CPUTimer.inl

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//
//
/*
    Copyright (C) 2000 PARAPET partners
    Copyright (C) 2000- 2009, Hammersmith Imanet Ltd
    This file is part of STIR.
 
    SPDX-License-Identifier: Apache-2.0 AND License-ref-PARAPET-license
 
    See STIR/LICENSE.txt for details
*/
 
/*
  History:
   1.0 by Kris Thielemans
   1.1 by Kris Thielemans
     use times() and GetProcessTimes()
   1.2 by Kris Thielemans
     moved inlines to separate file
*/
 
#if defined(__OS_UNIX__) && !defined(STIR_CPUTimer_use_clock)
// use times() instead of clock() for Unix. (Higher resolution)
// Only tested for AIX, sun, OSF, but it is probably POSIX
// If does not work for your OS, use the version with clock() below
 
#  include <sys/times.h>
#  include <unistd.h>
 
START_NAMESPACE_STIR
 
double
CPUTimer::get_current_value() const
{
  struct tms t;
  times(&t);
  return double(t.tms_utime) / sysconf(_SC_CLK_TCK);
}
 
#elif defined(__OS_WIN__) && !defined(STIR_CPUTimer_use_clock)
 
// VC++ 5.0 needs GetProcessTimes(), due to a bug in clock()
// This breaks on Win95 though
#  include <windows.h>
 
START_NAMESPACE_STIR
 
// undefine the min,max macros again (we did this already in Tomography_common.h)
#  ifdef max
#    undef max
#  endif
#  ifdef min
#    undef min
#  endif
 
double
CPUTimer::get_current_value() const
{
  FILETIME CreationTime; // when the process was created
  FILETIME ExitTime;     // when the process exited
  FILETIME KernelTime;   // time the process has spent in kernel mode
  FILETIME UserTime;     // time the process has spent in user mode
 
  GetProcessTimes(GetCurrentProcess(), &CreationTime, &ExitTime, &KernelTime, &UserTime);
  //  gcc still has problems with LARGE_INTEGER
#  ifndef __GNUG__
  LARGE_INTEGER ll;
  ll.LowPart = UserTime.dwLowDateTime;
  ll.HighPart = UserTime.dwHighDateTime;
 
  return static_cast<double>(ll.QuadPart) / 1E7;
#  else
  // can't use LONGLONG in cygwin B20.1
  const long long value = (static_cast<long long>(UserTime.dwHighDateTime) << 32) + UserTime.dwLowDateTime;
  return static_cast<double>(value) / 1E7;
#  endif
}
 
#else // all other systems
 
#  include <time.h>
 
START_NAMESPACE_STIR
 
double
CPUTimer::get_current_value() const
{
  return double(clock()) / CLOCKS_PER_SEC;
}
#endif
 
END_NAMESPACE_STIR