libgfortran/intrinsics/cpu_time.c

   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 #include "libgfortran.h"
  26 #include "time_1.h"
  27
  28 /* The most accurate way to get the CPU time is getrusage ().
  29    If we have times(), that's good enough, too.  */
  30 #if !defined (HAVE_GETRUSAGE) || !defined (HAVE_SYS_RESOURCE_H)
  31 /* For times(), we _must_ know the number of clock ticks per second.  */
  32 #  if defined (HAVE_TIMES) && (defined (HZ) || defined (_SC_CLK_TCK) || defined (CLK_TCK))
  33 #    ifdef HAVE_SYS_PARAM_H
  34 #      include <sys/param.h>
  35 #    endif
  36 #    if defined (HAVE_SYS_TIMES_H)
  37 #      include <sys/times.h>
  38 #    endif
  39 #    ifndef HZ
  40 #      if defined _SC_CLK_TCK
  41 #        define HZ  sysconf(_SC_CLK_TCK)
  42 #      else
  43 #        define HZ  CLK_TCK
  44 #      endif
  45 #    endif
  46 #  endif  /* HAVE_TIMES etc.  */
  47 #endif  /* !HAVE_GETRUSAGE || !HAVE_SYS_RESOURCE_H  */
  48
  49 static inline void __cpu_time_1 (long *, long *) ATTRIBUTE_ALWAYS_INLINE;
  50
  51 static inline void
  52 __cpu_time_1 (long *sec, long *usec)
  53 {
  54 #if defined(__MINGW32__) || defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
  55   long user_sec, user_usec, system_sec, system_usec;
  56   __time_1 (&user_sec, &user_usec, &system_sec, &system_usec);
  57   *sec = user_sec + system_sec;
  58   *usec = user_usec + system_usec;
  59 #else /* ! HAVE_GETRUSAGE || ! HAVE_SYS_RESOURCE_H  */
  60 #ifdef HAVE_TIMES
  61   struct tms buf;
  62   times (&buf);
  63   *sec = 0;
  64   *usec = (buf.tms_utime + buf.tms_stime) * (1000000 / HZ);
  65 #else /* ! HAVE_TIMES */
  66   /* We have nothing to go on.  Return -1.  */
  67   *sec = -1;
  68   *usec = 0;
  69 #endif  /* HAVE_TIMES */
  70 #endif  /* __MINGW32__ || HAVE_GETRUSAGE */
  71 }
  72
  73
  74 extern void cpu_time_4 (GFC_REAL_4 *);
  75 iexport_proto(cpu_time_4);
  76
  77 void cpu_time_4 (GFC_REAL_4 *time)
  78 {
  79   long sec, usec;
  80   __cpu_time_1 (&sec, &usec);
  81   *time = sec + usec * GFC_REAL_4_LITERAL(1.e-6);
  82 }
  83 iexport(cpu_time_4);
  84
  85 extern void cpu_time_8 (GFC_REAL_8 *);
  86 export_proto(cpu_time_8);
  87
  88 void cpu_time_8 (GFC_REAL_8 *time)
  89 {
  90   long sec, usec;
  91   __cpu_time_1 (&sec, &usec);
  92   *time = sec + usec * GFC_REAL_8_LITERAL(1.e-6);
  93 }
  94
  95 #ifdef HAVE_GFC_REAL_10
  96 extern void cpu_time_10 (GFC_REAL_10 *);
  97 export_proto(cpu_time_10);
  98
  99 void cpu_time_10 (GFC_REAL_10 *time)
 100 {
 101   long sec, usec;
 102   __cpu_time_1 (&sec, &usec);
 103   *time = sec + usec * GFC_REAL_10_LITERAL(1.e-6);
 104 }
 105 #endif
 106
 107 #ifdef HAVE_GFC_REAL_16
 108 extern void cpu_time_16 (GFC_REAL_16 *);
 109 export_proto(cpu_time_16);
 110
 111 void cpu_time_16 (GFC_REAL_16 *time)
 112 {
 113   long sec, usec;
 114   __cpu_time_1 (&sec, &usec);
 115   *time = sec + usec * GFC_REAL_16_LITERAL(1.e-6);
 116 }
 117 #endif
 118
 119 extern void second_sub (GFC_REAL_4 *);
 120 export_proto(second_sub);
 121
 122 void
 123 second_sub (GFC_REAL_4 *s)
 124 {
 125   cpu_time_4 (s);
 126 }
 127
 128 extern GFC_REAL_4 second (void);
 129 export_proto(second);
 130
 131 GFC_REAL_4
 132 second (void)
 133 {
 134   GFC_REAL_4 s;
 135   cpu_time_4 (&s);
 136   return s;
 137 }