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 // 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 #if defined(__WIN32__)
  45     #include <windows.h>
  46 #endif
  47
  48 #include <time.h>
  49 #ifndef __WXMAC__
  50     #include <sys/types.h>      // for time_t
  51 #endif
  52
  53 #if defined(HAVE_GETTIMEOFDAY)
  54     #include <sys/time.h>
  55     #include <unistd.h>
  56 #elif defined(HAVE_FTIME)
  57     #include <sys/timeb.h>
  58 #endif
  59
  60 // ----------------------------------------------------------------------------
  61 // wxWin macros
  62 // ----------------------------------------------------------------------------
  63
  64 IMPLEMENT_DYNAMIC_CLASS(wxTimerEvent, wxEvent)
  65
  66 // ----------------------------------------------------------------------------
  67 // macros
  68 // ----------------------------------------------------------------------------
  69
  70 // on some really old systems gettimeofday() doesn't have the second argument,
  71 // define wxGetTimeOfDay() to hide this difference
  72 #ifdef HAVE_GETTIMEOFDAY
  73     #ifdef WX_GETTIMEOFDAY_NO_TZ
  74         struct timezone;
  75         #define wxGetTimeOfDay(tv, tz)      gettimeofday(tv)
  76     #else
  77         #define wxGetTimeOfDay(tv, tz)      gettimeofday((tv), (tz))
  78     #endif
  79 #endif // HAVE_GETTIMEOFDAY
  80
  81 // ----------------------------------------------------------------------------
  82 // prototypes
  83 // ----------------------------------------------------------------------------
  84
  85 wxLongLong wxGetLocalTimeMillis();
  86
  87 // ============================================================================
  88 // implementation
  89 // ============================================================================
  90
  91 // ----------------------------------------------------------------------------
  92 // wxTimerBase
  93 // ----------------------------------------------------------------------------
  94
  95 void wxTimerBase::Notify()
  96 {
  97     // the base class version generates an event if it has owner - which it
  98     // should because otherwise nobody can process timer events
  99     wxCHECK_RET( m_owner, _T("wxTimer::Notify() should be overridden.") );
 100
 101     wxTimerEvent event(m_idTimer, m_milli);
 102     (void)m_owner->ProcessEvent(event);
 103 }
 104
 105 // ----------------------------------------------------------------------------
 106 // wxStopWatch
 107 // ----------------------------------------------------------------------------
 108
 109 void wxStopWatch::Start(long t)
 110 {
 111     m_t0 = wxGetLocalTimeMillis() - t;
 112
 113     m_pause = 0;
 114 }
 115
 116 inline long wxStopWatch::GetElapsedTime() const
 117 {
 118     return (wxGetLocalTimeMillis() - m_t0).GetLo();
 119 }
 120
 121 long wxStopWatch::Time() const
 122 {
 123     return (m_pause ? m_pause : GetElapsedTime());
 124 }
 125
 126 // ----------------------------------------------------------------------------
 127 // old timer functions superceded by wxStopWatch
 128 // ----------------------------------------------------------------------------
 129
 130 static wxLongLong wxStartTime = 0l;
 131
 132 // starts the global timer
 133 void wxStartTimer()
 134 {
 135     wxStartTime = wxGetLocalTimeMillis();
 136 }
 137
 138 // Returns elapsed time in milliseconds
 139 long wxGetElapsedTime(bool resetTimer)
 140 {
 141     wxLongLong oldTime = wxStartTime;
 142     wxLongLong newTime = wxGetLocalTimeMillis();
 143
 144     if ( resetTimer )
 145         wxStartTime = newTime;
 146
 147     return (newTime - oldTime).GetLo();
 148 }
 149
 150
 151 // ----------------------------------------------------------------------------
 152 // the functions to get the current time and timezone info
 153 // ----------------------------------------------------------------------------
 154
 155 // Get local time as seconds since 00:00:00, Jan 1st 1970
 156 long wxGetLocalTime()
 157 {
 158     struct tm tm;
 159     time_t t0, t1;
 160
 161     // This cannot be made static because mktime can overwrite it.
