Mercurial > hg > nginx-vendor-0-7
view src/core/ngx_times.c @ 273:60df8db42ffb
Added tag NGINX_0_5_6 for changeset 29a6403156b0
author | Igor Sysoev <http://sysoev.ru> |
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date | Tue, 09 Jan 2007 00:00:00 +0300 |
parents | 6eb1e38f0f1f |
children | fa73fb2d9427 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> /* * The time may be updated by signal handler or by several threads. * The time update operations are rare and require to hold the ngx_time_lock. * The time read operations are frequent, so they are lock-free and get time * values and strings from the current slot. Thus thread may get the corrupted * values only if it is preempted while copying and then it is not scheduled * to run more than NGX_TIME_SLOTS seconds. */ #define NGX_TIME_SLOTS 64 static ngx_uint_t slot; static ngx_atomic_t ngx_time_lock; volatile ngx_msec_t ngx_current_msec; volatile ngx_time_t *ngx_cached_time; volatile ngx_str_t ngx_cached_err_log_time; volatile ngx_str_t ngx_cached_http_time; volatile ngx_str_t ngx_cached_http_log_time; static ngx_time_t cached_time[NGX_TIME_SLOTS]; static u_char cached_err_log_time[NGX_TIME_SLOTS] [sizeof("1970/09/28 12:00:00")]; static u_char cached_http_time[NGX_TIME_SLOTS] [sizeof("Mon, 28 Sep 1970 06:00:00 GMT")]; static u_char cached_http_log_time[NGX_TIME_SLOTS] [sizeof("28/Sep/1970:12:00:00 +0600")]; static char *week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; static char *months[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; void ngx_time_init(void) { ngx_cached_err_log_time.len = sizeof("1970/09/28 12:00:00") - 1; ngx_cached_http_time.len = sizeof("Mon, 28 Sep 1970 06:00:00 GMT") - 1; ngx_cached_http_log_time.len = sizeof("28/Sep/1970:12:00:00 +0600") - 1; ngx_cached_time = &cached_time[0]; #if !(NGX_WIN32) tzset(); #endif ngx_time_update(0, 0); } void ngx_time_update(time_t sec, ngx_uint_t msec) { u_char *p0, *p1, *p2; ngx_tm_t tm, gmt; ngx_time_t *tp; struct timeval tv; if (!ngx_trylock(&ngx_time_lock)) { return; } if (sec == 0) { ngx_gettimeofday(&tv); sec = tv.tv_sec; msec = tv.tv_usec / 1000; } ngx_current_msec = (ngx_msec_t) sec * 1000 + msec; tp = &cached_time[slot]; if (tp->sec == sec) { tp->msec = msec; ngx_unlock(&ngx_time_lock); return; } if (slot == NGX_TIME_SLOTS) { slot = 0; } else { slot++; } tp = &cached_time[slot]; tp->sec = sec; tp->msec = msec; ngx_gmtime(sec, &gmt); p0 = cached_http_time[slot]; (void) ngx_sprintf(p0, "%s, %02d %s %4d %02d:%02d:%02d GMT", week[gmt.ngx_tm_wday], gmt.ngx_tm_mday, months[gmt.ngx_tm_mon - 1], gmt.ngx_tm_year, gmt.ngx_tm_hour, gmt.ngx_tm_min, gmt.ngx_tm_sec); #if (NGX_HAVE_GETTIMEZONE) tp->gmtoff = ngx_gettimezone(); ngx_gmtime(sec + tp->gmtoff * 60, &tm); #elif (NGX_HAVE_GMTOFF) ngx_localtime(sec, &tm); tp->gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); #else ngx_localtime(sec, &tm); tp->gmtoff = ngx_timezone(tm.ngx_tm_isdst); #endif p1 = cached_err_log_time[slot]; (void) ngx_sprintf(p1, "%4d/%02d/%02d %02d:%02d:%02d", tm.ngx_tm_year, tm.ngx_tm_mon, tm.ngx_tm_mday, tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); p2 = cached_http_log_time[slot]; (void) ngx_sprintf(p2, "%02d/%s/%d:%02d:%02d:%02d %c%02d%02d", tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], tm.ngx_tm_year, tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec, tp->gmtoff < 0 ? '-' : '+', ngx_abs(tp->gmtoff / 60), ngx_abs(tp->gmtoff % 60)); ngx_memory_barrier(); ngx_cached_time = tp; ngx_cached_http_time.data = p0; ngx_cached_err_log_time.data = p1; ngx_cached_http_log_time.data = p2; ngx_unlock(&ngx_time_lock); } u_char * ngx_http_time(u_char *buf, time_t t) { ngx_tm_t tm; ngx_gmtime(t, &tm); return ngx_sprintf(buf, "%s, %02d %s %4d %02d:%02d:%02d GMT", week[tm.ngx_tm_wday], tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], tm.ngx_tm_year, tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); } u_char * ngx_http_cookie_time(u_char *buf, time_t t) { ngx_tm_t tm; ngx_gmtime(t, &tm); /* * Netscape 3.x does not understand 4-digit years at all and * 2-digit years more than "37" */ return ngx_sprintf(buf, (tm.ngx_tm_year > 2037) ? "%s, %02d-%s-%d %02d:%02d:%02d GMT": "%s, %02d-%s-%02d %02d:%02d:%02d GMT", week[tm.ngx_tm_wday], tm.ngx_tm_mday, months[tm.ngx_tm_mon - 1], (tm.ngx_tm_year > 2037) ? tm.ngx_tm_year: tm.ngx_tm_year % 100, tm.ngx_tm_hour, tm.ngx_tm_min, tm.ngx_tm_sec); } void ngx_gmtime(time_t t, ngx_tm_t *tp) { ngx_int_t sec, min, hour, mday, mon, year, wday, yday, days; days = t / 86400; /* Jaunary 1, 1970 was Thursday */ wday = (4 + days) % 7; t %= 86400; hour = t / 3600; t %= 3600; min = t / 60; sec = t % 60; /* the algorithm based on Gauss's formula */ days = days - (31 + 28) + 719527; year = days * 400 / (365 * 400 + 100 - 4 + 1); yday = days - (365 * year + year / 4 - year / 100 + year / 400); mon = (yday + 31) * 12 / 367; mday = yday - (mon * 367 / 12 - 31); mon += 2; if (yday >= 306) { /* * there is no "yday" in Win32 SYSTEMTIME * * yday -= 306; */ year++; mon -= 12; if (mday == 0) { /* Jaunary 31 */ mon = 1; mday = 31; } else if (mon == 2) { if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) { if (mday > 29) { mon = 3; mday -= 29; } } else if (mday > 28) { mon = 3; mday -= 28; } } /* * there is no "yday" in Win32 SYSTEMTIME * * } else { * yday += 31 + 28; * * if ((year % 4 == 0) && (year % 100 || (year % 400 == 0))) { * yday++; * } */ } tp->ngx_tm_sec = (ngx_tm_sec_t) sec; tp->ngx_tm_min = (ngx_tm_min_t) min; tp->ngx_tm_hour = (ngx_tm_hour_t) hour; tp->ngx_tm_mday = (ngx_tm_mday_t) mday; tp->ngx_tm_mon = (ngx_tm_mon_t) mon; tp->ngx_tm_year = (ngx_tm_year_t) year; tp->ngx_tm_wday = (ngx_tm_wday_t) wday; }