1 /* Implementation of the SYSTEM_CLOCK intrinsic.
2 Copyright (C) 2004, 2005, 2007, 2009 Free Software Foundation, Inc.
4 This file is part of the GNU Fortran 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 3 of the License, or (at your option) any later version.
11 Libgfortran is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
25 #include "libgfortran.h"
29 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
30 # include <sys/time.h>
31 #elif defined(HAVE_TIME_H)
39 extern void system_clock_4 (GFC_INTEGER_4 *, GFC_INTEGER_4 *, GFC_INTEGER_4 *);
40 export_proto(system_clock_4);
42 extern void system_clock_8 (GFC_INTEGER_8 *, GFC_INTEGER_8 *, GFC_INTEGER_8 *);
43 export_proto(system_clock_8);
46 /* prefix(system_clock_4) is the INTEGER(4) version of the SYSTEM_CLOCK
47 intrinsic subroutine. It returns the number of clock ticks for the current
48 system time, the number of ticks per second, and the maximum possible value
49 for COUNT. On the first call to SYSTEM_CLOCK, COUNT is set to zero. */
52 system_clock_4(GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
53 GFC_INTEGER_4 *count_max)
58 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
62 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
63 internal_error (NULL, "tv_sec too small");
65 if (gettimeofday(&tp1, NULL) == 0)
67 GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
68 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
69 if (ucnt > GFC_INTEGER_4_HUGE)
70 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
73 mx = GFC_INTEGER_4_HUGE;
78 *count = - GFC_INTEGER_4_HUGE;
79 if (count_rate != NULL)
81 if (count_max != NULL)
85 #elif defined(HAVE_TIME_H)
88 if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
89 internal_error (NULL, "time_t too small");
92 if (ucnt > GFC_INTEGER_4_HUGE)
93 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
96 mx = GFC_INTEGER_4_HUGE;
98 cnt = - GFC_INTEGER_4_HUGE;
103 if (count_rate != NULL)
105 if (count_max != NULL)
110 /* INTEGER(8) version of the above routine. */
113 system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
114 GFC_INTEGER_8 *count_max)
119 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
123 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
124 internal_error (NULL, "tv_sec too small");
126 if (gettimeofday(&tp1, NULL) == 0)
128 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_8))
130 GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
131 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
132 if (ucnt > GFC_INTEGER_4_HUGE)
133 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
136 mx = GFC_INTEGER_4_HUGE;
140 GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) tp1.tv_sec * TCK;
141 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
142 if (ucnt > GFC_INTEGER_8_HUGE)
143 cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
146 mx = GFC_INTEGER_8_HUGE;
152 *count = - GFC_INTEGER_8_HUGE;
153 if (count_rate != NULL)
155 if (count_max != NULL)
160 #elif defined(HAVE_TIME_H)
161 if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
162 internal_error (NULL, "time_t too small");
163 else if (sizeof (time_t) == sizeof (GFC_INTEGER_4))
165 GFC_UINTEGER_4 ucnt = time (NULL);
166 if (ucnt > GFC_INTEGER_4_HUGE)
167 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
170 mx = GFC_INTEGER_4_HUGE;
174 GFC_UINTEGER_8 ucnt = time (NULL);
175 if (ucnt > GFC_INTEGER_8_HUGE)
176 cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
179 mx = GFC_INTEGER_8_HUGE;
182 cnt = - GFC_INTEGER_8_HUGE;
187 if (count_rate != NULL)
189 if (count_max != NULL)