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104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
/* ANSI-compatible clock function.
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Copyright (C) 1994-2017 Free Software Foundation, Inc.
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This file is part of the libiberty library. This library is free
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software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version.
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This library 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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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/*
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@deftypefn Supplemental long clock (void)
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Returns an approximation of the CPU time used by the process as a
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@code{clock_t}; divide this number by @samp{CLOCKS_PER_SEC} to get the
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number of seconds used.
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@end deftypefn
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*/
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#include "config.h"
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#ifdef 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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#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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#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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/* FIXME: should be able to declare as clock_t. */
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long
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clock (void)
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{
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#ifdef HAVE_GETRUSAGE
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struct rusage rusage;
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getrusage (0, &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
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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
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#ifdef VMS
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struct
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{
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int proc_user_time;
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int proc_system_time;
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int child_user_time;
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int child_system_time;
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} vms_times;
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times (&vms_times);
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return (vms_times.proc_user_time + vms_times.proc_system_time) * 10000;
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#else
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/* A fallback, if nothing else available. */
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return 0;
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#endif /* VMS */
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#endif /* HAVE_TIMES */
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#endif /* HAVE_GETRUSAGE */
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}
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