| /* Implementation of the CPU_TIME intrinsic. |
| Copyright (C) 2003 Free Software Foundation, Inc. |
| |
| This file is part of the GNU Fortran 95 runtime library (libgfortran). |
| |
| Libgfortran is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| In addition to the permissions in the GNU General Public License, the |
| Free Software Foundation gives you unlimited permission to link the |
| compiled version of this file into combinations with other programs, |
| and to distribute those combinations without any restriction coming |
| from the use of this file. (The General Public License restrictions |
| do apply in other respects; for example, they cover modification of |
| the file, and distribution when not linked into a combine |
| executable.) |
| |
| Libgfortran 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public |
| License along with libgfortran; see the file COPYING. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "config.h" |
| #include <sys/types.h> |
| #include "libgfortran.h" |
| |
| #ifdef HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| |
| /* The CPU_TIME intrinsic to "compare different algorithms on the same |
| computer or discover which parts are the most expensive", so we |
| need a way to get the CPU time with the finest resolution possible. |
| We can only be accurate up to microseconds. |
| |
| As usual with UNIX systems, unfortunately no single way is |
| available for all systems. */ |
| |
| #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 |
| |
| /* The most accurate way to get the CPU time is getrusage (). |
| If we have times(), that's good enough, too. */ |
| #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) |
| # include <sys/resource.h> |
| #else |
| /* For times(), we _must_ know the number of clock ticks per second. */ |
| # if defined (HAVE_TIMES) && (defined (HZ) || defined (_SC_CLK_TCK) || defined (CLK_TCK)) |
| # ifdef HAVE_SYS_PARAM_H |
| # include <sys/param.h> |
| # endif |
| # include <sys/times.h> |
| # ifndef HZ |
| # if defined _SC_CLK_TCK |
| # define HZ sysconf(_SC_CLK_TCK) |
| # else |
| # define HZ CLK_TCK |
| # endif |
| # endif |
| # endif /* HAVE_TIMES etc. */ |
| #endif /* HAVE_GETRUSAGE && HAVE_SYS_RESOURCE_H */ |
| |
| #if defined (__GNUC__) && (__GNUC__ >= 3) |
| # define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__)) |
| #else |
| # define ATTRIBUTE_ALWAYS_INLINE |
| #endif |
| |
| static inline void __cpu_time_1 (long *, long *) ATTRIBUTE_ALWAYS_INLINE; |
| |
| /* Helper function for the actual implementation of the CPU_TIME |
| intrnsic. Returns a CPU time in microseconds or -1 if no CPU time |
| could be computed. */ |
| static inline void |
| __cpu_time_1 (long *sec, long *usec) |
| { |
| #if defined (HAVE_GETRUSAGE) && defined (HAVE_SYS_RESOURCE_H) |
| struct rusage usage; |
| getrusage (0, &usage); |
| *sec = usage.ru_utime.tv_sec + usage.ru_stime.tv_sec; |
| *usec = usage.ru_utime.tv_usec + usage.ru_stime.tv_usec; |
| #else /* ! HAVE_GETRUSAGE || ! HAVE_SYS_RESOURCE_H */ |
| #ifdef HAVE_TIMES |
| struct tms buf; |
| times (&buf); |
| *sec = 0; |
| *usec = (buf.tms_utime + buf.tms_stime) * (1000000 / HZ); |
| #else /* ! HAVE_TIMES */ |
| /* We have nothing to go on. Return -1. */ |
| *sec = -1; |
| *usec = 0; |
| #endif /* HAVE_TIMES */ |
| #endif /* HAVE_GETRUSAGE */ |
| } |
| |
| extern void cpu_time_4 (GFC_REAL_4 *); |
| iexport_proto(cpu_time_4); |
| |
| void cpu_time_4 (GFC_REAL_4 *time) |
| { |
| long sec, usec; |
| __cpu_time_1 (&sec, &usec); |
| *time = sec + usec * (GFC_REAL_4)1.e-6; |
| } |
| iexport(cpu_time_4); |
| |
| extern void cpu_time_8 (GFC_REAL_8 *); |
| export_proto(cpu_time_8); |
| |
| void cpu_time_8 (GFC_REAL_8 *time) |
| { |
| long sec, usec; |
| __cpu_time_1 (&sec, &usec); |
| *time = sec + usec * (GFC_REAL_8)1.e-6; |
| } |
| |
| extern void second_sub (GFC_REAL_4 *); |
| export_proto(second_sub); |
| |
| void |
| second_sub (GFC_REAL_4 *s) |
| { |
| cpu_time_4 (s); |
| } |
| |
| extern GFC_REAL_4 second (void); |
| export_proto(second); |
| |
| GFC_REAL_4 |
| second (void) |
| { |
| GFC_REAL_4 s; |
| cpu_time_4 (&s); |
| return s; |
| } |