137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/* Implementation of the CPU_TIME intrinsic.
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Copyright (C) 2003, 2007, 2009 Free Software Foundation, Inc.
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This file is part of the GNU Fortran 95 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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/* 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 TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# ifdef HAVE_TIME_H
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# include <time.h>
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# endif
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# endif
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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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#if defined (__GNUC__) && (__GNUC__ >= 3)
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# define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
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#else
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# define ATTRIBUTE_ALWAYS_INLINE
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#endif
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static inline int __time_1 (long *, long *, long *, long *) ATTRIBUTE_ALWAYS_INLINE;
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/* Helper function for the actual implementation of the DTIME, ETIME and
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CPU_TIME intrinsics. Returns a CPU time in microseconds or -1 if no
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CPU time could be computed. */
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#ifdef __MINGW32__
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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static int
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__time_1 (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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__time_1 (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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getrusage (0, &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 0;
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#else /* ! HAVE_GETRUSAGE || ! HAVE_SYS_RESOURCE_H */
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/* We have nothing to go on. Return -1. */
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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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#endif
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}
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#endif
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#endif /* LIBGFORTRAN_TIME_H */
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