1 /* Implementation of the CPU_TIME intrinsic.
2 Copyright (C) 2003 Free Software Foundation, Inc.
4 This file is part of the GNU Fortran 95 runtime library (libgfortran).
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.
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
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.
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. */
31 #include "libgfortran.h"
37 /* The CPU_TIME intrinsic to "compare different algorithms on the same
38 computer or discover which parts are the most expensive", so we
39 need a way to get the CPU time with the finest resolution possible.
40 We can only be accurate up to microseconds.
42 As usual with UNIX systems, unfortunately no single way is
43 available for all systems. */
45 #ifdef TIME_WITH_SYS_TIME
46 # include <sys/time.h>
50 # include <sys/time.h>
58 /* The most accurate way to get the CPU time is getrusage ().
59 If we have times(), that's good enough, too. */
60 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
61 # include <sys/resource.h>
63 /* For times(), we _must_ know the number of clock ticks per second. */
64 # if defined (HAVE_TIMES) && (defined (HZ) || defined (_SC_CLK_TCK) || defined (CLK_TCK))
65 # ifdef HAVE_SYS_PARAM_H
66 # include <sys/param.h>
68 # if defined (HAVE_SYS_TIMES_H)
69 # include <sys/times.h>
72 # if defined _SC_CLK_TCK
73 # define HZ sysconf(_SC_CLK_TCK)
78 # endif /* HAVE_TIMES etc. */
79 #endif /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H */
81 #if defined (__GNUC__) && (__GNUC__ >= 3)
82 # define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
84 # define ATTRIBUTE_ALWAYS_INLINE
87 static inline void __cpu_time_1 (long *, long *) ATTRIBUTE_ALWAYS_INLINE;
89 /* Helper function for the actual implementation of the CPU_TIME
90 intrinsic. Returns a CPU time in microseconds or -1 if no CPU time
95 #define WIN32_LEAN_AND_MEAN
99 __cpu_time_1 (long *sec, long *usec)
103 unsigned long long ulltime;
104 } kernel_time, user_time;
106 FILETIME unused1, unused2;
107 unsigned long long total_time;
109 /* No support for Win9x. The high order bit of the DWORD
110 returned by GetVersion is 0 for NT and higher. */
111 if (GetVersion () >= 0x80000000)
118 /* The FILETIME structs filled in by GetProcessTimes represent
119 time in 100 nanosecond units. */
120 GetProcessTimes (GetCurrentProcess (), &unused1, &unused2,
121 &kernel_time.ft, &user_time.ft);
123 total_time = (kernel_time.ulltime + user_time.ulltime)/10;
124 *sec = total_time / 1000000;
125 *usec = total_time % 1000000;
131 __cpu_time_1 (long *sec, long *usec)
133 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
135 getrusage (0, &usage);
136 *sec = usage.ru_utime.tv_sec + usage.ru_stime.tv_sec;
137 *usec = usage.ru_utime.tv_usec + usage.ru_stime.tv_usec;
138 #else /* ! HAVE_GETRUSAGE || ! HAVE_SYS_RESOURCE_H */
143 *usec = (buf.tms_utime + buf.tms_stime) * (1000000 / HZ);
144 #else /* ! HAVE_TIMES */
145 /* We have nothing to go on. Return -1. */
148 #endif /* HAVE_TIMES */
149 #endif /* HAVE_GETRUSAGE */
154 extern void cpu_time_4 (GFC_REAL_4 *);
155 iexport_proto(cpu_time_4);
157 void cpu_time_4 (GFC_REAL_4 *time)
160 __cpu_time_1 (&sec, &usec);
161 *time = sec + usec * (GFC_REAL_4)1.e-6;
165 extern void cpu_time_8 (GFC_REAL_8 *);
166 export_proto(cpu_time_8);
168 void cpu_time_8 (GFC_REAL_8 *time)
171 __cpu_time_1 (&sec, &usec);
172 *time = sec + usec * (GFC_REAL_8)1.e-6;
175 #ifdef HAVE_GFC_REAL_10
176 extern void cpu_time_10 (GFC_REAL_10 *);
177 export_proto(cpu_time_10);
179 void cpu_time_10 (GFC_REAL_10 *time)
182 __cpu_time_1 (&sec, &usec);
183 *time = sec + usec * (GFC_REAL_10)1.e-6;
187 #ifdef HAVE_GFC_REAL_16
188 extern void cpu_time_16 (GFC_REAL_16 *);
189 export_proto(cpu_time_16);
191 void cpu_time_16 (GFC_REAL_16 *time)
194 __cpu_time_1 (&sec, &usec);
195 *time = sec + usec * (GFC_REAL_16)1.e-6;
199 extern void second_sub (GFC_REAL_4 *);
200 export_proto(second_sub);
203 second_sub (GFC_REAL_4 *s)
208 extern GFC_REAL_4 second (void);
209 export_proto(second);