Mercurial > hg > nginx
annotate src/core/ngx_times.c @ 4309:3f6040cd731e
Added shmtx interface to forcibly unlock mutexes.
It is currently used from master process on abnormal worker termination to
unlock accept mutex (unlocking of accept mutex was broken in 1.0.2). It is
expected to be used in the future to unlock other mutexes as well.
Shared mutex code was rewritten to make this possible in a safe way, i.e.
with a check if lock was actually held by the exited process. We again use
pid to lock mutex, and use separate atomic variable for a count of processes
waiting in sem_wait().
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Wed, 23 Nov 2011 13:55:38 +0000 |
| parents | eae4a59ae59a |
| children | d620f497c50f |
| rev | line source |
|---|---|
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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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9 |
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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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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; |
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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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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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70 |
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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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100 |
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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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113 |
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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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178
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138 |
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139 #endif |
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140 |
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141 |
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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 |
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149 |
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150 p2 = &cached_http_log_time[slot][0]; |
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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)); | |
|
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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 } |
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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) | |
|
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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); | |
|
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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) | |
|
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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; |
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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; |
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288 |
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289 /* Jaunary 1, 1970 was Thursday */ |
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290 |
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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 */ |
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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 } |
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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; |
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337 |
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338 if (yday >= 306) { |
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441
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339 |
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340 year++; |
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341 mon -= 10; |
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342 |
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297
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343 /* |
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324
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344 * there is no "yday" in Win32 SYSTEMTIME |
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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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290
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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 } |