libgfortran/intrinsics/time_1.h

   1 /* Implementation of the CPU_TIME intrinsic.
   2    Copyright (C) 2003, 2007, 2009 Free Software Foundation, Inc.
   3
   4 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   5
   6 Libgfortran is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public
   8 License as published by the Free Software Foundation; either
   9 version 3 of the License, or (at your option) any later version.
  10
  11 Libgfortran is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 #ifndef LIBGFORTRAN_TIME_H
  26 #define LIBGFORTRAN_TIME_H
  27
  28 #ifdef HAVE_UNISTD_H
  29 #include <unistd.h>
  30 #endif
  31
  32 /* The time related intrinsics (DTIME, ETIME, CPU_TIME) to "compare
  33    different algorithms on the same computer or discover which parts
  34    are the most expensive", need a way to get the CPU time with the
  35    finest resolution possible. We can only be accurate up to
  36    microseconds.
  37
  38    As usual with UNIX systems, unfortunately no single way is
  39    available for all systems.  */
  40
  41 #ifdef TIME_WITH_SYS_TIME
  42 #  include <sys/time.h>
  43 #  include <time.h>
  44 #else
  45 #  if HAVE_SYS_TIME_H
  46 #    include <sys/time.h>
  47 #  else
  48 #    ifdef HAVE_TIME_H
  49 #      include <time.h>
  50 #    endif
  51 #  endif
  52 #endif
  53
  54 /* The most accurate way to get the CPU time is getrusage (). */
  55 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
  56 #  include <sys/resource.h>
  57 #endif  /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H  */
  58
  59 #if defined (__GNUC__) && (__GNUC__ >= 3)
  60 #  define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
  61 #else
  62 #  define ATTRIBUTE_ALWAYS_INLINE
  63 #endif
  64
  65 static inline int __time_1 (long *, long *, long *, long *) ATTRIBUTE_ALWAYS_INLINE;
  66
  67 /* Helper function for the actual implementation of the DTIME, ETIME and
  68    CPU_TIME intrinsics.  Returns a CPU time in microseconds or -1 if no
  69    CPU time could be computed.  */
  70
  71 #ifdef __MINGW32__
  72
  73 #define WIN32_LEAN_AND_MEAN
  74 #include <windows.h>
  75
  76 static int
  77 __time_1 (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
  78 {
  79   union {
  80     FILETIME ft;
  81     unsigned long long ulltime;
  82   } kernel_time,  user_time;
  83
  84   FILETIME unused1, unused2;
  85
  86   /* No support for Win9x.  The high order bit of the DWORD
  87      returned by GetVersion is 0 for NT and higher. */
  88   if (GetVersion () >= 0x80000000)
  89     {
  90       *user_sec = *system_sec = 0;
  91       *user_usec = *system_usec = 0;
  92       return -1;
  93     }
  94
  95   /* The FILETIME structs filled in by GetProcessTimes represent
  96      time in 100 nanosecond units. */
  97   GetProcessTimes (GetCurrentProcess (), &unused1, &unused2,
  98                    &kernel_time.ft, &user_time.ft);
  99
 100   *user_sec = user_time.ulltime / 10000000;
 101   *user_usec = (user_time.ulltime % 10000000) / 10;
 102
 103   *system_sec = kernel_time.ulltime / 10000000;
 104   *system_usec = (kernel_time.ulltime % 10000000) / 10;
 105   return 0;
 106 }
 107
 108 #else
 109
 110 static inline int
 111 __time_1 (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
 112 {
 113 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
 114   struct rusage usage;
 115   getrusage (0, &usage);
 116
 117   *user_sec = usage.ru_utime.tv_sec;
 118   *user_usec = usage.ru_utime.tv_usec;
 119   *system_sec = usage.ru_stime.tv_sec;
 120   *system_usec = usage.ru_stime.tv_usec;
 121   return 0;
 122
 123 #else /* ! HAVE_GETRUSAGE || ! HAVE_SYS_RESOURCE_H  */
 124
 125   /* We have nothing to go on.  Return -1.  */
 126   *user_sec = *system_sec = 0;
 127   *user_usec = *system_usec = 0;
 128   return -1;
 129
 130 #endif
 131 }
 132
 133 #endif
 134
 135
 136 #endif /* LIBGFORTRAN_TIME_H */