wtf/CurrentTime.h

   1 /*
   2  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
   3  * Copyright (C) 2008 Google Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #ifndef CurrentTime_h
  33 #define CurrentTime_h
  34
  35 #include <time.h>
  36
  37 namespace WTF {
  38
  39     // Returns the current UTC time in seconds, counted from January 1, 1970.
  40     // Precision varies depending on platform but is usually as good or better
  41     // than a millisecond.
  42     double currentTime();
  43
  44     // Same thing, in milliseconds.
  45     inline double currentTimeMS()
  46     {
  47         return currentTime() * 1000.0;
  48     }
  49
  50     inline void getLocalTime(const time_t* localTime, struct tm* localTM)
  51     {
  52     #if COMPILER(MSVC7) || COMPILER(MINGW) || OS(WINCE)
  53         *localTM = *localtime(localTime);
  54     #elif COMPILER(MSVC)
  55         localtime_s(localTM, localTime);
  56     #else
  57         localtime_r(localTime, localTM);
  58     #endif
  59     }
  60
  61 } // namespace WTF
  62
  63 using WTF::currentTime;
  64
  65 #endif // CurrentTime_h
  66