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
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
|
/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
ngx_msec_t ngx_current_time;
ngx_int_t ngx_gmtoff;
static ngx_tm_t ngx_cached_gmtime;
/*
* In the threaded mode only one thread updates the cached time and strings
* and these operations are protected by the mutex. The reading of the cached
* time and strings is not protected by the mutex. To avoid the race
* conditions for non-atomic values we use the NGX_TIME_SLOTS slots to store
* time value and strings. Thus thread may get the corrupted values only
* if it is preempted while copying and then it is not scheduled to run
* more than NGX_TIME_SLOTS seconds.
*/
#if (NGX_THREADS)
#define NGX_TIME_SLOTS 60
static ngx_uint_t slot = NGX_TIME_SLOTS;
static ngx_mutex_t *ngx_time_mutex;
#else
#define NGX_TIME_SLOTS 1
#define slot 0
#endif
#if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
volatile time_t *ngx_cached_time;
static time_t cached_time[NGX_TIME_SLOTS];
#else
volatile time_t ngx_cached_time;
#endif
ngx_thread_volatile ngx_str_t ngx_cached_err_log_time;
ngx_thread_volatile ngx_str_t ngx_cached_http_time;
ngx_thread_volatile ngx_str_t ngx_cached_http_log_time;
static u_char cached_err_log_time[NGX_TIME_SLOTS]
[sizeof("1970/09/28 12:00:00")];
static u_char cached_http_time[NGX_TIME_SLOTS]
[sizeof("Mon, 28 Sep 1970 06:00:00 GMT")];
static u_char cached_http_log_time[NGX_TIME_SLOTS]
[sizeof("28/Sep/1970:12:00:00 +0600")];
static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
void
ngx_time_init(void)
{
struct timeval tv;
ngx_memzero(&ngx_cached_gmtime, sizeof(ngx_tm_t));
#ifdef ngx_tm_zone
ngx_cached_gmtime.ngx_tm_zone = "GMT";
#endif
ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1;
ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1;
ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1;
#if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
ngx_cached_time = &cached_time[0];
#endif
ngx_gettimeofday(&tv);
ngx_current_time = (ngx_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
#if !(NGX_WIN32)
tzset();
#endif
ngx_time_update(tv.tv_sec);
}
#if (NGX_THREADS)
ngx_int_t
ngx_time_mutex_init(ngx_log_t *log)
{
ngx_time_mutex = ngx_mutex_init(log, NGX_MUTEX_LIGHT);
if (ngx_time_mutex == NULL) {
return NGX_ERROR;
}
return NGX_OK;
}
#endif
void
ngx_time_update(time_t s)
{
u_char *p;
ngx_tm_t tm;
if (ngx_time() == s) {
return;
}
#if (NGX_THREADS)
if (ngx_mutex_trylock(ngx_time_mutex) != NGX_OK) {
return;
}
if (slot == NGX_TIME_SLOTS) {
slot = 0;
} else {
slot++;
}
#if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE))
ngx_cached_time = &cached_time[slot];
#endif
#endif
ngx_time() = s;
ngx_gmtime(s, &ngx_cached_gmtime);
p = cached_http_time[slot];
(void) ngx_sprintf(p, "%s, %02d %s %4d %02d:%02d:%02d GMT",
week[ngx_cached_gmtime.ngx_tm_wday],
ngx_cached_gmtime.ngx_tm_mday,
months[ngx_cached_gmtime.ngx_tm_mon - 1],
ngx_cached_gmtime.ngx_tm_year,
ngx_cached_gmtime.ngx_tm_hour,
