Mercurial > hg > nginx
annotate src/core/ngx_times.c @ 5129:96ee76fda991
Misc: switch to single export operation in "zip" target.
While exporting parts of the tree might be better in some cases, it
is awfully slow overseas, and also requires unlocking ssh key multiple
times. Exporting the whole repo and removing directories not needed for
zip is faster here.
It is also a required step before we can switch to Mercurial.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Fri, 22 Mar 2013 15:14:07 +0000 |
| parents | e23892a0c917 |
| children | 777202558122 |
| rev | line source |
|---|---|
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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12 /* |
| 563 | 13 * The time may be updated by signal handler or by several threads. |
| 14 * The time update operations are rare and require to hold the ngx_time_lock. | |
| 15 * The time read operations are frequent, so they are lock-free and get time | |
| 16 * values and strings from the current slot. Thus thread may get the corrupted | |
| 17 * values only if it is preempted while copying and then it is not scheduled | |
| 18 * to run more than NGX_TIME_SLOTS seconds. | |
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19 */ |
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20 |
| 563 | 21 #define NGX_TIME_SLOTS 64 |
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22 |
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23 static ngx_uint_t slot; |
| 563 | 24 static ngx_atomic_t ngx_time_lock; |
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25 |
| 563 | 26 volatile ngx_msec_t ngx_current_msec; |
| 27 volatile ngx_time_t *ngx_cached_time; | |
| 28 volatile ngx_str_t ngx_cached_err_log_time; | |
| 29 volatile ngx_str_t ngx_cached_http_time; | |
| 30 volatile ngx_str_t ngx_cached_http_log_time; | |
| 3873 | 31 volatile ngx_str_t ngx_cached_http_log_iso8601; |
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32 |
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33 #if !(NGX_WIN32) |
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34 |
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35 /* |
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36 * localtime() and localtime_r() are not Async-Signal-Safe functions, therefore, |
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37 * they must not be called by a signal handler, so we use the cached |
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38 * GMT offset value. Fortunately the value is changed only two times a year. |
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39 */ |
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40 |
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41 static ngx_int_t cached_gmtoff; |
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42 #endif |
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43 |
| 563 | 44 static ngx_time_t cached_time[NGX_TIME_SLOTS]; |
| 45 static u_char cached_err_log_time[NGX_TIME_SLOTS] | |
| 46 [sizeof("1970/09/28 12:00:00")]; | |
| 47 static u_char cached_http_time[NGX_TIME_SLOTS] | |
| 48 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; | |
| 49 static u_char cached_http_log_time[NGX_TIME_SLOTS] | |
| 50 [sizeof("28/Sep/1970:12:00:00 +0600")]; | |
| 3873 | 51 static u_char cached_http_log_iso8601[NGX_TIME_SLOTS] |
| 52 [sizeof("1970-09-28T12:00:00+06:00")]; | |
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54 |
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55 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; |
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56 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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57 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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58 |
| 501 | 59 void |
| 60 ngx_time_init(void) | |
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61 { |
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62 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; |
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63 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; |
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64 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; |
| 3873 | 65 ngx_cached_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1; |
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66 |
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67 ngx_cached_time = &cached_time[0]; |
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68 |
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69 ngx_time_update(); |
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70 } |
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71 |
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72 |
| 563 | 73 void |
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74 ngx_time_update(void) |
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75 { |
| 3873 | 76 u_char *p0, *p1, *p2, *p3; |
| 563 | 77 ngx_tm_t tm, gmt; |
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78 time_t sec; |
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79 ngx_uint_t msec; |
| 563 | 80 ngx_time_t *tp; |
| 81 struct timeval tv; | |
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82 |
| 563 | 83 if (!ngx_trylock(&ngx_time_lock)) { |
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84 return; |
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85 } |
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86 |
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87 ngx_gettimeofday(&tv); |
| 563 | 88 |
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89 sec = tv.tv_sec; |
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90 msec = tv.tv_usec / 1000; |
| 563 | 91 |
| 92 ngx_current_msec = (ngx_msec_t) sec * 1000 + msec; | |
| 93 | |
| 94 tp = &cached_time[slot]; | |
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95 |
| 563 | 96 if (tp->sec == sec) { |
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97 tp->msec = msec; |
| 563 | 98 ngx_unlock(&ngx_time_lock); |
| 99 return; | |
| 100 } | |
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101 |
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102 if (slot == NGX_TIME_SLOTS - 1) { |
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103 slot = 0; |
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104 } else { |
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105 slot++; |
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106 } |
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107 |
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108 tp = &cached_time[slot]; |
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109 |
| 563 | 110 tp->sec = sec; |
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111 tp->msec = msec; |
| 563 | 112 |
| 113 ngx_gmtime(sec, &gmt); | |
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114 |
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116 p0 = &cached_http_time[slot][0]; |
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117 |
| 563 | 118 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
| 119 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, | |
| 120 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, | |
| 121 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); | |
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122 |
| 469 | 123 #if (NGX_HAVE_GETTIMEZONE) |
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124 |
| 563 | 125 tp->gmtoff = ngx_gettimezone(); |
| 126 ngx_gmtime(sec + tp->gmtoff * 60, &tm); | |
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127 |
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128 #elif (NGX_HAVE_GMTOFF) |
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129 |
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130 ngx_localtime(sec, &tm); |
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131 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); |
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132 tp->gmtoff = cached_gmtoff; |
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133 |
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134 #else |
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135 |
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136 ngx_localtime(sec, &tm); |