 162     //
 163     memset(&tm, 0, sizeof(tm));
 164     tm.tm_year  = 70;
 165     tm.tm_mon   = 0;
 166     tm.tm_mday  = 5;        // not Jan 1st 1970 due to mktime 'feature'
 167     tm.tm_hour  = 0;
 168     tm.tm_min   = 0;
 169     tm.tm_sec   = 0;
 170     tm.tm_isdst = -1;       // let mktime guess
 171
 172     // Note that mktime assumes that the struct tm contains local time.
 173     //
 174     t1 = time(&t1);         // now
 175     t0 = mktime(&tm);       // origin
 176
 177     // Return the difference in seconds.
 178     //
 179     if (( t0 != (time_t)-1 ) && ( t1 != (time_t)-1 ))
 180         return (long)difftime(t1, t0) + (60 * 60 * 24 * 4);
 181
 182     wxLogSysError(_("Failed to get the local system time"));
 183     return -1;
 184 }
 185
 186 // Get UTC time as seconds since 00:00:00, Jan 1st 1970
 187 long wxGetUTCTime()
 188 {
 189     struct tm tm, *ptm;
 190     time_t t0, t1;
 191
 192     // This cannot be made static because mktime can overwrite it
 193     //
 194     memset(&tm, 0, sizeof(tm));
 195     tm.tm_year  = 70;
 196     tm.tm_mon   = 0;
 197     tm.tm_mday  = 5;        // not Jan 1st 1970 due to mktime 'feature'
 198     tm.tm_hour  = 0;
 199     tm.tm_min   = 0;
 200     tm.tm_sec   = 0;
 201     tm.tm_isdst = -1;       // let mktime guess
 202
 203     // Note that mktime assumes that the struct tm contains local time.
 204     //
 205     t1 = time(&t1);         // now
 206     t0 = mktime(&tm);       // origin in localtime
 207
 208     if (( t0 != (time_t)-1 ) && ( t1 != (time_t)-1 ))
 209     {
 210         // To get t0 as GMT we convert to a struct tm with gmtime,
 211         // and then back again.
 212         //
 213         ptm = gmtime(&t0);
 214
 215         if (ptm)
 216         {
 217             memcpy(&tm, ptm, sizeof(tm));
 218             t0 = mktime(&tm);
 219
 220             if (t0 != (time_t)-1 )
 221                 return (long)difftime(t1, t0) + (60 * 60 * 24 * 4);
 222             wxLogSysError(_("Failed 2nd mktime"));
 223         }
 224         wxLogSysError(_("Failed gmtime"));
 225     }
 226     wxLogSysError(_("Failed to get the UTC system time"));
 227     return -1;
 228 }
 229
 230
 231 // Get local time as milliseconds since 00:00:00, Jan 1st 1970
 232 wxLongLong wxGetLocalTimeMillis()
 233 {
 234     // We use wxGetLocalTime() to get the seconds since
 235     // 00:00:00 Jan 1st 1970 and then whatever is available
 236     // to get millisecond resolution.
 237     //
 238     wxLongLong val = 1000l;
 239     val *= wxGetLocalTime();
 240
 241     // If we got here, do not fail even if we can't get
 242     // millisecond resolution.
 243     //
 244 #if defined(__WIN32__)
 245     SYSTEMTIME st;
 246     ::GetLocalTime(&st);
 247     return (val + st.wMilliseconds);
 248 #elif defined(HAVE_GETTIMEOFDAY)
 249     struct timeval tp;
 250     if ( wxGetTimeOfDay(&tp, (struct timezone *)NULL) != -1 )
 251     {
 252         return (val + (tp.tv_usec / 1000));
 253     }
 254 #elif defined(HAVE_FTIME)
 255     struct timeb tp;
 256     if ( ftime(&tp) == 0 )
 257     {
 258         return (val + tp.millitm);
 259     }
 260 #else
 261 #ifndef __BORLANDC__
 262     #warning "wxStopWatch will be up to second resolution!"
 263 #endif
 264 #endif
 265
 266     return val;
 267 }