121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/* Return time used so far, in microseconds.
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Copyright (C) 1994-2017 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty 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 libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "config.h"
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#include "ansidecl.h"
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#include "libiberty.h"
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/* On some systems (such as WindISS), you must include <sys/types.h>
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to get the definition of "time_t" before you include <time.h>. */
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#include <sys/types.h>
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/* There are several ways to get elapsed execution time; unfortunately no
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single way is available for all host systems, nor are there reliable
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ways to find out which way is correct for a given host. */
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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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#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
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#include <sys/resource.h>
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#endif
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#ifdef HAVE_TIMES
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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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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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/* This is a fallback; if wrong, it will likely make obviously wrong
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results. */
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#ifndef CLOCKS_PER_SEC
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#define CLOCKS_PER_SEC 1
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#endif
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#ifndef RUSAGE_SELF
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#define RUSAGE_SELF 0
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#endif
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#ifdef _SC_CLK_TCK
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#define GNU_HZ sysconf(_SC_CLK_TCK)
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#else
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#ifdef HZ
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#define GNU_HZ HZ
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#else
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#ifdef CLOCKS_PER_SEC
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#define GNU_HZ CLOCKS_PER_SEC
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#endif
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#endif
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#endif
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/*
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@deftypefn Replacement long get_run_time (void)
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Returns the time used so far, in microseconds. If possible, this is
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the time used by this process, else it is the elapsed time since the
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process started.
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@end deftypefn
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*/
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long
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get_run_time (void)
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{
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#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)
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struct rusage rusage;
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getrusage (RUSAGE_SELF, &rusage);
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return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec
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+ rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);
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#else /* ! HAVE_GETRUSAGE */
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#ifdef HAVE_TIMES
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struct tms tms;
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times (&tms);
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return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);
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#else /* ! HAVE_TIMES */
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/* Fall back on clock and hope it's correctly implemented. */
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const long clocks_per_sec = CLOCKS_PER_SEC;
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if (clocks_per_sec <= 1000000)
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return clock () * (1000000 / clocks_per_sec);
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else
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return clock () / clocks_per_sec;
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#endif /* HAVE_TIMES */
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#endif /* HAVE_GETRUSAGE */
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}
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