117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* Implementation of the CPU_TIME intrinsic.
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Copyright (C) 2003 Free Software Foundation, Inc.
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This file is part of the GNU Fortran 95 runtime library (libgfor).
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Libgfor is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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Libgfor 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with libgfor; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include <sys/types.h>
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#include "libgfortran.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 CPU_TIME intrinsic to "compare different algorithms on the same
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computer or discover which parts are the most expensive", so we
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need a way to get the CPU time with the finest resolution possible.
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We can only be accurate up to 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 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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# include <sys/resource.h>
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#else
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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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# include <sys/times.h>
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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 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 void __cpu_time_1 (long *, long *) ATTRIBUTE_ALWAYS_INLINE;
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/* Helper function for the actual implementation of the CPU_TIME
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intrnsic. Returns a CPU time in microseconds or -1 if no CPU time
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could be computed. */
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static inline void
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__cpu_time_1 (long *sec, long *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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*sec = usage.ru_utime.tv_sec + usage.ru_stime.tv_sec;
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*usec = usage.ru_utime.tv_usec + usage.ru_stime.tv_usec;
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#else /* ! HAVE_GETRUSAGE || ! HAVE_SYS_RESOURCE_H */
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#ifdef HAVE_TIMES
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struct tms buf;
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times (&buf);
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*sec = 0;
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*usec = (buf.tms_utime + buf.tms_stime) * (1000000 / HZ);
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#else /* ! HAVE_TIMES */
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/* We have nothing to go on. Return -1. */
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*sec = -1;
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*usec = 0;
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#endif /* HAVE_TIMES */
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#endif /* HAVE_GETRUSAGE */
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}
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#undef CPU_TIME
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#define CPU_TIME(KIND) \
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void prefix(cpu_time_##KIND) (GFC_REAL_##KIND *__time) \
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{ \
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long sec, usec; \
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__cpu_time_1 (&sec, &usec); \
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*__time = (GFC_REAL_##KIND) sec + \
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((GFC_REAL_##KIND) usec) * 1.e-6; \
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}
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CPU_TIME(4)
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CPU_TIME(8)
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