libgfortran/intrinsics/time_1.h

   1 /* Implementation of the CPU_TIME intrinsic.
   2    Copyright (C) 2003, 2007 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 2 of the License, or (at your option) any later version.
  10
  11 In addition to the permissions in the GNU General Public License, the
  12 Free Software Foundation gives you unlimited permission to link the
  13 compiled version of this file into combinations with other programs,
  14 and to distribute those combinations without any restriction coming
  15 from the use of this file.  (The General Public License restrictions
  16 do apply in other respects; for example, they cover modification of
  17 the file, and distribution when not linked into a combine
  18 executable.)
  19
  20 Libgfortran is distributed in the hope that it will be useful,
  21 but WITHOUT ANY WARRANTY; without even the implied warranty of
  22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23 GNU General Public License for more details.
  24
  25 You should have received a copy of the GNU General Public
  26 License along with libgfortran; see the file COPYING.  If not,
  27 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  28 Boston, MA 02110-1301, USA.  */
  29
  30 #ifndef LIBGFORTRAN_TIME_H
  31 #define LIBGFORTRAN_TIME_H
  32
  33 #ifdef HAVE_UNISTD_H
  34 #include <unistd.h>
  35 #endif
  36
  37 /* The time related intrinsics (DTIME, ETIME, CPU_TIME) to "compare
  38    different algorithms on the same computer or discover which parts
  39    are the most expensive", need a way to get the CPU time with the
  40    finest resolution possible. We can only be accurate up to
  41    microseconds.
  42
  43    As usual with UNIX systems, unfortunately no single way is
  44    available for all systems.  */
  45
  46 #ifdef TIME_WITH_SYS_TIME
  47 #  include <sys/time.h>
  48 #  include <time.h>
  49 #else
  50 #  if HAVE_SYS_TIME_H
  51 #    include <sys/time.h>
  52 #  else
  53 #    ifdef HAVE_TIME_H
  54 #      include <time.h>
  55 #    endif
  56 #  endif
  57 #endif
  58
  59 /* The most accurate way to get the CPU time is getrusage (). */
  60 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
  61 #  include <sys/resource.h>
  62 #endif  /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H  */
  63
  64 #if defined (__GNUC__) && (__GNUC__ >= 3)
  65 #  define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
  66 #else
  67 #  define ATTRIBUTE_ALWAYS_INLINE
  68 #endif
  69
  70 static inline int __time_1 (long *, long *, long *, long *) ATTRIBUTE_ALWAYS_INLINE;
  71
  72 /* Helper function for the actual implementation of the DTIME, ETIME and
  73    CPU_TIME intrinsics.  Returns a CPU time in microseconds or -1 if no
  74    CPU time could be computed.  */
  75
  76 #ifdef __MINGW32__
  77
  78 #define WIN32_LEAN_AND_MEAN
  79 #include <windows.h>
  80
  81 static int
  82 __time_1 (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
  83 {
  84   union {
  85     FILETIME ft;
  86     unsigned long long ulltime;
  87   } kernel_time,  user_time;
  88
  89   FILETIME unused1, unused2;
  90
  91   /* No support for Win9x.  The high order bit of the DWORD
  92      returned by GetVersion is 0 for NT and higher. */
  93   if (GetVersion () >= 0x80000000)
  94     {
  95       *user_sec = *system_sec = 0;
  96       *user_usec = *system_usec = 0;
  97       return -1;
  98     }
  99
 100   /* The FILETIME structs filled in by GetProcessTimes represent
 101      time in 100 nanosecond units. */
 102   GetProcessTimes (GetCurrentProcess (), &unused1, &unused2,
 103                    &kernel_time.ft, &user_time.ft);
 104
 105   *user_sec = user_time.ulltime / 10000000;
 106   *user_usec = (user_time.ulltime % 10000000) / 10;
 107
 108   *system_sec = kernel_time.ulltime / 10000000;
 109   *system_usec = (kernel_time.ulltime % 10000000) / 10;
 110   return 0;
 111 }
 112
 113 #else
 114
 115 static inline int
 116 __time_1 (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
 117 {
 118 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
 119   struct rusage usage;
 120   getrusage (0, &usage);
 121
 122   *user_sec = usage.ru_utime.tv_sec;
 123   *user_usec = usage.ru_utime.tv_usec;
 124   *system_sec = usage.ru_stime.tv_sec;
 125   *system_usec = usage.ru_stime.tv_usec;
 126   return 0;
 127
 128 #else /* ! HAVE_GETRUSAGE || ! HAVE_SYS_RESOURCE_H  */
 129
 130   /* We have nothing to go on.  Return -1.  */
 131   *user_sec = *system_sec = 0;
 132   *user_usec = *system_usec = 0;
 133   return -1;
 134
 135 #endif
 136 }
 137
 138 #endif
 139
 140
 141 #endif /* LIBGFORTRAN_TIME_H */