Mercurial > hg > nginx-ranges
comparison src/core/ngx_times.c @ 0:f0b350454894 NGINX_0_1_0
nginx 0.1.0
*) The first public version.
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 04 Oct 2004 00:00:00 +0400 |
parents | |
children | 4b2dafa26fe2 |
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-1:000000000000 | 0:f0b350454894 |
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1 | |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 | |
10 | |
11 ngx_epoch_msec_t ngx_elapsed_msec; | |
12 ngx_epoch_msec_t ngx_old_elapsed_msec; | |
13 ngx_epoch_msec_t ngx_start_msec; | |
14 | |
15 static ngx_tm_t ngx_cached_gmtime; | |
16 static ngx_int_t ngx_gmtoff; | |
17 | |
18 | |
19 /* | |
20 * In the threaded mode only one thread updates the cached time and strings | |
21 * and these operations are protected by the mutex. The reading of the cached | |
22 * time and strings is not protected by the mutex. To avoid the race | |
23 * conditions for non-atomic values we use the NGX_TIME_SLOTS slots to store | |
24 * time value and strings. Thus thread may get the corrupted values only | |
25 * if it is preempted while copying and then it is not scheduled to run | |
26 * more than NGX_TIME_SLOTS seconds. | |
27 */ | |
28 | |
29 #if (NGX_THREADS) | |
30 | |
31 #define NGX_TIME_SLOTS 60 | |
32 static ngx_uint_t slot = NGX_TIME_SLOTS; | |
33 | |
34 static ngx_mutex_t *ngx_time_mutex; | |
35 | |
36 #else | |
37 | |
38 #define NGX_TIME_SLOTS 1 | |
39 #define slot 0 | |
40 | |
41 #endif | |
42 | |
43 | |
44 #if (NGX_THREADS && (TIME_T_SIZE > SIG_ATOMIC_T_SIZE)) | |
45 | |
46 volatile time_t *ngx_cached_time; | |
47 static time_t cached_time[NGX_TIME_SLOTS]; | |
48 | |
49 #else | |
50 | |
51 volatile time_t ngx_cached_time; | |
52 | |
53 #endif | |
54 | |
55 | |
56 ngx_thread_volatile ngx_str_t ngx_cached_err_log_time; | |
57 ngx_thread_volatile ngx_str_t ngx_cached_http_time; | |
58 ngx_thread_volatile ngx_str_t ngx_cached_http_log_time; | |
59 | |
60 | |
61 static u_char cached_err_log_time[NGX_TIME_SLOTS] | |
62 [sizeof("1970/09/28 12:00:00")]; | |
63 static u_char cached_http_time[NGX_TIME_SLOTS] | |
64 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; | |
65 static u_char cached_http_log_time[NGX_TIME_SLOTS] | |
66 [sizeof("28/Sep/1970:12:00:00 +0600")]; | |
67 | |
68 | |
69 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; | |
70 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
71 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; | |
72 | |
73 | |
74 void ngx_time_init() | |
75 { | |
76 struct timeval tv; | |
77 | |
78 ngx_memzero(&ngx_cached_gmtime, sizeof(ngx_tm_t)); | |
79 #ifdef ngx_tm_zone | |
80 ngx_cached_gmtime.ngx_tm_zone = "GMT"; | |
81 #endif | |
82 | |
83 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; | |
84 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; | |
85 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; | |
86 | |
87 #if (NGX_THREADS && (TIME_T_SIZE > SIG_ATOMIC_T_SIZE)) | |
88 ngx_cached_time = &cached_time[0]; | |
89 #endif | |
90 | |
91 ngx_gettimeofday(&tv); | |
92 | |
93 ngx_start_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000; | |
94 ngx_old_elapsed_msec = 0; | |
