1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/* Implementation of the SYSTEM_CLOCK intrinsic.
Copyright (C) 2004-2020 Free Software Foundation, Inc.
This file is part of the GNU Fortran 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 3 of the License, or (at your option) any later version.
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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libgfortran.h"
#include <limits.h>
#include "time_1.h"
#if !defined(__MINGW32__)
/* POSIX states that CLOCK_REALTIME must be present if clock_gettime
is available, others are optional. */
#if defined(HAVE_CLOCK_GETTIME) || defined(HAVE_CLOCK_GETTIME_LIBRT)
#if defined(CLOCK_MONOTONIC) && defined(_POSIX_MONOTONIC_CLOCK) \
&& _POSIX_MONOTONIC_CLOCK >= 0
#define GF_CLOCK_MONOTONIC CLOCK_MONOTONIC
#else
#define GF_CLOCK_MONOTONIC CLOCK_REALTIME
#endif
#endif
/* Weakref trickery for clock_gettime(). On Glibc <= 2.16,
clock_gettime() requires us to link in librt, which also pulls in
libpthread. In order to avoid this by default, only call
clock_gettime() through a weak reference. */
#if SUPPORTS_WEAKREF && defined(HAVE_CLOCK_GETTIME_LIBRT)
static int weak_gettime (clockid_t, struct timespec *)
__attribute__((__weakref__("clock_gettime")));
#endif
/* High resolution monotonic clock, falling back to the realtime clock
if the target does not support such a clock.
Arguments:
secs - OUTPUT, seconds
fracsecs - OUTPUT, fractional seconds, units given by tk argument
tk - OUTPUT, clock resolution [counts/sec]
If the target supports a monotonic clock, the OUTPUT arguments
represent a monotonically incrementing clock starting from some
unspecified time in the past.
If a monotonic clock is not available, falls back to the realtime
clock which is not monotonic.
Return value: 0 for success, -1 for error. In case of error, errno
is set.
*/
static int
gf_gettime_mono (time_t * secs, long * fracsecs, long * tck)
{
int err;
#ifdef HAVE_CLOCK_GETTIME
struct timespec ts;
*tck = 1000000000;
err = clock_gettime (GF_CLOCK_MONOTONIC, &ts);
*secs = ts.tv_sec;
*fracsecs = ts.tv_nsec;
return err;
#else
#if SUPPORTS_WEAKREF && defined(HAVE_CLOCK_GETTIME_LIBRT)
if (weak_gettime)
{
struct timespec ts;
*tck = 1000000000;
err = weak_gettime (GF_CLOCK_MONOTONIC, &ts);
*secs = ts.tv_sec;
*fracsecs = ts.tv_nsec;
return err;
}
#endif
*tck = 1000000;
err = gf_gettime (secs, fracsecs);
return err;
#endif
}
#endif /* !__MINGW32__ */
extern void
system_clock_4 (GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
GFC_INTEGER_4 *count_max);
export_proto(system_clock_4);
extern void
system_clock_8 (GFC_INTEGER_8 *count, GFC_INTEGER_8 *count_rate,
GFC_INTEGER_8 *count_max);
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. */
void
system_clock_4 (GFC_INTEGER_4 *count, GFC_INTEGER_4 *count_rate,
GFC_INTEGER_4 *count_max)
{
#if defined(__MINGW32__)
if (count)
{
/* Use GetTickCount here as the resolution and range is
sufficient for the INTEGER(kind=4) version, and
QueryPerformanceCounter has potential issues. */
uint32_t cnt = GetTickCount ();
if (cnt > GFC_INTEGER_4_HUGE)
cnt = cnt - GFC_INTEGER_4_HUGE - 1;
*count = cnt;
}
if (count_rate)
*count_rate = 1000;
if (count_max)
*count_max = GFC_INTEGER_4_HUGE;
#else
time_t secs;
long fracsecs, tck;
if (gf_gettime_mono (&secs, &fracsecs, &tck) == 0)
{
long tck_out = tck > 1000 ? 1000 : tck;
long tck_r = tck / tck_out;
GFC_UINTEGER_4 ucnt = (GFC_UINTEGER_4) secs * tck_out;
ucnt += fracsecs / tck_r;
if (ucnt > GFC_INTEGER_4_HUGE)
ucnt = ucnt - GFC_INTEGER_4_HUGE - 1;
if (count)
*count = ucnt;
if (count_rate)
*count_rate = tck_out;
if (count_max)
*count_max = GFC_INTEGER_4_HUGE;
}
else
{
if (count)
*count = - GFC_INTEGER_4_HUGE;
if (count_rate)
*count_rate = 0;
if (count_max)
*count_max = 0;
}
#endif
}
/* 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)
{
#if defined(__MINGW32__)
LARGE_INTEGER cnt;
LARGE_INTEGER freq;
bool fail = false;
if (count && !QueryPerformanceCounter (&cnt))
fail = true;
if (count_rate && !QueryPerformanceFrequency (&freq))
fail = true;
if (fail)
{
if (count)
*count = - GFC_INTEGER_8_HUGE;
if (count_rate)
*count_rate = 0;
if (count_max)
*count_max = 0;
}
else
{
if (count)
*count = cnt.QuadPart;
if (count_rate)
*count_rate = freq.QuadPart;
if (count_max)
*count_max = GFC_INTEGER_8_HUGE;
}
#else
time_t secs;
long fracsecs, tck;
if (gf_gettime_mono (&secs, &fracsecs, &tck) == 0)
{
GFC_UINTEGER_8 ucnt = (GFC_UINTEGER_8) secs * tck;
ucnt += fracsecs;
if (ucnt > GFC_INTEGER_8_HUGE)
ucnt = ucnt - GFC_INTEGER_8_HUGE - 1;
if (count)
*count = ucnt;
if (count_rate)
*count_rate = tck;
if (count_max)
*count_max = GFC_INTEGER_8_HUGE;
}
else
{
if (count)
*count = - GFC_INTEGER_8_HUGE;
if (count_rate)
*count_rate = 0;
if (count_max)
*count_max = 0;
}
#endif
}
|
