| /* Return time used so far, in microseconds. |
| Copyright (C) 1994-2021 Free Software Foundation, Inc. |
| |
| This file is part of the libiberty library. |
| Libiberty 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. |
| |
| Libiberty 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 libiberty; see the file COPYING.LIB. If |
| not, 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 is |
| the time used by this process, else it is the elapsed time since the |
| process started. |
| |
| @end deftypefn |
| |
| */ |
| |
| long |
| get_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 */ |
| } |