/* Return time used so far, in microseconds.   Copyright (C) 1994-2026 Free Software Foundation, Inc. This file is part of the libiberty library.Libiberty is free software; you can redistribute it and/ormodify it under the terms of the GNU Library General PublicLicense as published by the Free Software Foundation; eitherversion 2 of the License, or (at your option) any later version. Libiberty is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNULibrary General Public License for more details. You should have received a copy of the GNU Library General PublicLicense along with libiberty; see the file COPYING.LIB.  Ifnot, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,Boston, MA 02110-1301, USA.  */ #include "config.h" #include "ansidecl.h"#include "libiberty.h" /* On some systems (such as WindISS), you must include <sys/types.h>   to get the definition of "time_t" before you include <time.h>.  */#include <sys/types.h> /* There are several ways to get elapsed execution time; unfortunately no   single way is available for all host systems, nor are there reliable   ways to find out which way is correct for a given host. */ #ifdef TIME_WITH_SYS_TIME# include <sys/time.h># include <time.h>#else# if HAVE_SYS_TIME_H#  include <sys/time.h># else#  ifdef HAVE_TIME_H#   include <time.h>#  endif# endif#endif #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)#include <sys/resource.h>#endif #ifdef HAVE_TIMES#ifdef HAVE_SYS_PARAM_H#include <sys/param.h>#endif#include <sys/times.h>#endif #ifdef HAVE_UNISTD_H#include <unistd.h>#endif /* This is a fallback; if wrong, it will likely make obviously wrong   results. */ #ifndef CLOCKS_PER_SEC#define CLOCKS_PER_SEC 1#endif #ifndef RUSAGE_SELF#define RUSAGE_SELF 0#endif #ifdef _SC_CLK_TCK#define GNU_HZ  sysconf(_SC_CLK_TCK)#else#ifdef HZ#define GNU_HZ  HZ#else#ifdef CLOCKS_PER_SEC#define GNU_HZ  CLOCKS_PER_SEC#endif#endif#endif /* @deftypefn Replacement long get_run_time (void) Returns the time used so far, in microseconds.  If possible, this isthe time used by this process, else it is the elapsed time since theprocess started. @end deftypefn */ longget_run_time (void){#if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H)  struct rusage rusage;   getrusage (RUSAGE_SELF, &rusage);  return (rusage.ru_utime.tv_sec * 1000000 + rusage.ru_utime.tv_usec	  + rusage.ru_stime.tv_sec * 1000000 + rusage.ru_stime.tv_usec);#else /* ! HAVE_GETRUSAGE */#ifdef HAVE_TIMES  struct tms tms;   times (&tms);  return (tms.tms_utime + tms.tms_stime) * (1000000 / GNU_HZ);#else /* ! HAVE_TIMES */  /* Fall back on clock and hope it's correctly implemented. */  const long clocks_per_sec = CLOCKS_PER_SEC;  if (clocks_per_sec <= 1000000)    return clock () * (1000000 / clocks_per_sec);  else    return clock () / clocks_per_sec;#endif  /* HAVE_TIMES */#endif  /* HAVE_GETRUSAGE */}