Mercurial > hg > nginx-quic
annotate src/core/ngx_times.c @ 6038:94ce52db3367
Removed stub implementation of win32 mutexes.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Mon, 23 Mar 2015 13:52:47 +0300 |
parents | 777202558122 |
children | 40bea39731d7 |
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. |
441
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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 volatile ngx_str_t ngx_cached_syslog_time; |
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33 |
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34 #if !(NGX_WIN32) |
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35 |
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36 /* |
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37 * localtime() and localtime_r() are not Async-Signal-Safe functions, therefore, |
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38 * they must not be called by a signal handler, so we use the cached |
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39 * GMT offset value. Fortunately the value is changed only two times a year. |
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40 */ |
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41 |
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42 static ngx_int_t cached_gmtoff; |
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43 #endif |
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44 |
563 | 45 static ngx_time_t cached_time[NGX_TIME_SLOTS]; |
46 static u_char cached_err_log_time[NGX_TIME_SLOTS] | |
47 [sizeof("1970/09/28 12:00:00")]; | |
48 static u_char cached_http_time[NGX_TIME_SLOTS] | |
49 [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; | |
50 static u_char cached_http_log_time[NGX_TIME_SLOTS] | |
51 [sizeof("28/Sep/1970:12:00:00 +0600")]; | |
3873 | 52 static u_char cached_http_log_iso8601[NGX_TIME_SLOTS] |
53 [sizeof("1970-09-28T12:00:00+06:00")]; | |
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54 static u_char cached_syslog_time[NGX_TIME_SLOTS] |
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55 [sizeof("Sep 28 12:00:00")]; |
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58 static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; |
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59 static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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60 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; |
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61 |
501 | 62 void |
63 ngx_time_init(void) | |
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64 { |
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65 ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; |
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66 ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; |
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67 ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; |
3873 | 68 ngx_cached_http_log_iso8601.len = sizeof("1970-09-28T12:00:00+06:00") - 1; |
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69 ngx_cached_syslog_time.len = sizeof("Sep 28 12:00:00") - 1; |
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71 ngx_cached_time = &cached_time[0]; |
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72 |
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73 ngx_time_update(); |
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74 } |
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75 |
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76 |
563 | 77 void |
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78 ngx_time_update(void) |
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79 { |
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80 u_char *p0, *p1, *p2, *p3, *p4; |
563 | 81 ngx_tm_t tm, gmt; |
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82 time_t sec; |
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83 ngx_uint_t msec; |
563 | 84 ngx_time_t *tp; |
85 struct timeval tv; | |
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86 |
563 | 87 if (!ngx_trylock(&ngx_time_lock)) { |
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88 return; |
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89 } |
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90 |
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91 ngx_gettimeofday(&tv); |
563 | 92 |
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93 sec = tv.tv_sec; |
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94 msec = tv.tv_usec / 1000; |
563 | 95 |
96 ngx_current_msec = (ngx_msec_t) sec * 1000 + msec; | |
97 | |
98 tp = &cached_time[slot]; | |
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563 | 100 if (tp->sec == sec) { |
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101 tp->msec = msec; |
563 | 102 ngx_unlock(&ngx_time_lock); |
103 return; | |
104 } | |
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106 if (slot == NGX_TIME_SLOTS - 1) { |
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107 slot = 0; |
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108 } else { |
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109 slot++; |
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110 } |
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111 |
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112 tp = &cached_time[slot]; |
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113 |
563 | 114 tp->sec = sec; |
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115 tp->msec = msec; |
563 | 116 |
117 ngx_gmtime(sec, &gmt); | |
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120 p0 = &cached_http_time[slot][0]; |
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121 |
563 | 122 (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
123 week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, | |
124 months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, | |
125 gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); | |
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126 |
469 | 127 #if (NGX_HAVE_GETTIMEZONE) |
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128 |
563 | 129 tp->gmtoff = ngx_gettimezone(); |
130 ngx_gmtime(sec + tp->gmtoff * 60, &tm); | |
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131 |
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132 #elif (NGX_HAVE_GMTOFF) |
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134 ngx_localtime(sec, &tm); |
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135 cached_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); |
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136 tp->gmtoff = cached_gmtoff; |
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137 |
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138 #else |
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140 ngx_localtime(sec, &tm); |
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141 cached_gmtoff = ngx_timezone(tm.ngx_tm_isdst); |
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142 tp->gmtoff = cached_gmtoff; |
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143 |
323
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144 #endif |
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145 |
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146 |
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147 p1 = &cached_err_log_time[slot][0]; |
323
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148 |
563 | 149 (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", |
517 | 150 tm.ngx_tm_year, tm.ngx_tm_mon, |
151 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
152 tm.ngx_tm_min, tm.ngx_tm_sec); | |
182
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153 |
323
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154 |
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155 p2 = &cached_http_log_time[slot][0]; |
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156 |
563 | 157 (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d", |
517 | 158 tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], |
159 tm.ngx_tm_year, tm.ngx_tm_hour, | |
