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 /* POSIX states that CLOCK_REALTIME must be present if clock_gettime
179 is available, others are optional. */
180 #ifdef CLOCK_REALTIME
181 #define GF_CLOCK_REALTIME CLOCK_REALTIME
183 #define GF_CLOCK_REALTIME 0
186 #ifdef CLOCK_MONOTONIC
187 #define GF_CLOCK_MONOTONIC CLOCK_MONOTONIC
189 #define GF_CLOCK_MONOTONIC GF_CLOCK_REALTIME
192 /* Weakref trickery for clock_gettime(). On Glibc, clock_gettime()
193 requires us to link in librt, which also pulls in libpthread. In
194 order to avoid this by default, only call clock_gettime() through a
196 #ifdef HAVE_CLOCK_GETTIME
198 static int weak_gettime (clockid_t, struct timespec *)
199 __attribute__((__weakref__("clock_gettime")));
201 static inline int weak_gettime (clockid_t clk_id, struct timespec *res)
203 return clock_gettime (clk_id, res);
209 clock_id - INPUT, must be either GF_CLOCK_REALTIME or GF_CLOCK_MONOTONIC
210 secs - OUTPUT, seconds
211 nanosecs - OUTPUT, OPTIONAL, nanoseconds
213 If clock_id equals GF_CLOCK_REALTIME, the OUTPUT arguments shall be
214 the number of seconds and nanoseconds since the Epoch. If clock_id
215 equals GF_CLOCK_MONOTONIC, and if the target supports it, the
216 OUTPUT arguments represent a monotonically incrementing clock
217 starting from some unspecified time in the past.
219 Return value: 0 for success, -1 for error. In case of error, errno
223 gf_gettime (int clock_id __attribute__((unused)), time_t * secs,
226 #ifdef HAVE_CLOCK_GETTIME
231 err = weak_gettime (clock_id, &ts);
234 *nanosecs = ts.tv_nsec;
238 #ifdef HAVE_GETTIMEOFDAY
241 err = gettimeofday (&tv, NULL);
244 *nanosecs = tv.tv_usec * 1000;
252 if (t == ((time_t)-1))
265 #endif /* LIBGFORTRAN_TIME_H */