1 /* Implementation of the SYSTEM_CLOCK intrinsic.
2 Copyright (C) 2004, 2005, 2007 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. */
30 #include "libgfortran.h"
34 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
35 # include <sys/time.h>
37 #elif defined(HAVE_TIME_H)
45 extern void system_clock_4 (GFC_INTEGER_4 *, GFC_INTEGER_4 *, GFC_INTEGER_4 *);
46 export_proto(system_clock_4);
48 extern void system_clock_8 (GFC_INTEGER_8 *, GFC_INTEGER_8 *, GFC_INTEGER_8 *);
49 export_proto(system_clock_8);
52 /* prefix(system_clock_4) is the INTEGER(4) version of the SYSTEM_CLOCK
53 intrinsic subroutine. It returns the number of clock ticks for the current
54 system time, the number of ticks per second, and the maximum possible value
55 for COUNT. On the first call to SYSTEM_CLOCK, COUNT is set to zero. */
58 system_clock_4(GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
59 GFC_INTEGER_4 *count_max)
64 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
68 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
69 internal_error (NULL, "tv_sec too small");
71 if (gettimeofday(&tp1, &tzp) == 0)
73 GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
74 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
75 if (ucnt > GFC_INTEGER_4_HUGE)
76 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
79 mx = GFC_INTEGER_4_HUGE;
84 *count = - GFC_INTEGER_4_HUGE;
85 if (count_rate != NULL)
87 if (count_max != NULL)
91 #elif defined(HAVE_TIME_H)
94 if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
95 internal_error (NULL, "time_t too small");
98 if (ucnt > GFC_INTEGER_4_HUGE)
99 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
102 mx = GFC_INTEGER_4_HUGE;
104 cnt = - GFC_INTEGER_4_HUGE;
109 if (count_rate != NULL)
111 if (count_max != NULL)
116 /* INTEGER(8) version of the above routine. */
119 system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
120 GFC_INTEGER_8 *count_max)
125 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_GETTIMEOFDAY)
129 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_4))
130 internal_error (NULL, "tv_sec too small");
132 if (gettimeofday(&tp1, &tzp) == 0)
134 if (sizeof (tp1.tv_sec) < sizeof (GFC_INTEGER_8))
136 GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) tp1.tv_sec * TCK;
137 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
138 if (ucnt > GFC_INTEGER_4_HUGE)
139 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
142 mx = GFC_INTEGER_4_HUGE;
146 GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) tp1.tv_sec * TCK;
147 ucnt += (tp1.tv_usec + 500000 / TCK) / (1000000 / TCK);
148 if (ucnt > GFC_INTEGER_8_HUGE)
149 cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
152 mx = GFC_INTEGER_8_HUGE;
158 *count = - GFC_INTEGER_8_HUGE;
159 if (count_rate != NULL)
161 if (count_max != NULL)
166 #elif defined(HAVE_TIME_H)
167 if (sizeof (time_t) < sizeof (GFC_INTEGER_4))
168 internal_error (NULL, "time_t too small");
169 else if (sizeof (time_t) == sizeof (GFC_INTEGER_4))
171 GFC_UINTEGER_4 ucnt = time (NULL);
172 if (ucnt > GFC_INTEGER_4_HUGE)
173 cnt = ucnt - GFC_INTEGER_4_HUGE - 1;
176 mx = GFC_INTEGER_4_HUGE;
180 GFC_UINTEGER_8 ucnt = time (NULL);
181 if (ucnt > GFC_INTEGER_8_HUGE)
182 cnt = ucnt - GFC_INTEGER_8_HUGE - 1;
185 mx = GFC_INTEGER_8_HUGE;
188 cnt = - GFC_INTEGER_8_HUGE;
193 if (count_rate != NULL)
195 if (count_max != NULL)