160 tm.ngx_tm_min, tm.ngx_tm_sec, | |
563 | 161 tp->gmtoff < 0 ? '-' : '+', |
162 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
323
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163 |
3873 | 164 p3 = &cached_http_log_iso8601[slot][0]; |
165 | |
166 (void) ngx_sprintf(p3, "%4d-%02d-%02dT%02d:%02d:%02d%c%02d:%02d", | |
167 tm.ngx_tm_year, tm.ngx_tm_mon, | |
168 tm.ngx_tm_mday, tm.ngx_tm_hour, | |
169 tm.ngx_tm_min, tm.ngx_tm_sec, | |
170 tp->gmtoff < 0 ? '-' : '+', | |
171 ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); | |
172 | |
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173 p4 = &cached_syslog_time[slot][0]; |
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174 |
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175 (void) ngx_sprintf(p4, "%s %2d %02d:%02d:%02d", |
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176 months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday, |
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177 tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); |
266
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178 |
563 | 179 ngx_memory_barrier(); |
266
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180 |
563 | 181 ngx_cached_time = tp; |
182 ngx_cached_http_time.data = p0; | |
183 ngx_cached_err_log_time.data = p1; | |
184 ngx_cached_http_log_time.data = p2; | |
3873 | 185 ngx_cached_http_log_iso8601.data = p3; |
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186 ngx_cached_syslog_time.data = p4; |
563 | 187 |
188 ngx_unlock(&ngx_time_lock); | |
178
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189 } |
182
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190 |
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191 |
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192 #if !(NGX_WIN32) |
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193 |
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194 void |
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195 ngx_time_sigsafe_update(void) |
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196 { |
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197 u_char *p, *p2; |
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198 ngx_tm_t tm; |
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199 time_t sec; |
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200 ngx_time_t *tp; |
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201 struct timeval tv; |
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202 |
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203 if (!ngx_trylock(&ngx_time_lock)) { |
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204 return; |
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205 } |
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206 |
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207 ngx_gettimeofday(&tv); |
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208 |
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209 sec = tv.tv_sec; |
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210 |
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211 tp = &cached_time[slot]; |
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212 |
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213 if (tp->sec == sec) { |
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214 ngx_unlock(&ngx_time_lock); |
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215 return; |
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216 } |
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217 |
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218 if (slot == NGX_TIME_SLOTS - 1) { |
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219 slot = 0; |
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220 } else { |
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221 slot++; |
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222 } |
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223 |
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224 tp = &cached_time[slot]; |
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225 |
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226 tp->sec = 0; |
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227 |
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228 ngx_gmtime(sec + cached_gmtoff * 60, &tm); |
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229 |
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230 p = &cached_err_log_time[slot][0]; |
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231 |
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232 (void) ngx_sprintf(p, "%4d/%02d/%02d %02d:%02d:%02d", |
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233 tm.ngx_tm_year, tm.ngx_tm_mon, |
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234 tm.ngx_tm_mday, tm.ngx_tm_hour, |
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235 tm.ngx_tm_min, tm.ngx_tm_sec); |
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236 |
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237 p2 = &cached_syslog_time[slot][0]; |
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238 |
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239 (void) ngx_sprintf(p2, "%s %2d %02d:%02d:%02d", |
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240 months[tm.ngx_tm_mon - 1], tm.ngx_tm_mday, |
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241 tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); |
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242 |
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243 ngx_memory_barrier(); |
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244 |
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245 ngx_cached_err_log_time.data = p; |
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246 ngx_cached_syslog_time.data = p2; |
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247 |
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248 ngx_unlock(&ngx_time_lock); |
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249 } |
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250 |
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251 #endif |
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252 |
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253 |
501 | 254 u_char * |
255 ngx_http_time(u_char *buf, time_t t) | |
182
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256 { |
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257 ngx_tm_t tm; |
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258 |
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259 ngx_gmtime(t, &tm); |
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260 |
455 | 261 return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", |
262 week[tm.ngx_tm_wday], | |
263 tm.ngx_tm_mday, | |
264 months[tm.ngx_tm_mon - 1], | |
265 tm.ngx_tm_year, | |
266 tm.ngx_tm_hour, | |
267 tm.ngx_tm_min, | |
268 tm.ngx_tm_sec); | |
409
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269 } |
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270 |
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271 |
501 | 272 u_char * |
273 ngx_http_cookie_time(u_char *buf, time_t t) | |
409
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274 { |
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275 ngx_tm_t tm; |
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276 |
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277 ngx_gmtime(t, &tm); |
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278 |
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279 /* |
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280 * Netscape 3.x does not understand 4-digit years at all and |
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281 * 2-digit years more than "37" |
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282 */ |
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283 |
455 | 284 return ngx_sprintf(buf, |
285 (tm.ngx_tm_year > 2037) ? | |
286 "%s, %02d-%s-%d %02d:%02d:%02d GMT": | |
287 "%s, %02d-%s-%02d %02d:%02d:%02d GMT", | |
288 week[tm.ngx_tm_wday], | |
289 tm.ngx_tm_mday, | |
290 months[tm.ngx_tm_mon - 1], | |