95 ngx_elapsed_msec = 0; | |
96 | |
97 #if !(WIN32) | |
98 tzset(); | |
99 #endif | |
100 | |
101 ngx_time_update(tv.tv_sec); | |
102 } | |
103 | |
104 | |
105 #if (NGX_THREADS) | |
106 | |
107 ngx_int_t ngx_time_mutex_init(ngx_log_t *log) | |
108 { | |
109 if (!(ngx_time_mutex = ngx_mutex_init(log, NGX_MUTEX_LIGHT))) { | |
110 return NGX_ERROR; | |
111 } | |
112 | |
113 return NGX_OK; | |
114 } | |
115 | |
116 #endif | |
117 | |
118 | |
119 void ngx_time_update(time_t s) | |
120 { | |
121 u_char *p; | |
122 ngx_tm_t tm; | |
123 | |
124 if (ngx_time() == s) { | |
125 return; | |
126 } | |
127 | |
128 #if (NGX_THREADS) | |
129 | |
130 if (ngx_mutex_trylock(ngx_time_mutex) != NGX_OK) { | |
131 return; | |
132 } | |
133 | |
134 if (slot == NGX_TIME_SLOTS) { | |
135 slot = 0; | |
136 } else { | |
137 slot++; | |
138 } | |
139 | |
140 #if (NGX_THREADS && (TIME_T_SIZE > SIG_ATOMIC_T_SIZE)) | |
141 ngx_cached_time = &cached_time[slot]; | |
142 #endif | |
143 | |
144 #endif | |
145 | |
146 ngx_time() = s; | |
147 | |
148 ngx_gmtime(s, &ngx_cached_gmtime); | |
149 | |
150 | |
151 p = cached_http_time[slot]; | |
152 | |
153 ngx_snprintf((char *) p, sizeof("Mon, 28 Sep 1970 06:00:00 GMT"), | |
154 "%s, %02d %s %4d %02d:%02d:%02d GMT", | |
155 week[ngx_cached_gmtime.ngx_tm_wday], | |
156 ngx_cached_gmtime.ngx_tm_mday, | |
157 months[ngx_cached_gmtime.ngx_tm_mon - 1], | |
158 ngx_cached_gmtime.ngx_tm_year, | |
159 ngx_cached_gmtime.ngx_tm_hour, | |
160 ngx_cached_gmtime.ngx_tm_min, | |
161 ngx_cached_gmtime.ngx_tm_sec); | |
162 | |
163 ngx_cached_http_time.data = p; | |
164 | |
165 | |
166 #if (HAVE_GETTIMEZONE) | |
167 | |
168 ngx_gmtoff = ngx_gettimezone(); | |
169 ngx_gmtime(s + ngx_gmtoff * 60, &tm); | |
170 | |
171 #elif (HAVE_GMTOFF) | |
172 | |
173 ngx_localtime(&tm); | |
174 ngx_gmtoff = tm.ngx_tm_gmtoff / 60; | |
175 | |
176 #else | |
177 | |
178 ngx_localtime(&tm); | |
179 ngx_gmtoff = ngx_timezone(tm.ngx_tm_isdst); | |
180 | |
181 #endif | |
182 | |
183 | |
184 p = cached_err_log_time[slot]; | |
185 | |
186 ngx_snprintf((char *) p, sizeof("1970/09/28 12:00:00"), | |
187 "%4d/%02d/%02d %02d:%02d:%02d", | |
188 tm.ngx_tm_year, tm.ngx_tm_mon, | |
189 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
190 tm.ngx_tm_min, tm.ngx_tm_sec); | |
191 | |
192 ngx_cached_err_log_time.data = p; | |
193 | |
194 | |
195 p = cached_http_log_time[slot]; | |
196 | |
197 ngx_snprintf((char *) p, sizeof("28/Sep/1970:12:00:00 +0600"), | |
198 "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d", | |
199 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], | |
200 tm.ngx_tm_year, tm.ngx_tm_hour, | |
201 tm.ngx_tm_min, tm.ngx_tm_sec, | |
202 ngx_gmtoff < 0 ? '-' : '+', | |
203 abs(ngx_gmtoff / 60), abs(ngx_gmtoff % 60)); | |
204 | |
205 ngx_cached_http_log_time.data = p; | |
206 | |
207 | |
208 #if (NGX_THREADS) | |
209 ngx_mutex_unlock(ngx_time_mutex); | |
210 #endif | |
211 | |
212 } | |
213 | |
214 | |
215 size_t ngx_http_time(u_char *buf, time_t t) | |
216 { | |
217 ngx_tm_t tm; | |
218 | |
219 ngx_gmtime(t, &tm); | |
220 | |
221 return ngx_snprintf((char *) buf, sizeof("Mon, 28 Sep 1970 06:00:00 GMT"), | |
222 "%s, %02d %s %4d %02d:%02d:%02d GMT", | |
