| /* Implementation of the SYSTEM_CLOCK intrinsic. |
| Copyright (C) 2004, 2005 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" |
| |
| #include <limits.h> |
| |
| #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY) |
| # include <sys/time.h> |
| # define TCK 1000 |
| #elif defined(HAVE_TIME_H) |
| # include <time.h> |
| # define TCK 1 |
| #else |
| #define TCK 0 |
| #endif |
| |
| |
| #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY) |
| static struct timeval tp0 = {-1, 0}; |
| #elif defined(HAVE_TIME_H) |
| static time_t t0 = (time_t) -2; |
| #endif |
| |
| |
| extern void system_clock_4 (GFC_INTEGER_4 *, GFC_INTEGER_4 *, GFC_INTEGER_4 *); |
| export_proto(system_clock_4); |
| |
| extern void system_clock_8 (GFC_INTEGER_8 *, GFC_INTEGER_8 *, GFC_INTEGER_8 *); |
| export_proto(system_clock_8); |
| |
| |
| /* prefix(system_clock_4) is the INTEGER(4) version of the SYSTEM_CLOCK |
| intrinsic subroutine. It returns the number of clock ticks for the current |
| system time, the number of ticks per second, and the maximum possible value |
| for COUNT. On the first call to SYSTEM_CLOCK, COUNT is set to zero. */ |
| |
| void |
| system_clock_4(GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate, |
| GFC_INTEGER_4 *count_max) |
| { |
| GFC_INTEGER_4 cnt; |
| GFC_INTEGER_4 rate; |
| GFC_INTEGER_4 mx; |
| |
| #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY) |
| struct timeval tp1; |
| struct timezone tzp; |
| double t; |
| |
| if (gettimeofday(&tp1, &tzp) == 0) |
| { |
| if (tp0.tv_sec < 0) |
| { |
| tp0 = tp1; |
| cnt = 0; |
| } |
| else |
| { |
| /* TODO: Convert this to integer arithmetic. */ |
| t = (double) (tp1.tv_sec - tp0.tv_sec); |
| t += (double) (tp1.tv_usec - tp0.tv_usec) * 1.e-6; |
| t *= TCK; |
| |
| if (t > (double) GFC_INTEGER_4_HUGE) |
| { |
| /* Time has wrapped. */ |
| while (t > (double) GFC_INTEGER_4_HUGE) |
| t -= (double) GFC_INTEGER_4_HUGE; |
| tp0 = tp1; |
| } |
| cnt = (GFC_INTEGER_4) t; |
| } |
| rate = TCK; |
| mx = GFC_INTEGER_4_HUGE; |
| } |
| else |
| { |
| if (count != NULL) |
| *count = - GFC_INTEGER_4_HUGE; |
| if (count_rate != NULL) |
| *count_rate = 0; |
| if (count_max != NULL) |
| *count_max = 0; |
| return; |
| } |
| #elif defined(HAVE_TIME_H) |
| time_t t, t1; |
| |
| t1 = time(NULL); |
| |
| if (t1 == (time_t) -1) |
| { |
| cnt = - GFC_INTEGER_4_HUGE; |
| mx = 0; |
| } |
| else if (t0 == (time_t) -2) |
| t0 = t1; |
| else |
| { |
| /* The timer counts in seconts, so for simplicity assume it never wraps. |
| Even with 32-bit counters this only happens once every 68 years. */ |
| cnt = t1 - t0; |
| mx = GFC_INTEGER_4_HUGE; |
| } |
| #else |
| cnt = - GFC_INTEGER_4_HUGE; |
| mx = 0; |
| #endif |
| if (count != NULL) |
| *count = cnt; |
| if (count_rate != NULL) |
| *count_rate = TCK; |
| if (count_max != NULL) |
| *count_max = mx; |
| } |
| |
| |
| /* INTEGER(8) version of the above routine. */ |
| |
| void |
| system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate, |
| GFC_INTEGER_8 *count_max) |
| { |
| GFC_INTEGER_8 cnt; |
| GFC_INTEGER_8 rate; |
| GFC_INTEGER_8 mx; |
| |
| #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY) |
| struct timeval tp1; |
| struct timezone tzp; |
| double t; |
| |
| if (gettimeofday(&tp1, &tzp) == 0) |
| { |
| if (tp0.tv_sec < 0) |
| { |
| tp0 = tp1; |
| cnt = 0; |
| } |
| else |
| { |
| /* TODO: Convert this to integer arithmetic. */ |
| t = (double) (tp1.tv_sec - tp0.tv_sec); |
| t += (double) (tp1.tv_usec - tp0.tv_usec) * 1.e-6; |
| t *= TCK; |
| |
| if (t > (double) GFC_INTEGER_8_HUGE) |
| { |
| /* Time has wrapped. */ |
| while (t > (double) GFC_INTEGER_8_HUGE) |
| t -= (double) GFC_INTEGER_8_HUGE; |
| tp0 = tp1; |
| } |
| cnt = (GFC_INTEGER_8) t; |
| } |
| rate = TCK; |
| mx = GFC_INTEGER_8_HUGE; |
| } |
| else |
| { |
| if (count != NULL) |
| *count = - GFC_INTEGER_8_HUGE; |
| if (count_rate != NULL) |
| *count_rate = 0; |
| if (count_max != NULL) |
| *count_max = 0; |
| |
| return; |
| } |
| #elif defined(HAVE_TIME_H) |
| time_t t, t1; |
| |
| t1 = time(NULL); |
| |
| if (t1 == (time_t) -1) |
| { |
| cnt = - GFC_INTEGER_8_HUGE; |
| mx = 0; |
| } |
| else if (t0 == (time_t) -2) |
| t0 = t1; |
| else |
| { |
| /* The timer counts in seconts, so for simplicity assume it never wraps. |
| Even with 32-bit counters this only happens once every 68 years. */ |
| cnt = t1 - t0; |
| mx = GFC_INTEGER_8_HUGE; |
| } |
| #else |
| cnt = - GFC_INTEGER_8_HUGE; |
| mx = 0; |
| #endif |
| if (count != NULL) |
| *count = cnt; |
| if (count_rate != NULL) |
| *count_rate = TCK; |
| if (count_max != NULL) |
| *count_max = mx; |
| } |