ngx_cached_gmtime.ngx_tm_min,
ngx_cached_gmtime.ngx_tm_sec);
ngx_cached_http_time.data = p;
#if (NGX_HAVE_GETTIMEZONE)
ngx_gmtoff = ngx_gettimezone();
ngx_gmtime(s + ngx_gmtoff * 60, &tm);
#elif (NGX_HAVE_GMTOFF)
ngx_localtime(&tm);
ngx_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60);
#else
ngx_localtime(&tm);
ngx_gmtoff = ngx_timezone(tm.ngx_tm_isdst);
#endif
p = cached_err_log_time[slot];
(void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d",
tm.ngx_tm_year, tm.ngx_tm_mon,
tm.ngx_tm_mday, tm.ngx_tm_hour,
tm.ngx_tm_min, tm.ngx_tm_sec);
ngx_cached_err_log_time.data = p;
p = cached_http_log_time[slot];
(void) ngx_sprintf(p, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d",
tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1],
tm.ngx_tm_year, tm.ngx_tm_hour,
tm.ngx_tm_min, tm.ngx_tm_sec,
ngx_gmtoff < 0 ? '-' : '+',
abs(ngx_gmtoff / 60), abs(ngx_gmtoff % 60));
ngx_cached_http_log_time.data = p;
#if (NGX_THREADS)
ngx_mutex_unlock(ngx_time_mutex);
#endif
}
u_char *
ngx_http_time(u_char *buf, time_t t)
{
ngx_tm_t tm;
ngx_gmtime(t, &tm);
return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT",
week[tm.ngx_tm_wday],
tm.ngx_tm_mday,
months[tm.ngx_tm_mon - 1],
tm.ngx_tm_year,
tm.ngx_tm_hour,
tm.ngx_tm_min,
tm.ngx_tm_sec);
}
u_char *
ngx_http_cookie_time(u_char *buf, time_t t)
{
ngx_tm_t tm;
ngx_gmtime(t, &tm);
/*
* Netscape 3.x does not understand 4-digit years at all and
* 2-digit years more than "37"
*/
return ngx_sprintf(buf,
(tm.ngx_tm_year > 2037) ?
"%s, %02d-%s-%d %02d:%02d:%02d GMT":
"%s, %02d-%s-%02d %02d:%02d:%02d GMT",
week[tm.ngx_tm_wday],
tm.ngx_tm_mday,
months[tm.ngx_tm_mon - 1],
(tm.ngx_tm_year > 2037) ? tm.ngx_tm_year:
tm.ngx_tm_year % 100,
tm.ngx_tm_hour,
tm.ngx_tm_min,
tm.ngx_tm_sec);
}
void
ngx_gmtime(time_t t, ngx_tm_t *tp)
{
ngx_int_t sec, min, hour, mday, mon, year, wday, yday, days;
days = t / 86400;
/* Jaunary 1, 1970 was Thursday */
wday = (4 + days) % 7;
t %= 86400;
hour = t / 3600;
t %= 3600;
min = t / 60;
sec = t % 60;
/* the algorithm based on Gauss's formula */
days = days - (31 + 28) + 719527;
year = days * 400 / (365 * 400 + 100 - 4 + 1);
yday = days - (365 * year + year / 4 - year / 100 + year / 400);
mon = (yday + 31) * 12 / 367;
mday = yday - (mon * 367 / 12 - 31);
mon += 2;
if (yday >= 306) {
/*
* there is no "yday" in Win32 SYSTEMTIME
*
* yday -= 306;
*/
year++;
mon -= 12;
if (mday == 0) {
/* Jaunary 31 */
mon = 1;
mday = 31;
} else if (mon == 2) {
if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
if (mday > 29) {
mon = 3;
mday -= 29;
}
} else if (mday > 28) {
mon = 3;
mday -= 28;
}
}
/*
* there is no "yday" in Win32 SYSTEMTIME
*
* } else {
* yday += 31 + 28;
*
* if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) {
* yday++;
* }
*/
}
tp->ngx_tm_sec = (ngx_tm_sec_t) sec;
tp->ngx_tm_min = (ngx_tm_min_t) min;
tp->ngx_tm_hour = (ngx_tm_hour_t) hour;
tp->ngx_tm_mday = (ngx_tm_mday_t) mday;
tp->ngx_tm_mon = (ngx_tm_mon_t) mon;
tp->ngx_tm_year = (ngx_tm_year_t) year;
tp->ngx_tm_wday = (ngx_tm_wday_t) wday;
}
|
