Mercurial > hg > nginx
annotate src/core/ngx_times.c @ 4104:84f34973684c
Version bump.
author | Igor Sysoev <igor@sysoev.ru> |
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date | Wed, 14 Sep 2011 15:20:01 +0000 |
parents | eae4a59ae59a |
children | d620f497c50f |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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11 /* |
563 | 12 * The time may be updated by signal handler or by several threads. |
13 * The time update operations are rare and require to hold the ngx_time_lock. | |
14 * The time read operations are frequent, so they are lock-free and get time | |
15 * values and strings from the current slot. Thus thread may get the corrupted | |
16 * values only if it is preempted while copying and then it is not scheduled | |
17 * to run more than NGX_TIME_SLOTS seconds. | |
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18 */ |
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19 |
563 | 20 #define NGX_TIME_SLOTS 64 |
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21 |
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22 static ngx_uint_t slot; |
563 | 23 static ngx_atomic_t ngx_time_lock; |
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24 |
563 | 25 volatile ngx_msec_t ngx_current_msec; |
26 volatile ngx_time_t *ngx_cached_time; | |
27 volatile ngx_str_t ngx_cached_err_log_time; | |
28 volatile ngx_str_t ngx_cached_http_time; | |
29 volatile ngx_str_t ngx_cached_http_log_time; | |
3873 | 30 volatile ngx_str_t ngx_cached_http_log_iso8601; |
182
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31 |
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32 #if !(NGX_WIN32) |
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33 |
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34 /* |
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35 * locatime() and localtime_r() are not Async-Signal-Safe functions, therefore, |
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36 * they must not be called by a signal handler, so we use the cached |
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37 * GMT offset value. Fortunately the value is changed only two times a year. |
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38 */ |
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39 |
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40 static ngx_int_t cached_gmtoff; |
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41 #endif |
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42 |
563 | 43 static ngx_time_t cached_time[NGX_TIME_SLOTS]; |
44 static u_char cached_err_log_time[NGX_TIME_SLOTS] | |
45 [sizeof("1970/09/28 12:00:00")]; | |
46 static u_char cached_http_time[NGX_TIME_SLOTS] | |
47 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; | |
48 static u_char cached_http_log_time[NGX_TIME_SLOTS] | |
49 [sizeof("28/Sep/1970:12:00:00 +0600")]; | |
3873 | 50 static u_char cached_http_log_iso8601[NGX_TIME_SLOTS] |
51 [sizeof("1970-09-28T12:00:00+06:00")]; | |
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52 |
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54 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; |
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55 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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56 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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57 |
501 | 58 void |
59 ngx_time_init(void) | |
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60 { |
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61 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; |
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62 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; |
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63 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; |
3873 | 64 ngx_cached_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1; |
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66 ngx_cached_time = &cached_time[0]; |
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67 |
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68 ngx_time_update(); |
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69 } |
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71 |
563 | 72 void |
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73 ngx_time_update(void) |
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74 { |
3873 | 75 u_char *p0, *p1, *p2, *p3; |
563 | 76 ngx_tm_t tm, gmt; |
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77 time_t sec; |
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78 ngx_uint_t msec; |
563 | 79 ngx_time_t *tp; |
80 struct timeval tv; | |
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81 |
563 | 82 if (!ngx_trylock(&ngx_time_lock)) { |
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83 return; |
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84 } |
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85 |
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86 ngx_gettimeofday(&tv); |
563 | 87 |
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88 sec = tv.tv_sec; |
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89 msec = tv.tv_usec / 1000; |
563 | 90 |
91 ngx_current_msec = (ngx_msec_t) sec * 1000 + msec; | |
92 | |
93 tp = &cached_time[slot]; | |
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94 |
563 | 95 if (tp->sec == sec) { |
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96 tp->msec = msec; |
563 | 97 ngx_unlock(&ngx_time_lock); |
98 return; | |
99 } | |
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101 if (slot == NGX_TIME_SLOTS - 1) { |
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102 slot = 0; |
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103 } else { |
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104 slot++; |
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105 } |
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106 |
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107 tp = &cached_time[slot]; |
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108 |
563 | 109 tp->sec = sec; |
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110 tp->msec = msec; |
563 | 111 |
112 ngx_gmtime(sec, &gmt); | |
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115 p0 = &cached_http_time[slot][0]; |
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116 |
563 | 117 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
118 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, | |
119 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, | |
120 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); | |
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121 |
469 | 122 #if (NGX_HAVE_GETTIMEZONE) |
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123 |
563 | 124 tp->gmtoff = ngx_gettimezone(); |
125 ngx_gmtime(sec + tp->gmtoff * 60, &tm); | |
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126 |
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127 #elif (NGX_HAVE_GMTOFF) |
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128 |
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129 ngx_localtime(sec, &tm); |
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130 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); |
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131 tp->gmtoff = cached_gmtoff; |
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132 |
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133 #else |
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134 |
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135 ngx_localtime(sec, &tm); |
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136 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst); |
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137 tp->gmtoff = cached_gmtoff; |
