1 /* Implementation of the SYSTEM_CLOCK intrinsic.
2 Copyright (C) 2004, 2005 Free Software Foundation, Inc.
4 This file is part of the GNU Fortran 95 runtime library (libgfortran).
6 Libgfortran is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
11 In addition to the permissions in the GNU General Public License, the
12 Free Software Foundation gives you unlimited permission to link the
13 compiled version of this file into combinations with other programs,
14 and to distribute those combinations without any restriction coming
15 from the use of this file. (The General Public License restrictions
16 do apply in other respects; for example, they cover modification of
17 the file, and distribution when not linked into a combine
20 Libgfortran is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 GNU General Public License for more details.
25 You should have received a copy of the GNU General Public
26 License along with libgfortran; see the file COPYING. If not,
27 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
28 Boston, MA 02110-1301, USA. */
31 #include "libgfortran.h"
35 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
36 # include <sys/time.h>
38 #elif defined(HAVE_TIME_H)
46 extern void system_clock_4 (GFC_INTEGER_4 *, GFC_INTEGER_4 *, GFC_INTEGER_4 *);
47 export_proto(system_clock_4);
49 extern void system_clock_8 (GFC_INTEGER_8 *, GFC_INTEGER_8 *, GFC_INTEGER_8 *);
50 export_proto(system_clock_8);
53 /* prefix(system_clock_4) is the INTEGER(4) version of the SYSTEM_CLOCK
54 intrinsic subroutine. It returns the number of clock ticks for the current
55 system time, the number of ticks per second, and the maximum possible value
56 for COUNT. On the first call to SYSTEM_CLOCK, COUNT is set to zero. */
59 system_clock_4(GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
60 GFC_INTEGER_4 *count_max)
66 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
70 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
71 internal_error (NULL, "tv_sec too small");
73 if (gettimeofday(&tp1, &tzp) == 0)
75 GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
76 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
77 if (ucnt > GFC_INTEGER_4_HUGE)
78 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
82 mx = GFC_INTEGER_4_HUGE;
87 *count = - GFC_INTEGER_4_HUGE;
88 if (count_rate != NULL)
90 if (count_max != NULL)
94 #elif defined(HAVE_TIME_H)
97 if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
98 internal_error (NULL, "time_t too small");
101 if (ucnt > GFC_INTEGER_4_HUGE)
102 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
105 mx = GFC_INTEGER_4_HUGE;
107 cnt = - GFC_INTEGER_4_HUGE;
112 if (count_rate != NULL)
114 if (count_max != NULL)
119 /* INTEGER(8) version of the above routine. */
122 system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
123 GFC_INTEGER_8 *count_max)
129 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
133 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
134 internal_error (NULL, "tv_sec too small");
136 if (gettimeofday(&tp1, &tzp) == 0)
138 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_8))
140 GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
141 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
142 if (ucnt > GFC_INTEGER_4_HUGE)
143 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
146 mx = GFC_INTEGER_4_HUGE;
150 GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) tp1.tv_sec * TCK;
151 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
152 if (ucnt > GFC_INTEGER_8_HUGE)
153 cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
156 mx = GFC_INTEGER_8_HUGE;
163 *count = - GFC_INTEGER_8_HUGE;
164 if (count_rate != NULL)
166 if (count_max != NULL)
171 #elif defined(HAVE_TIME_H)
172 if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
173 internal_error (NULL, "time_t too small");
174 else if (sizeof (time_t) == sizeof (GFC_INTEGER_4))
176 GFC_UINTEGER_4 ucnt = time (NULL);
177 if (ucnt > GFC_INTEGER_4_HUGE)
178 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
181 mx = GFC_INTEGER_4_HUGE;
185 GFC_UINTEGER_8 ucnt = time (NULL);
186 if (ucnt > GFC_INTEGER_8_HUGE)
187 cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
190 mx = GFC_INTEGER_8_HUGE;
193 cnt = - GFC_INTEGER_8_HUGE;
198 if (count_rate != NULL)
200 if (count_max != NULL)