
 225         //
 226         ptm = gmtime(&t0);
 227
 228         if (ptm)
 229         {
 230             memcpy(&tm, ptm, sizeof(tm));
 231             t0 = mktime(&tm);
 232
 233             if (t0 != (time_t)-1 )
 234                 return (long)difftime(t1, t0) + (60 * 60 * 24 * 4);
 235             wxLogSysError(_("mktime() failed"));
 236         }
 237         else
 238         {
 239             wxLogSysError(_("gmtime() failed"));
 240         }
 241     }
 242
 243     wxLogError(_("Failed to get the UTC system time."));
 244
 245     return -1;
 246 }
 247
 248
 249 // Get local time as milliseconds since 00:00:00, Jan 1st 1970
 250 wxLongLong wxGetLocalTimeMillis()
 251 {
 252     wxLongLong val = 1000l;
 253
 254     // If possible, use a functin which avoids conversions from
 255     // broken-up time structures to milliseconds,
 256
 257 #if defined(HAVE_GETTIMEOFDAY)
 258     struct timeval tp;
 259     if ( wxGetTimeOfDay(&tp, (struct timezone *)NULL) != -1 )
 260     {
 261         val *= tp.tv_sec;
 262         return (val + (tp.tv_usec / 1000));
 263     }
 264     else
 265     {
 266         wxLogError(_("wxGetTimeOfDay failed."));
 267         return 0;
 268     }
 269 #elif defined(HAVE_FTIME)
 270     struct timeb tp;
 271
 272     // ftime() is void and not int in some mingw32 headers, so don't
 273     // test the return code (well, it shouldn't fail anyhow...)
 274     (void)ftime(&tp);
 275     val *= tp.time;
 276     return (val + tp.millitm);
 277 #else
 278     // We use wxGetLocalTime() to get the seconds since
 279     // 00:00:00 Jan 1st 1970 and then whatever is available
 280     // to get millisecond resolution.
 281     //
 282     // NOTE that this might lead to a problem if the clocks
 283     // use different sources, so this approach should be
 284     // avoided where possible.
 285
 286     val *= wxGetLocalTime();
 287
 288 #if defined(__VISAGECPP__)
 289     DATETIME dt;
 290     ::DosGetDateTime(&dt);
 291     val += (dt.hundredths*10);
 292 #elif defined (__WIN32__)
 293 #warning "Possible clock skew bug in wxStopWatch!"
 294     SYSTEMTIME st;
 295     ::GetLocalTime(&st);
 296     val += st.wMilliseconds;
 297 #else
 298 #ifndef __VISUALC__
 299 #warning "wxStopWatch will be up to second resolution!"
 300 #endif
 301 #endif
 302
 303     return val;
 304
 305 #endif
 306 }