241 lines
6.6 KiB
C
241 lines
6.6 KiB
C
/* Wrappers for platform timing functions.
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Copyright (C) 2003-2020 Free Software Foundation, Inc.
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef LIBGFORTRAN_TIME_H
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#define LIBGFORTRAN_TIME_H
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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/* The time related intrinsics (DTIME, ETIME, CPU_TIME) to "compare
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different algorithms on the same computer or discover which parts
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are the most expensive", need a way to get the CPU time with the
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finest resolution possible. We can only be accurate up to
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microseconds.
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As usual with UNIX systems, unfortunately no single way is
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available for all systems. */
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <time.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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/* The most accurate way to get the CPU time is getrusage (). */
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#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
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# include <sys/resource.h>
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#endif /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H */
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/* The most accurate way to get the CPU time is getrusage ().
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If we have times(), that's good enough, too. */
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#if !defined (HAVE_GETRUSAGE) || !defined (HAVE_SYS_RESOURCE_H)
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/* For times(), we _must_ know the number of clock ticks per second. */
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# if defined (HAVE_TIMES) && (defined (HZ) || defined (_SC_CLK_TCK) || defined (CLK_TCK))
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# ifdef HAVE_SYS_PARAM_H
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# include <sys/param.h>
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# endif
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# if defined (HAVE_SYS_TIMES_H)
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# include <sys/times.h>
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# endif
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# ifndef HZ
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# if defined _SC_CLK_TCK
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# define HZ sysconf(_SC_CLK_TCK)
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# else
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# define HZ CLK_TCK
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# endif
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# endif
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# endif /* HAVE_TIMES etc. */
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#endif /* !HAVE_GETRUSAGE || !HAVE_SYS_RESOURCE_H */
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/* If the re-entrant version of localtime is not available, provide a
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fallback implementation. On some targets where the _r version is
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not available, localtime uses thread-local storage so it's
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threadsafe. */
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#ifndef HAVE_LOCALTIME_R
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/* If _POSIX is defined localtime_r gets defined by mingw-w64 headers. */
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#ifdef localtime_r
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#undef localtime_r
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#endif
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static inline struct tm *
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localtime_r (const time_t * timep, struct tm * result)
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{
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*result = *localtime (timep);
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return result;
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}
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#endif
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/* Helper function for the actual implementation of the DTIME, ETIME and
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CPU_TIME intrinsics. Returns 0 for success or -1 if no
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CPU time could be computed. */
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#if defined(__MINGW32__)
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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static inline int
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gf_cputime (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
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{
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union {
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FILETIME ft;
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unsigned long long ulltime;
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} kernel_time, user_time;
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FILETIME unused1, unused2;
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/* No support for Win9x. The high order bit of the DWORD
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returned by GetVersion is 0 for NT and higher. */
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if (GetVersion () >= 0x80000000)
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{
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*user_sec = *system_sec = 0;
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*user_usec = *system_usec = 0;
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return -1;
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}
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/* The FILETIME structs filled in by GetProcessTimes represent
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time in 100 nanosecond units. */
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GetProcessTimes (GetCurrentProcess (), &unused1, &unused2,
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&kernel_time.ft, &user_time.ft);
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*user_sec = user_time.ulltime / 10000000;
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*user_usec = (user_time.ulltime % 10000000) / 10;
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*system_sec = kernel_time.ulltime / 10000000;
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*system_usec = (kernel_time.ulltime % 10000000) / 10;
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return 0;
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}
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#else
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static inline int
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gf_cputime (long *user_sec, long *user_usec, long *system_sec, long *system_usec)
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{
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#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
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struct rusage usage;
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int err;
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err = getrusage (RUSAGE_SELF, &usage);
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*user_sec = usage.ru_utime.tv_sec;
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*user_usec = usage.ru_utime.tv_usec;
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*system_sec = usage.ru_stime.tv_sec;
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*system_usec = usage.ru_stime.tv_usec;
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return err;
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#elif defined HAVE_TIMES
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struct tms buf;
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clock_t err;
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err = times (&buf);
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long hz = HZ;
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*user_sec = buf.tms_utime / hz;
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*user_usec = (buf.tms_utime % hz) * (1000000. / hz);
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*system_sec = buf.tms_stime / hz;
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*system_usec = (buf.tms_stime % hz) * (1000000. / hz);
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if ((err == (clock_t) -1) && errno != 0)
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return -1;
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return 0;
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#elif defined(HAVE_CLOCK_GETTIME) && (defined(CLOCK_PROCESS_CPUTIME_ID) \
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|| defined(CLOCK_THREAD_CPUTIME_ID))
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/* Newer versions of VxWorks have CLOCK_THREAD_CPUTIME_ID giving
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per-thread CPU time. CLOCK_PROCESS_CPUTIME_ID would be better
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but is not available. */
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#ifndef CLOCK_PROCESS_CPUTIME_ID
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#define CLOCK_PROCESS_CPUTIME_ID CLOCK_THREAD_CPUTIME_ID
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#endif
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struct timespec ts;
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int err = clock_gettime (CLOCK_PROCESS_CPUTIME_ID, &ts);
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*user_sec = ts.tv_sec;
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*user_usec = ts.tv_nsec / 1000;
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*system_sec = *system_usec = 0;
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return err;
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#else
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clock_t c = clock ();
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*user_sec = c / CLOCKS_PER_SEC;
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*user_usec = (c % CLOCKS_PER_SEC) * (1000000. / CLOCKS_PER_SEC);
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*system_sec = *system_usec = 0;
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if (c == (clock_t) -1)
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return -1;
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return 0;
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#endif
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}
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#endif
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/* Realtime clock with microsecond resolution, falling back to other
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functions if the target does not support gettimeofday().
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Arguments:
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secs - OUTPUT, seconds
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usecs - OUTPUT, microseconds
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The OUTPUT arguments shall represent the number of seconds and
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microseconds since the Epoch.
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Return value: 0 for success, -1 for error. In case of error, errno
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is set.
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*/
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static inline int
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gf_gettime (time_t * secs, long * usecs)
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{
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#ifdef HAVE_GETTIMEOFDAY
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struct timeval tv;
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int err;
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err = gettimeofday (&tv, NULL);
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*secs = tv.tv_sec;
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*usecs = tv.tv_usec;
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return err;
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#elif defined(HAVE_CLOCK_GETTIME)
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struct timespec ts;
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int err = clock_gettime (CLOCK_REALTIME, &ts);
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*secs = ts.tv_sec;
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*usecs = ts.tv_nsec / 1000;
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return err;
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#else
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time_t t = time (NULL);
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*secs = t;
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*usecs = 0;
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if (t == ((time_t)-1))
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return -1;
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return 0;
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#endif
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}
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#endif /* LIBGFORTRAN_TIME_H */
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