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137 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst); |
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138 tp->gmtoff = cached_gmtoff; |
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139 |
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140 #endif |
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141 |
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142 |
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143 p1 = &cached_err_log_time[slot][0]; |
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144 |
| 563 | 145 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", |
| 517 | 146 tm.ngx_tm_year, tm.ngx_tm_mon, |
| 147 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
| 148 tm.ngx_tm_min, tm.ngx_tm_sec); | |
|
182
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149 |
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150 |
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151 p2 = &cached_http_log_time[slot][0]; |
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152 |
| 563 | 153 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d", |
| 517 | 154 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], |
| 155 tm.ngx_tm_year, tm.ngx_tm_hour, | |
| 156 tm.ngx_tm_min, tm.ngx_tm_sec, | |
| 563 | 157 tp->gmtoff < 0 ? '-' : '+', |
| 158 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
|
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159 |
| 3873 | 160 p3 = &cached_http_log_iso8601[slot][0]; |
| 161 | |
| 162 (void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d", | |
| 163 tm.ngx_tm_year, tm.ngx_tm_mon, | |
| 164 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
| 165 tm.ngx_tm_min, tm.ngx_tm_sec, | |
| 166 tp->gmtoff < 0 ? '-' : '+', | |
| 167 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
| 168 | |
|
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169 |
| 563 | 170 ngx_memory_barrier(); |
|
266
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171 |
| 563 | 172 ngx_cached_time = tp; |
| 173 ngx_cached_http_time.data = p0; | |
| 174 ngx_cached_err_log_time.data = p1; | |
| 175 ngx_cached_http_log_time.data = p2; | |
| 3873 | 176 ngx_cached_http_log_iso8601.data = p3; |
| 563 | 177 |
| 178 ngx_unlock(&ngx_time_lock); | |
|
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179 } |
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182
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180 |
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181 |
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182 #if !(NGX_WIN32) |
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183 |
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184 void |
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185 ngx_time_sigsafe_update(void) |
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186 { |
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187 u_char *p; |
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188 ngx_tm_t tm; |
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189 time_t sec; |
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190 ngx_time_t *tp; |
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191 struct timeval tv; |
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192 |
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193 if (!ngx_trylock(&ngx_time_lock)) { |
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194 return; |
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195 } |
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196 |
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197 ngx_gettimeofday(&tv); |
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198 |
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199 sec = tv.tv_sec; |
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200 |
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201 tp = &cached_time[slot]; |
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202 |
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203 if (tp->sec == sec) { |
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204 ngx_unlock(&ngx_time_lock); |
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205 return; |
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206 } |
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207 |
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208 if (slot == NGX_TIME_SLOTS - 1) { |
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209 slot = 0; |
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210 } else { |
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211 slot++; |
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212 } |
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213 |
|
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214 tp = &cached_time[slot]; |
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215 |
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216 tp->sec = 0; |
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217 |
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218 ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
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219 |
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220 p = &cached_err_log_time[slot][0]; |
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221 |
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222 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d", |
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223 tm.ngx_tm_year, tm.ngx_tm_mon, |
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224 tm.ngx_tm_mday, tm.ngx_tm_hour, |
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225 tm.ngx_tm_min, tm.ngx_tm_sec); |
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226 |
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227 ngx_memory_barrier(); |
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228 |
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229 ngx_cached_err_log_time.data = p; |
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230 |
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231 ngx_unlock(&ngx_time_lock); |
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232 } |
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233 |
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234 #endif |
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235 |
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236 |
| 501 | 237 u_char * |
| 238 ngx_http_time(u_char *buf, time_t t) | |
|
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239 { |
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240 ngx_tm_t tm; |
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241 |
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242 ngx_gmtime(t, &tm); |
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243 |
| 455 | 244 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
| 245 week[tm.ngx_tm_wday], | |
| 246 tm.ngx_tm_mday, | |
| 247 months[tm.ngx_tm_mon - 1], | |
| 248 tm.ngx_tm_year, | |
| 249 tm.ngx_tm_hour, | |
| 250 tm.ngx_tm_min, | |
| 251 tm.ngx_tm_sec); | |
|
409
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252 } |
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253 |
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254 |
| 501 | 255 u_char * |
| 256 ngx_http_cookie_time(u_char *buf, time_t t) | |
|
409
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257 { |
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258 ngx_tm_t tm; |
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259 |
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260 ngx_gmtime(t, &tm); |
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261 |
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262 /* |
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263 * Netscape 3.x does not understand 4-digit years at all and |
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264 * 2-digit years more than "37" |
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265 */ |
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266 |
| 455 | 267 return ngx_sprintf(buf, |
| 268 (tm.ngx_tm_year > 2037) ? | |
| 269 "%s, %02d-%s-%d %02d:%02d:%02d GMT": | |
| 270 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
| 271 week[tm.ngx_tm_wday], | |
| 272 tm.ngx_tm_mday, | |
| 273 months[tm.ngx_tm_mon - 1], | |
| 274 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: | |
