1 /* Wrappers for platform timing functions.
2 Copyright (C) 2003, 2007, 2009, 2011 Free Software Foundation, Inc.
4 This file is part of the GNU Fortran 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 3 of the License, or (at your option) any later version.
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.
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.
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/>. */
25 #ifndef LIBGFORTRAN_TIME_H
26 #define LIBGFORTRAN_TIME_H
34 /* The time related intrinsics (DTIME, ETIME, CPU_TIME) to "compare
35 different algorithms on the same computer or discover which parts
36 are the most expensive", need a way to get the CPU time with the
37 finest resolution possible. We can only be accurate up to
40 As usual with UNIX systems, unfortunately no single way is
41 available for all systems. */
43 #ifdef TIME_WITH_SYS_TIME
44 # include <sys/time.h>
48 # include <sys/time.h>
56 #ifdef HAVE_SYS_TYPES_H
57 #include <sys/types.h>
60 /* The most accurate way to get the CPU time is getrusage (). */
61 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
62 # include <sys/resource.h>
63 #endif /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H */
65 /* The most accurate way to get the CPU time is getrusage ().
66 If we have times(), that's good enough, too. */
67 #if !defined (HAVE_GETRUSAGE) || !defined (HAVE_SYS_RESOURCE_H)
68 /* For times(), we _must_ know the number of clock ticks per second. */
69 # if defined (HAVE_TIMES) && (defined (HZ) || defined (_SC_CLK_TCK) || defined (CLK_TCK))
70 # ifdef HAVE_SYS_PARAM_H
71 # include <sys/param.h>
73 # if defined (HAVE_SYS_TIMES_H)
74 # include <sys/times.h>
77 # if defined _SC_CLK_TCK
78 # define HZ sysconf(_SC_CLK_TCK)
83 # endif /* HAVE_TIMES etc. */
84 #endif /* !HAVE_GETRUSAGE || !HAVE_SYS_RESOURCE_H */
87 #if defined (__GNUC__) && (__GNUC__ >= 3)
88 # define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
90 # define ATTRIBUTE_ALWAYS_INLINE
93 static inline int gf_cputime (long *, long *, long *, long *) ATTRIBUTE_ALWAYS_INLINE;
95 /* Helper function for the actual implementation of the DTIME, ETIME and
96 CPU_TIME intrinsics. Returns 0 for success or -1 if no
97 CPU time could be computed. */
101 #define WIN32_LEAN_AND_MEAN
105 gf_cputime (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
109 unsigned long long ulltime;
110 } kernel_time, user_time;
112 FILETIME unused1, unused2;
114 /* No support for Win9x. The high order bit of the DWORD
115 returned by GetVersion is 0 for NT and higher. */
116 if (GetVersion () >= 0x80000000)
118 *user_sec = *system_sec = 0;
119 *user_usec = *system_usec = 0;
123 /* The FILETIME structs filled in by GetProcessTimes represent
124 time in 100 nanosecond units. */
125 GetProcessTimes (GetCurrentProcess (), &unused1, &unused2,
126 &kernel_time.ft, &user_time.ft);
128 *user_sec = user_time.ulltime / 10000000;
129 *user_usec = (user_time.ulltime % 10000000) / 10;
131 *system_sec = kernel_time.ulltime / 10000000;
132 *system_usec = (kernel_time.ulltime % 10000000) / 10;
139 gf_cputime (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
141 #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
144 err = getrusage (RUSAGE_SELF, &usage);
146 *user_sec = usage.ru_utime.tv_sec;
147 *user_usec = usage.ru_utime.tv_usec;
148 *system_sec = usage.ru_stime.tv_sec;
149 *system_usec = usage.ru_stime.tv_usec;
152 #elif defined HAVE_TIMES
156 *user_sec = buf.tms_utime / HZ;
157 *user_usec = buf.tms_utime % HZ * (1000000 / HZ);
158 *system_sec = buf.tms_stime / HZ;
159 *system_usec = buf.tms_stime % HZ * (1000000 / HZ);
160 if ((err == (clock_t) -1) && errno != 0)
166 /* We have nothing to go on. Return -1. */
167 *user_sec = *system_sec = 0;
168 *user_usec = *system_usec = 0;
178 /* Realtime clock with microsecond resolution, falling back to less
179 precise functions if the target does not support gettimeofday().
182 secs - OUTPUT, seconds
183 usecs - OUTPUT, microseconds
185 The OUTPUT arguments shall represent the number of seconds and
186 nanoseconds since the Epoch.
188 Return value: 0 for success, -1 for error. In case of error, errno
192 gf_gettime (time_t * secs, long * usecs)
194 #ifdef HAVE_GETTIMEOFDAY
197 err = gettimeofday (&tv, NULL);
206 if (t == ((time_t)-1))
218 #endif /* LIBGFORTRAN_TIME_H */