91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
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/* Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of GNU Fortran libU77 library.
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This library is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published
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by the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GNU Fortran 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with GNU Fortran; see the file COPYING.LIB. If
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not, 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <sys/types.h>
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#if HAVE_SYS_TIMES_H
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# include <sys/times.h>
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#endif
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#if HAVE_SYS_PARAM_H
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# include <sys/param.h>
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#endif
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#if HAVE_GETRUSAGE
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# include <sys/time.h>
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# include <sys/resource.h>
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#endif
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#include <errno.h> /* for ENOSYS */
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#include "f2c.h"
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/* For dtime, etime we store the clock tick parameter (clk_tck) the
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first time either of them is invoked rather than each time. This
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approach probably speeds up each invocation by avoiding a system
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call each time, but means that the overhead of the first call is
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different to all others. */
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static long clk_tck = 0;
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#ifdef KR_headers
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double G77_etime_0 (tarray)
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real tarray[2];
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#else
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double G77_etime_0 (real tarray[2])
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#endif
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{
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#if defined (HAVE_GETRUSAGE) || defined (HAVE_TIMES)
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/* The getrusage version is only the default for convenience. */
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#ifdef HAVE_GETRUSAGE
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struct rusage rbuff;
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if (getrusage (RUSAGE_SELF, &rbuff) != 0)
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abort ();
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tarray[0] = ((float) (rbuff.ru_utime).tv_sec +
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(float) (rbuff.ru_utime).tv_usec/1000000.0);
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tarray[1] = ((float) (rbuff.ru_stime).tv_sec +
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(float) (rbuff.ru_stime).tv_usec/1000000.0);
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#else /* HAVE_GETRUSAGE */
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struct tms buffer;
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/* NeXTStep seems to define _SC_CLK_TCK but not to have sysconf;
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fixme: does using _POSIX_VERSION help? */
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# if defined _SC_CLK_TCK && defined _POSIX_VERSION
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if (! clk_tck) clk_tck = sysconf(_SC_CLK_TCK);
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# elif defined CLOCKS_PER_SECOND
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if (! clk_tck) clk_tck = CLOCKS_PER_SECOND;
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# elif defined CLK_TCK
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if (! clk_tck) clk_tck = CLK_TCK;
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# elif defined HZ
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if (! clk_tck) clk_tck = HZ;
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# elif defined HAVE_GETRUSAGE
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# else
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#error Dont know clock tick length
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# endif
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if (times(&buffer) < 0) return -1.0;
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tarray[0] = (float) buffer.tms_utime / (float)clk_tck;
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tarray[1] = (float) buffer.tms_stime / (float)clk_tck;
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#endif /* HAVE_GETRUSAGE */
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return (tarray[0]+tarray[1]);
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#else /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
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errno = ENOSYS;
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return 0.0;
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#endif /* ! HAVE_GETRUSAGE && ! HAVE_TIMES */
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}
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