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/* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
This file is part of GNU Fortran libU77 library.
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published
by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
GNU Fortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with GNU Fortran; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/times.h>
#include <sys/param.h>
#if HAVE_GETRUSAGE
# include <sys/time.h>
# include <sys/resource.h>
#endif
#include "f2c.h"
/* For dtime, etime we store the clock tick parameter (clk_tck) the
first time either of them is invoked rather than each time. This
approach probably speeds up each invocation by avoiding a system
call each time, but means that the overhead of the first call is
different to all others. */
static long clk_tck = 0;
#ifdef KR_headers
double G77_dtime_0 (tarray)
real tarray[2];
#else
double G77_dtime_0 (real tarray[2])
#endif
{
/* The getrusage version is only the default for convenience. */
#ifdef HAVE_GETRUSAGE
float utime, stime;
static float old_utime = 0.0, old_stime = 0.0;
struct rusage rbuff;
if (getrusage (RUSAGE_SELF, &rbuff) != 0)
abort ();
utime = (float) (rbuff.ru_utime).tv_sec +
(float) (rbuff.ru_utime).tv_usec/1000000.0;
tarray[0] = utime - (float) old_utime;
stime = (float) (rbuff.ru_stime).tv_sec +
(float) (rbuff.ru_stime).tv_usec/1000000.0;
tarray[1] = stime - old_stime;
#else /* HAVE_GETRUSAGE */
time_t utime, stime;
static time_t old_utime = 0, old_stime = 0;
struct tms buffer;
/* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
fixme: does using _POSIX_VERSION help? */
# if defined _SC_CLK_TCK && defined _POSIX_VERSION
if (! clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
# elif defined CLOCKS_PER_SECOND
if (! clk_tck) clk_tck = CLOCKS_PER_SECOND;
# elif defined CLK_TCK
if (! clk_tck) clk_tck = CLK_TCK;
# elif defined HZ
if (! clk_tck) clk_tck = HZ;
# elif defined HAVE_GETRUSAGE
# else
#error Dont know clock tick length
# endif
if (times(&buffer) < 0) return -1.0;
utime = buffer.tms_utime; stime = buffer.tms_stime;
tarray[0] = ((float)(utime - old_utime)) / (float)clk_tck;
tarray[1] = ((float)(stime - old_stime)) / (float)clk_tck;
#endif /* HAVE_GETRUSAGE */
old_utime = utime; old_stime = stime;
return (tarray[0]+tarray[1]);
}
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