libgfortran/intrinsics/time_1.h

   1 /* Wrappers for platform timing functions.
   2    Copyright (C) 2003, 2007, 2009, 2011 Free Software Foundation, Inc.
   3
   4 This file is part of the GNU Fortran 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 #ifdef HAVE_SYS_TYPES_H
  55      #include <sys/types.h>
  56 #endif
  57
  58 /* The most accurate way to get the CPU time is getrusage (). */
  59 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
  60 #  include <sys/resource.h>
  61 #endif  /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H  */
  62
  63 /* The most accurate way to get the CPU time is getrusage ().
  64    If we have times(), that's good enough, too.  */
  65 #if !defined (HAVE_GETRUSAGE) || !defined (HAVE_SYS_RESOURCE_H)
  66 /* For times(), we _must_ know the number of clock ticks per second.  */
  67 #  if defined (HAVE_TIMES) && (defined (HZ) || defined (_SC_CLK_TCK) || defined (CLK_TCK))
  68 #    ifdef HAVE_SYS_PARAM_H
  69 #      include <sys/param.h>
  70 #    endif
  71 #    if defined (HAVE_SYS_TIMES_H)
  72 #      include <sys/times.h>
  73 #    endif
  74 #    ifndef HZ
  75 #      if defined _SC_CLK_TCK
  76 #        define HZ  sysconf(_SC_CLK_TCK)
  77 #      else
  78 #        define HZ  CLK_TCK
  79 #      endif
  80 #    endif
  81 #  endif  /* HAVE_TIMES etc.  */
  82 #endif  /* !HAVE_GETRUSAGE || !HAVE_SYS_RESOURCE_H  */
  83
  84
  85 #if defined (__GNUC__) && (__GNUC__ >= 3)
  86 #  define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
  87 #else
  88 #  define ATTRIBUTE_ALWAYS_INLINE
  89 #endif
  90
  91 static inline int gf_cputime (long *, long *, long *, long *) ATTRIBUTE_ALWAYS_INLINE;
  92
  93 /* Helper function for the actual implementation of the DTIME, ETIME and
  94    CPU_TIME intrinsics.  Returns 0 for success or -1 if no
  95    CPU time could be computed.  */
  96
  97 #ifdef __MINGW32__
  98
  99 #define WIN32_LEAN_AND_MEAN
 100 #include <windows.h>
 101
 102 static int
 103 gf_cputime (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
 104 {
 105   union {
 106     FILETIME ft;
 107     unsigned long long ulltime;
 108   } kernel_time,  user_time;
 109
 110   FILETIME unused1, unused2;
 111
 112   /* No support for Win9x.  The high order bit of the DWORD
 113      returned by GetVersion is 0 for NT and higher. */
 114   if (GetVersion () >= 0x80000000)
 115     {
 116       *user_sec = *system_sec = 0;
 117       *user_usec = *system_usec = 0;
 118       return -1;
 119     }
 120
 121   /* The FILETIME structs filled in by GetProcessTimes represent
 122      time in 100 nanosecond units. */
 123   GetProcessTimes (GetCurrentProcess (), &unused1, &unused2,
 124                    &kernel_time.ft, &user_time.ft);
 125
 126   *user_sec = user_time.ulltime / 10000000;
 127   *user_usec = (user_time.ulltime % 10000000) / 10;
 128
 129   *system_sec = kernel_time.ulltime / 10000000;
 130   *system_usec = (kernel_time.ulltime % 10000000) / 10;
 131   return 0;
 132 }
 133
 134 #else
 135
 136 static inline int
 137 gf_cputime (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
 138 {
 139 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
 140   struct rusage usage;
 141   int err;
 142   err = getrusage (RUSAGE_SELF, &usage);
 143
 144   *user_sec = usage.ru_utime.tv_sec;
 145   *user_usec = usage.ru_utime.tv_usec;
 146   *system_sec = usage.ru_stime.tv_sec;
 147   *system_usec = usage.ru_stime.tv_usec;
 148   return err;
 149
 150 #elif defined HAVE_TIMES
 151   struct tms buf;
 152   clock_t err;
 153   err = times (&buf);
 154   *user_sec = buf.tms_utime / HZ;
 155   *user_usec = buf.tms_utime % HZ * (1000000 / HZ);
 156   *system_sec = buf.tms_stime / HZ;
 157   *system_usec = buf.tms_stime % HZ * (1000000 / HZ);
 158   if ((err == (clock_t) -1) && errno != 0)
 159     return -1;
 160   return 0;
 161
 162 #else
 163
 164   /* We have nothing to go on.  Return -1.  */
 165   *user_sec = *system_sec = 0;
 166   *user_usec = *system_usec = 0;
 167   errno = ENOSYS;
 168   return -1;
 169
 170 #endif
 171 }
 172
 173 #endif
 174
 175
 176 /* POSIX states that CLOCK_REALTIME must be present if clock_gettime
 177    is available, others are optional.  */
 178 #ifdef CLOCK_REALTIME
 179 #define GF_CLOCK_REALTIME CLOCK_REALTIME
 180 #else
 181 #define GF_CLOCK_REALTIME 0
 182 #endif
 183
 184 #ifdef CLOCK_MONOTONIC
 185 #define GF_CLOCK_MONOTONIC CLOCK_MONOTONIC
 186 #else
 187 #define GF_CLOCK_REALTIME GF_CLOCK_REALTIME
 188 #endif
 189
 190 /* Arguments:
 191    clock_id - INPUT, must be either GF_CLOCK_REALTIME or GF_CLOCK_MONOTONIC
 192    secs     - OUTPUT, seconds
 193    nanosecs - OUTPUT, OPTIONAL, nanoseconds
 194
 195    If clock_id equals GF_CLOCK_REALTIME, the OUTPUT arguments shall be
 196    the number of seconds and nanoseconds since the Epoch. If clock_id
 197    equals GF_CLOCK_MONOTONIC, and if the target supports it, the
 198    OUTPUT arguments represent a monotonically incrementing clock
 199    starting from some unspecified time in the past.
 200
 201    Return value: 0 for success, -1 for error. In case of error, errno
 202    is set.
 203 */
 204 static inline int
 205 gf_gettime (int clock_id __attribute__((unused)), time_t * secs,
 206             long * nanosecs)
 207 {
 208 #ifdef HAVE_CLOCK_GETTIME
 209   struct timespec ts;
 210   int err;
 211   err = clock_gettime (clock_id, &ts);
 212   *secs = ts.tv_sec;
 213   if (nanosecs)
 214     *nanosecs = ts.tv_nsec;
 215   return err;
 216 #elif HAVE_GETTIMEOFDAY
 217   struct timeval tv;
 218   int err;
 219   err = gettimeofday (&tv, NULL);
 220   *secs = tv.tv_sec;
 221   if (nanosecs)
 222     *nanosecs = tv.tv_usec * 1000;
 223   return err;
 224 #elif HAVE_TIME
 225   time_t t, t2;
 226   t = time (&t2);
 227   *secs = t2;
 228   if (nanosecs)
 229     *nanosecs = 0;
 230   if (t == ((time_t)-1))
 231     return -1;
 232   return 0;
 233 #else
 234   *secs = 0;
 235   if (nanosecs)
 236     *nanosecs = 0;
 237   errno = ENOSYS;
 238   return -1;
 239 #endif
 240 }
 241
 242
 243 #endif /* LIBGFORTRAN_TIME_H */