291 (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: | |
292 tm.ngx_tm_year % 100, | |
293 tm.ngx_tm_hour, | |
294 tm.ngx_tm_min, | |
295 tm.ngx_tm_sec); | |
182
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296 } |
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297 |
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298 |
501 | 299 void |
300 ngx_gmtime(time_t t, ngx_tm_t *tp) | |
182
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301 { |
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302 ngx_int_t yday; |
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303 ngx_uint_t n, sec, min, hour, mday, mon, year, wday, days, leap; |
182
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304 |
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305 /* the calculation is valid for positive time_t only */ |
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306 |
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307 n = (ngx_uint_t) t; |
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308 |
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309 days = n / 86400; |
182
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310 |
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311 /* January 1, 1970 was Thursday */ |
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312 |
182
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313 wday = (4 + days) % 7; |
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314 |
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315 n %= 86400; |
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316 hour = n / 3600; |
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317 n %= 3600; |
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318 min = n / 60; |
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319 sec = n % 60; |
182
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320 |
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321 /* |
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322 * the algorithm based on Gauss' formula, |
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323 * see src/http/ngx_http_parse_time.c |
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324 */ |
208
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325 |
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326 /* days since March 1, 1 BC */ |
182
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327 days = days - (31 + 28) + 719527; |
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328 |
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329 /* |
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330 * The "days" should be adjusted to 1 only, however, some March 1st's go |
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331 * to previous year, so we adjust them to 2. This causes also shift of the |
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332 * last February days to next year, but we catch the case when "yday" |
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333 * becomes negative. |
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334 */ |
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335 |
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336 year = (days + 2) * 400 / (365 * 400 + 100 - 4 + 1); |
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337 |
182
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338 yday = days - (365 * year + year / 4 - year / 100 + year / 400); |
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339 |
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340 if (yday < 0) { |
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341 leap = (year % 4 == 0) && (year % 100 || (year % 400 == 0)); |
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342 yday = 365 + leap + yday; |
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343 year--; |
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344 } |
182
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345 |
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346 /* |
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347 * The empirical formula that maps "yday" to month. |
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348 * There are at least 10 variants, some of them are: |
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349 * mon = (yday + 31) * 15 / 459 |
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350 * mon = (yday + 31) * 17 / 520 |
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351 * mon = (yday + 31) * 20 / 612 |
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352 */ |
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353 |
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354 mon = (yday + 31) * 10 / 306; |
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355 |
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356 /* the Gauss' formula that evaluates days before the month */ |
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357 |
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358 mday = yday - (367 * mon / 12 - 30) + 1; |
182
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359 |
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360 if (yday >= 306) { |
441
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361 |
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362 year++; |
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363 mon -= 10; |
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364 |
297
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365 /* |
324
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366 * there is no "yday" in Win32 SYSTEMTIME |
297
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367 * |
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368 * yday -= 306; |
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369 */ |
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370 |
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371 } else { |
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372 |
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373 mon += 2; |
182
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374 |
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375 /* |
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376 * there is no "yday" in Win32 SYSTEMTIME |
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377 * |
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378 * yday += 31 + 28 + leap; |
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379 */ |
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380 } |
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381 |
290
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382 tp->ngx_tm_sec = (ngx_tm_sec_t) sec; |
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383 tp->ngx_tm_min = (ngx_tm_min_t) min; |
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384 tp->ngx_tm_hour = (ngx_tm_hour_t) hour; |
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385 tp->ngx_tm_mday = (ngx_tm_mday_t) mday; |
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386 tp->ngx_tm_mon = (ngx_tm_mon_t) mon; |
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387 tp->ngx_tm_year = (ngx_tm_year_t) year; |
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388 tp->ngx_tm_wday = (ngx_tm_wday_t) wday; |
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389 } |
2162 | 390 |
391 | |
392 time_t | |
393 ngx_next_time(time_t when) | |
394 { | |
395 time_t now, next; | |
396 struct tm tm; | |
397 | |
398 now = ngx_time(); | |
399 | |
400 ngx_libc_localtime(now, &tm); | |
401 | |
402 tm.tm_hour = (int) (when / 3600); | |
403 when %= 3600; | |
404 tm.tm_min = (int) (when / 60); | |
405 tm.tm_sec = (int) (when % 60); | |
406 | |
407 next = mktime(&tm); | |
408 | |
409 if (next == -1) { | |
410 return -1; | |
411 } | |
412 | |
413 if (next - now > 0) { | |
414 return next; | |
415 } | |
416 | |
417 tm.tm_mday++; | |
418 | |
419 /* mktime() should normalize a date (Jan 32, etc) */ | |
420 | |
421 next = mktime(&tm); | |
422 | |
423 if (next != -1) { | |
424 return next; | |
425 } | |
426 | |
427 return -1; | |
428 } |