Mercurial > hg > nginx-quic
annotate src/core/ngx_times.c @ 4569:1db899642518
Upstream: reject upstreams without normal servers.
Such upstreams cause CPU hog later in the code as number of peers isn't
expected to be 0. Currently this may happen either if there are only backup
servers defined in an upstream block, or if server with ipv6 address used
in an upstream block.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 02 Apr 2012 21:29:35 +0000 |
parents | 778ef9c3fd2d |
children | 67653855682e |
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 |
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 * locatime() 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")]; | |
178
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53 |
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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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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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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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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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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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143 p1 = &cached_err_log_time[slot][0]; |
323
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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 |
323
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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)); | |
323
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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 | |
266
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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); | |
178
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179 } |
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 ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
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215 |
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216 p = &cached_err_log_time[slot][0]; |
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217 |
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218 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d", |
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219 tm.ngx_tm_year, tm.ngx_tm_mon, |
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220 tm.ngx_tm_mday, tm.ngx_tm_hour, |
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221 tm.ngx_tm_min, tm.ngx_tm_sec); |
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222 |
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223 ngx_memory_barrier(); |
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224 |
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225 ngx_cached_err_log_time.data = p; |
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226 |
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227 ngx_unlock(&ngx_time_lock); |
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228 } |
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229 |
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230 #endif |
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231 |
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232 |
501 | 233 u_char * |
234 ngx_http_time(u_char *buf, time_t t) | |
182
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235 { |
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236 ngx_tm_t tm; |
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237 |
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238 ngx_gmtime(t, &tm); |
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239 |
455 | 240 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
241 week[tm.ngx_tm_wday], | |
242 tm.ngx_tm_mday, | |
243 months[tm.ngx_tm_mon - 1], | |
244 tm.ngx_tm_year, | |
245 tm.ngx_tm_hour, | |
246 tm.ngx_tm_min, | |
247 tm.ngx_tm_sec); | |
409
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248 } |
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249 |
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250 |
501 | 251 u_char * |
252 ngx_http_cookie_time(u_char *buf, time_t t) | |
409
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253 { |
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254 ngx_tm_t tm; |
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255 |
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256 ngx_gmtime(t, &tm); |
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257 |
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258 /* |
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259 * Netscape 3.x does not understand 4-digit years at all and |
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260 * 2-digit years more than "37" |
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261 */ |
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262 |
455 | 263 return ngx_sprintf(buf, |
264 (tm.ngx_tm_year > 2037) ? | |
265 "%s, %02d-%s-%d %02d:%02d:%02d GMT": | |
266 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
267 week[tm.ngx_tm_wday], | |
268 tm.ngx_tm_mday, | |
269 months[tm.ngx_tm_mon - 1], | |
270 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: | |
271 tm.ngx_tm_year % 100, | |
272 tm.ngx_tm_hour, | |
273 tm.ngx_tm_min, | |
274 tm.ngx_tm_sec); | |
182
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275 } |
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276 |
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277 |
501 | 278 void |
279 ngx_gmtime(time_t t, ngx_tm_t *tp) | |
182
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280 { |
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281 ngx_int_t yday; |
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282 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap; |
182
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283 |
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284 /* the calculation is valid for positive time_t only */ |
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285 |
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286 n = (ngx_uint_t) t; |
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287 |
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288 days = n / 86400; |
182
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289 |
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290 /* January 1, 1970 was Thursday */ |
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291 |
182
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292 wday = (4 + days) % 7; |
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293 |
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294 n %= 86400; |
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295 hour = n / 3600; |
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296 n %= 3600; |
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297 min = n / 60; |
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298 sec = n % 60; |
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299 |
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300 /* |
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301 * the algorithm based on Gauss' formula, |
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302 * see src/http/ngx_http_parse_time.c |
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303 */ |
208
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304 |
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305 /* days since March 1, 1 BC */ |
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306 days = days - (31 + 28) + 719527; |
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307 |
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308 /* |
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309 * The "days" should be adjusted to 1 only, however, some March 1st's go |
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310 * to previous year, so we adjust them to 2. This causes also shift of the |
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311 * last Feburary days to next year, but we catch the case when "yday" |
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312 * becomes negative. |
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313 */ |
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314 |
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315 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
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316 |
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317 yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
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318 |
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319 if (yday < 0) { |
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320 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
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321 yday = 365 + leap + yday; |
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322 year--; |
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323 } |
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324 |
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325 /* |
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326 * The empirical formula that maps "yday" to month. |
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327 * There are at least 10 variants, some of them are: |
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328 * mon = (yday + 31) * 15 / 459 |
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329 * mon = (yday + 31) * 17 / 520 |
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330 * mon = (yday + 31) * 20 / 612 |
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331 */ |
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332 |
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333 mon = (yday + 31) * 10 / 306; |
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334 |
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335 /* the Gauss' formula that evaluates days before the month */ |
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336 |
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337 mday = yday - (367 * mon / 12 - 30) + 1; |
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338 |
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339 if (yday >= 306) { |
441
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340 |
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341 year++; |
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342 mon -= 10; |
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343 |
297
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344 /* |
324
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345 * there is no "yday" in Win32 SYSTEMTIME |
297
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346 * |
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347 * yday -= 306; |
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348 */ |
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349 |
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350 } else { |
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351 |
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352 mon += 2; |
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353 |
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354 /* |
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355 * there is no "yday" in Win32 SYSTEMTIME |
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356 * |
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357 * yday += 31 + 28 + leap; |
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358 */ |
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359 } |
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360 |
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361 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
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362 tp->ngx_tm_min = (ngx_tm_min_t) min; |
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363 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
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364 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
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365 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
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366 tp->ngx_tm_year = (ngx_tm_year_t) year; |
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367 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
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368 } |
2162 | 369 |
370 | |
371 time_t | |
372 ngx_next_time(time_t when) | |
373 { | |
374 time_t now, next; | |
375 struct tm tm; | |
376 | |
377 now = ngx_time(); | |
378 | |
379 ngx_libc_localtime(now, &tm); | |
380 | |
381 tm.tm_hour = (int) (when / 3600); | |
382 when %= 3600; | |
383 tm.tm_min = (int) (when / 60); | |
384 tm.tm_sec = (int) (when % 60); | |
385 | |
386 next = mktime(&tm); | |
387 | |
388 if (next == -1) { | |
389 return -1; | |
390 } | |
391 | |
392 if (next - now > 0) { | |
393 return next; | |
394 } | |
395 | |
396 tm.tm_mday++; | |
397 | |
398 /* mktime() should normalize a date (Jan 32, etc) */ | |
399 | |
400 next = mktime(&tm); | |
401 | |
402 if (next != -1) { | |
403 return next; | |
404 } | |
405 | |
406 return -1; | |
407 } |