223 week[tm.ngx_tm_wday], | |
224 tm.ngx_tm_mday, | |
225 months[tm.ngx_tm_mon - 1], | |
226 tm.ngx_tm_year, | |
227 tm.ngx_tm_hour, | |
228 tm.ngx_tm_min, | |
229 tm.ngx_tm_sec); | |
230 } | |
231 | |
232 | |
233 size_t ngx_http_cookie_time(u_char *buf, time_t t) | |
234 { | |
235 ngx_tm_t tm; | |
236 | |
237 ngx_gmtime(t, &tm); | |
238 | |
239 /* | |
240 * Netscape 3.x does not understand 4-digit years at all and | |
241 * 2-digit years more than "37" | |
242 */ | |
243 | |
244 if (tm.ngx_tm_year > 2037) { | |
245 return ngx_snprintf((char *) buf, | |
246 sizeof("Mon, 28-Sep-1970 06:00:00 GMT"), | |
247 "%s, %02d-%s-%d %02d:%02d:%02d GMT", | |
248 week[tm.ngx_tm_wday], | |
249 tm.ngx_tm_mday, | |
250 months[tm.ngx_tm_mon - 1], | |
251 tm.ngx_tm_year, | |
252 tm.ngx_tm_hour, | |
253 tm.ngx_tm_min, | |
254 tm.ngx_tm_sec); | |
255 } else { | |
256 return ngx_snprintf((char *) buf, | |
257 sizeof("Mon, 28-Sep-70 06:00:00 GMT"), | |
258 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
259 week[tm.ngx_tm_wday], | |
260 tm.ngx_tm_mday, | |
261 months[tm.ngx_tm_mon - 1], | |
262 tm.ngx_tm_year % 100, | |
263 tm.ngx_tm_hour, | |
264 tm.ngx_tm_min, | |
265 tm.ngx_tm_sec); | |
266 } | |
267 } | |
268 | |
269 | |
270 void ngx_gmtime(time_t t, ngx_tm_t *tp) | |
271 { | |
272 ngx_int_t sec, min, hour, mday, mon, year, wday, yday, days; | |
273 | |
274 days = t / 86400; | |
275 | |
276 /* Jaunary 1, 1970 was Thursday */ | |
277 wday = (4 + days) % 7; | |
278 | |
279 t %= 86400; | |
280 hour = t / 3600; | |
281 t %= 3600; | |
282 min = t / 60; | |
283 sec = t % 60; | |
284 | |
285 /* the algorithm based on Gauss's formula */ | |
286 | |
287 days = days - (31 + 28) + 719527; | |
288 | |
289 year = days * 400 / (365 * 400 + 100 - 4 + 1); | |
290 yday = days - (365 * year + year / 4 - year / 100 + year / 400); | |
291 | |
292 mon = (yday + 31) * 12 / 367; | |
293 mday = yday - (mon * 367 / 12 - 31); | |
294 | |
295 mon += 2; | |
296 | |
297 if (yday >= 306) { | |
298 | |
299 /* | |
300 * there is no "yday" in Win32 SYSTEMTIME | |
301 * | |
302 * yday -= 306; | |
303 */ | |
304 | |
305 year++; | |
306 mon -= 12; | |
307 | |
308 if (mday == 0) { | |
309 /* Jaunary 31 */ | |
310 mon = 1; | |
311 mday = 31; | |
312 | |
313 } else if (mon == 2) { | |
314 | |
315 if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) { | |
316 if (mday > 29) { | |
317 mon = 3; | |
318 mday -= 29; | |
319 } | |
320 | |
321 } else if (mday > 28) { | |
322 mon = 3; | |
323 mday -= 28; | |
324 } | |
325 } | |
326 | |
327 /* | |
328 * there is no "yday" in Win32 SYSTEMTIME | |
329 * | |
330 * } else { | |
331 * yday += 31 + 28; | |
332 * | |
333 * if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) { | |
334 * yday++; | |
335 * } | |
336 */ | |
337 } | |
338 | |
339 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; | |
340 tp->ngx_tm_min = (ngx_tm_min_t) min; | |
341 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; | |
342 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; | |
343 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; | |
344 tp->ngx_tm_year = (ngx_tm_year_t) year; | |
345 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; | |
346 } |