| 275 tm.ngx_tm_year % 100, | |
| 276 tm.ngx_tm_hour, | |
| 277 tm.ngx_tm_min, | |
| 278 tm.ngx_tm_sec); | |
|
182
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279 } |
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280 |
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281 |
| 501 | 282 void |
| 283 ngx_gmtime(time_t t, ngx_tm_t *tp) | |
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284 { |
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285 ngx_int_t yday; |
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286 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap; |
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287 |
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288 /* the calculation is valid for positive time_t only */ |
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289 |
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290 n = (ngx_uint_t) t; |
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291 |
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292 days = n / 86400; |
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293 |
|
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294 /* January 1, 1970 was Thursday */ |
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295 |
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296 wday = (4 + days) % 7; |
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297 |
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298 n %= 86400; |
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299 hour = n / 3600; |
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300 n %= 3600; |
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301 min = n / 60; |
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302 sec = n % 60; |
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303 |
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304 /* |
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305 * the algorithm based on Gauss' formula, |
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306 * see src/http/ngx_http_parse_time.c |
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307 */ |
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208
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308 |
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309 /* days since March 1, 1 BC */ |
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310 days = days - (31 + 28) + 719527; |
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311 |
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312 /* |
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313 * The "days" should be adjusted to 1 only, however, some March 1st's go |
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314 * to previous year, so we adjust them to 2. This causes also shift of the |
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315 * last February days to next year, but we catch the case when "yday" |
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316 * becomes negative. |
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317 */ |
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318 |
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319 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
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320 |
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321 yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
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322 |
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323 if (yday < 0) { |
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324 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
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325 yday = 365 + leap + yday; |
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326 year--; |
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327 } |
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328 |
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329 /* |
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330 * The empirical formula that maps "yday" to month. |
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331 * There are at least 10 variants, some of them are: |
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332 * mon = (yday + 31) * 15 / 459 |
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333 * mon = (yday + 31) * 17 / 520 |
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334 * mon = (yday + 31) * 20 / 612 |
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335 */ |
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336 |
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337 mon = (yday + 31) * 10 / 306; |
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338 |
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339 /* the Gauss' formula that evaluates days before the month */ |
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340 |
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341 mday = yday - (367 * mon / 12 - 30) + 1; |
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342 |
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343 if (yday >= 306) { |
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344 |
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345 year++; |
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346 mon -= 10; |
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347 |
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297
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348 /* |
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324
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349 * there is no "yday" in Win32 SYSTEMTIME |
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350 * |
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351 * yday -= 306; |
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352 */ |
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353 |
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354 } else { |
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355 |
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356 mon += 2; |
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357 |
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358 /* |
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359 * there is no "yday" in Win32 SYSTEMTIME |
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360 * |
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361 * yday += 31 + 28 + leap; |
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362 */ |
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363 } |
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364 |
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290
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365 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
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366 tp->ngx_tm_min = (ngx_tm_min_t) min; |
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367 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
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368 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
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369 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
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370 tp->ngx_tm_year = (ngx_tm_year_t) year; |
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371 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
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372 } |
| 2162 | 373 |
| 374 | |
| 375 time_t | |
| 376 ngx_next_time(time_t when) | |
| 377 { | |
| 378 time_t now, next; | |
| 379 struct tm tm; | |
| 380 | |
| 381 now = ngx_time(); | |
| 382 | |
| 383 ngx_libc_localtime(now, &tm); | |
| 384 | |
| 385 tm.tm_hour = (int) (when / 3600); | |
| 386 when %= 3600; | |
| 387 tm.tm_min = (int) (when / 60); | |
| 388 tm.tm_sec = (int) (when % 60); | |
| 389 | |
| 390 next = mktime(&tm); | |
| 391 | |
| 392 if (next == -1) { | |
| 393 return -1; | |
| 394 } | |
| 395 | |
| 396 if (next - now > 0) { | |
| 397 return next; | |
| 398 } | |
| 399 | |
| 400 tm.tm_mday++; | |
| 401 | |
| 402 /* mktime() should normalize a date (Jan 32, etc) */ | |
| 403 | |
| 404 next = mktime(&tm); | |
| 405 | |
| 406 if (next != -1) { | |
| 407 return next; | |
| 408 } | |
| 409 | |
| 410 return -1; | |
| 411 } |