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139 #endif |
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142 p1 = &cached_err_log_time[slot][0]; |
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143 |
563 | 144 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", |
517 | 145 tm.ngx_tm_year, tm.ngx_tm_mon, |
146 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
147 tm.ngx_tm_min, tm.ngx_tm_sec); | |
182
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148 |
323
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149 |
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150 p2 = &cached_http_log_time[slot][0]; |
323
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151 |
563 | 152 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d", |
517 | 153 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], |
154 tm.ngx_tm_year, tm.ngx_tm_hour, | |
155 tm.ngx_tm_min, tm.ngx_tm_sec, | |
563 | 156 tp->gmtoff < 0 ? '-' : '+', |
157 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
323
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158 |
3873 | 159 p3 = &cached_http_log_iso8601[slot][0]; |
160 | |
161 (void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d", | |
162 tm.ngx_tm_year, tm.ngx_tm_mon, | |
163 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
164 tm.ngx_tm_min, tm.ngx_tm_sec, | |
165 tp->gmtoff < 0 ? '-' : '+', | |
166 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
167 | |
266
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168 |
563 | 169 ngx_memory_barrier(); |
266
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170 |
563 | 171 ngx_cached_time = tp; |
172 ngx_cached_http_time.data = p0; | |
173 ngx_cached_err_log_time.data = p1; | |
174 ngx_cached_http_log_time.data = p2; | |
3873 | 175 ngx_cached_http_log_iso8601.data = p3; |
563 | 176 |
177 ngx_unlock(&ngx_time_lock); | |
178
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178 } |
182
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179 |
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180 |
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181 #if !(NGX_WIN32) |
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182 |
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183 void |
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184 ngx_time_sigsafe_update(void) |
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185 { |
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186 u_char *p; |
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187 ngx_tm_t tm; |
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188 time_t sec; |
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189 ngx_time_t *tp; |
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190 struct timeval tv; |
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191 |
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192 if (!ngx_trylock(&ngx_time_lock)) { |
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193 return; |
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194 } |
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195 |
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196 ngx_gettimeofday(&tv); |
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197 |
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198 sec = tv.tv_sec; |
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199 |
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200 tp = &cached_time[slot]; |
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201 |
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202 if (tp->sec == sec) { |
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203 ngx_unlock(&ngx_time_lock); |
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204 return; |
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205 } |
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206 |
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207 if (slot == NGX_TIME_SLOTS - 1) { |
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208 slot = 0; |
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209 } else { |
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210 slot++; |
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211 } |
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212 |
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213 ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
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214 |
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215 p = &cached_err_log_time[slot][0]; |
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216 |
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217 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d", |
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218 tm.ngx_tm_year, tm.ngx_tm_mon, |
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219 tm.ngx_tm_mday, tm.ngx_tm_hour, |
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220 tm.ngx_tm_min, tm.ngx_tm_sec); |
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221 |
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222 ngx_memory_barrier(); |
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223 |
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224 ngx_cached_err_log_time.data = p; |
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225 |
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226 ngx_unlock(&ngx_time_lock); |
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227 } |
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228 |
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229 #endif |
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230 |
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231 |
501 | 232 u_char * |
233 ngx_http_time(u_char *buf, time_t t) | |
182
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234 { |
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235 ngx_tm_t tm; |
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236 |
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237 ngx_gmtime(t, &tm); |
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238 |
455 | 239 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
240 week[tm.ngx_tm_wday], | |
241 tm.ngx_tm_mday, | |
242 months[tm.ngx_tm_mon - 1], | |
243 tm.ngx_tm_year, | |
244 tm.ngx_tm_hour, | |
245 tm.ngx_tm_min, | |
246 tm.ngx_tm_sec); | |
409
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247 } |
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248 |
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249 |
501 | 250 u_char * |
251 ngx_http_cookie_time(u_char *buf, time_t t) | |
409
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252 { |
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253 ngx_tm_t tm; |
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254 |
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255 ngx_gmtime(t, &tm); |
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256 |
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257 /* |
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258 * Netscape 3.x does not understand 4-digit years at all and |
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259 * 2-digit years more than "37" |
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260 */ |
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261 |
455 | 262 return ngx_sprintf(buf, |
263 (tm.ngx_tm_year > 2037) ? | |
264 "%s, %02d-%s-%d %02d:%02d:%02d GMT": | |
265 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
266 week[tm.ngx_tm_wday], | |
267 tm.ngx_tm_mday, | |
268 months[tm.ngx_tm_mon - 1], | |
269 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: | |
270 tm.ngx_tm_year % 100, | |
271 tm.ngx_tm_hour, | |
272 tm.ngx_tm_min, | |
273 tm.ngx_tm_sec); | |
182
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274 } |
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275 |
