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)
63 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
64 internal_error (NULL, "tv_sec too small");
66 if (gettimeofday(&tp1, NULL) == 0)
68 GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
69 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
70 if (ucnt > GFC_INTEGER_4_HUGE)
71 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
74 mx = GFC_INTEGER_4_HUGE;
79 *count = - GFC_INTEGER_4_HUGE;
80 if (count_rate != NULL)
82 if (count_max != NULL)
86 #elif defined(HAVE_TIME_H)
89 if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
90 internal_error (NULL, "time_t too small");
93 if (ucnt > GFC_INTEGER_4_HUGE)
94 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
97 mx = GFC_INTEGER_4_HUGE;
99 cnt = - GFC_INTEGER_4_HUGE;
104 if (count_rate != NULL)
106 if (count_max != NULL)
111 /* INTEGER(8) version of the above routine. */
114 system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
115 GFC_INTEGER_8 *count_max)
120 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
125 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
126 internal_error (NULL, "tv_sec too small");
128 if (gettimeofday(&tp1, NULL) == 0)
130 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_8))
132 GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
133 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
134 if (ucnt > GFC_INTEGER_4_HUGE)
135 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
138 mx = GFC_INTEGER_4_HUGE;
142 GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) tp1.tv_sec * TCK;
143 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
144 if (ucnt > GFC_INTEGER_8_HUGE)
145 cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
148 mx = GFC_INTEGER_8_HUGE;
154 *count = - GFC_INTEGER_8_HUGE;
155 if (count_rate != NULL)
157 if (count_max != NULL)
162 #elif defined(HAVE_TIME_H)
163 if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
164 internal_error (NULL, "time_t too small");
165 else if (sizeof (time_t) == sizeof (GFC_INTEGER_4))
167 GFC_UINTEGER_4 ucnt = time (NULL);
168 if (ucnt > GFC_INTEGER_4_HUGE)
169 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
172 mx = GFC_INTEGER_4_HUGE;
176 GFC_UINTEGER_8 ucnt = time (NULL);
177 if (ucnt > GFC_INTEGER_8_HUGE)
178 cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
181 mx = GFC_INTEGER_8_HUGE;
184 cnt = - GFC_INTEGER_8_HUGE;
189 if (count_rate != NULL)
191 if (count_max != NULL)