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 <sys/types.h>
32 #include "libgfortran.h"
38 /* The CPU_TIME intrinsic to "compare different algorithms on the same
39 computer or discover which parts are the most expensive", so we
40 need a way to get the CPU time with the finest resolution possible.
41 We can only be accurate up to microseconds.
43 As usual with UNIX systems, unfortunately no single way is
44 available for all systems. */
46 #ifdef TIME_WITH_SYS_TIME
47 # include <sys/time.h>
51 # include <sys/time.h>
59 /* The most accurate way to get the CPU time is getrusage ().
60 If we have times(), that's good enough, too. */
61 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
62 # include <sys/resource.h>
64 /* For times(), we _must_ know the number of clock ticks per second. */
65 # if defined (HAVE_TIMES) && (defined (HZ) || defined (_SC_CLK_TCK) || defined (CLK_TCK))
66 # ifdef HAVE_SYS_PARAM_H
67 # include <sys/param.h>
69 # include <sys/times.h>
71 # if defined _SC_CLK_TCK
72 # define HZ sysconf(_SC_CLK_TCK)
77 # endif /* HAVE_TIMES etc. */
78 #endif /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H */
80 #if defined (__GNUC__) && (__GNUC__ >= 3)
81 # define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
83 # define ATTRIBUTE_ALWAYS_INLINE
86 static inline void __cpu_time_1 (long *, long *) ATTRIBUTE_ALWAYS_INLINE
;
88 /* Helper function for the actual implementation of the CPU_TIME
89 intrinsic. Returns a CPU time in microseconds or -1 if no CPU time
94 #define WIN32_LEAN_AND_MEAN
98 __cpu_time_1 (long *sec
, long *usec
)
102 unsigned long long ulltime
;
103 } kernel_time
, user_time
;
105 FILETIME unused1
, unused2
;
106 unsigned long long total_time
;
108 /* No support for Win9x. The high order bit of the DWORD
109 returned by GetVersion is 0 for NT and higher. */
110 if (GetVersion () >= 0x80000000)
117 /* The FILETIME structs filled in by GetProcessTimes represent
118 time in 100 nanosecond units. */
119 GetProcessTimes (GetCurrentProcess (), &unused1
, &unused2
,
120 &kernel_time
.ft
, &user_time
.ft
);
122 total_time
= (kernel_time
.ulltime
+ user_time
.ulltime
)/10;
123 *sec
= total_time
/ 1000000;
124 *usec
= total_time
% 1000000;
130 __cpu_time_1 (long *sec
, long *usec
)
132 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
134 getrusage (0, &usage
);
135 *sec
= usage
.ru_utime
.tv_sec
+ usage
.ru_stime
.tv_sec
;
136 *usec
= usage
.ru_utime
.tv_usec
+ usage
.ru_stime
.tv_usec
;
137 #else /* ! HAVE_GETRUSAGE || ! HAVE_SYS_RESOURCE_H */
142 *usec
= (buf
.tms_utime
+ buf
.tms_stime
) * (1000000 / HZ
);
143 #else /* ! HAVE_TIMES */
144 /* We have nothing to go on. Return -1. */
147 #endif /* HAVE_TIMES */
148 #endif /* HAVE_GETRUSAGE */
153 extern void cpu_time_4 (GFC_REAL_4
*);
154 iexport_proto(cpu_time_4
);
156 void cpu_time_4 (GFC_REAL_4
*time
)
159 __cpu_time_1 (&sec
, &usec
);
160 *time
= sec
+ usec
* (GFC_REAL_4
)1.e
-6;
164 extern void cpu_time_8 (GFC_REAL_8
*);
165 export_proto(cpu_time_8
);
167 void cpu_time_8 (GFC_REAL_8
*time
)
170 __cpu_time_1 (&sec
, &usec
);
171 *time
= sec
+ usec
* (GFC_REAL_8
)1.e
-6;
174 #ifdef HAVE_GFC_REAL_10
175 extern void cpu_time_10 (GFC_REAL_10
*);
176 export_proto(cpu_time_10
);
178 void cpu_time_10 (GFC_REAL_10
*time
)
181 __cpu_time_1 (&sec
, &usec
);
182 *time
= sec
+ usec
* (GFC_REAL_10
)1.e
-6;
186 #ifdef HAVE_GFC_REAL_16
187 extern void cpu_time_16 (GFC_REAL_16
*);
188 export_proto(cpu_time_16
);
190 void cpu_time_16 (GFC_REAL_16
*time
)
193 __cpu_time_1 (&sec
, &usec
);
194 *time
= sec
+ usec
* (GFC_REAL_16
)1.e
-6;
198 extern void second_sub (GFC_REAL_4
*);
199 export_proto(second_sub
);
202 second_sub (GFC_REAL_4
*s
)
207 extern GFC_REAL_4
second (void);
208 export_proto(second
);