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276 |
501 | 277 void |
278 ngx_gmtime(time_t t, ngx_tm_t *tp) | |
182
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279 { |
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280 ngx_int_t yday; |
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281 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap; |
182
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282 |
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283 /* the calculation is valid for positive time_t only */ |
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284 |
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285 n = (ngx_uint_t) t; |
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286 |
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287 days = n / 86400; |
182
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288 |
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289 /* Jaunary 1, 1970 was Thursday */ |
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290 |
182
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291 wday = (4 + days) % 7; |
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292 |
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293 n %= 86400; |
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294 hour = n / 3600; |
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295 n %= 3600; |
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296 min = n / 60; |
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297 sec = n % 60; |
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298 |
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299 /* |
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300 * the algorithm based on Gauss' formula, |
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301 * see src/http/ngx_http_parse_time.c |
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302 */ |
208
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303 |
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304 /* days since March 1, 1 BC */ |
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305 days = days - (31 + 28) + 719527; |
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306 |
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307 /* |
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308 * The "days" should be adjusted to 1 only, however, some March 1st's go |
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309 * to previous year, so we adjust them to 2. This causes also shift of the |
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310 * last Feburary days to next year, but we catch the case when "yday" |
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311 * becomes negative. |
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312 */ |
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313 |
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314 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
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315 |
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316 yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
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317 |
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318 if (yday < 0) { |
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319 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
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320 yday = 365 + leap + yday; |
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321 year--; |
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322 } |
182
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323 |
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324 /* |
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325 * The empirical formula that maps "yday" to month. |
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326 * There are at least 10 variants, some of them are: |
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327 * mon = (yday + 31) * 15 / 459 |
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328 * mon = (yday + 31) * 17 / 520 |
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329 * mon = (yday + 31) * 20 / 612 |
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330 */ |
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331 |
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332 mon = (yday + 31) * 10 / 306; |
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333 |
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334 /* the Gauss' formula that evaluates days before the month */ |
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335 |
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336 mday = yday - (367 * mon / 12 - 30) + 1; |
182
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337 |
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338 if (yday >= 306) { |
441
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339 |
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340 year++; |
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341 mon -= 10; |
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342 |
297
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343 /* |
324
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344 * there is no "yday" in Win32 SYSTEMTIME |
297
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345 * |
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346 * yday -= 306; |
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347 */ |
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348 |
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349 } else { |
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350 |
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351 mon += 2; |
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352 |
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353 /* |
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354 * there is no "yday" in Win32 SYSTEMTIME |
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355 * |
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356 * yday += 31 + 28 + leap; |
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357 */ |
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358 } |
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359 |
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360 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
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361 tp->ngx_tm_min = (ngx_tm_min_t) min; |
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362 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
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363 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
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364 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
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365 tp->ngx_tm_year = (ngx_tm_year_t) year; |
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366 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
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367 } |
2162 | 368 |
369 | |
370 time_t | |
371 ngx_next_time(time_t when) | |
372 { | |
373 time_t now, next; | |
374 struct tm tm; | |
375 | |
376 now = ngx_time(); | |
377 | |
378 ngx_libc_localtime(now, &tm); | |
379 | |
380 tm.tm_hour = (int) (when / 3600); | |
381 when %= 3600; | |
382 tm.tm_min = (int) (when / 60); | |
383 tm.tm_sec = (int) (when % 60); | |
384 | |
385 next = mktime(&tm); | |
386 | |
387 if (next == -1) { | |
388 return -1; | |
389 } | |
390 | |
391 if (next - now > 0) { | |
392 return next; | |
393 } | |
394 | |
395 tm.tm_mday++; | |
396 | |
397 /* mktime() should normalize a date (Jan 32, etc) */ | |
398 | |
399 next = mktime(&tm); | |
400 | |
401 if (next != -1) { | |
402 return next; | |
403 } | |
404 | |
405 return -1; | |
406 } |