Mercurial > hg > nginx-vendor-1-0
view src/core/ngx_times.c @ 99:942ae8bb3ece
Added tag NGINX_0_2_3 for changeset 8bf57caa374a
author | Igor Sysoev <http://sysoev.ru> |
---|---|
date | Fri, 30 Sep 2005 00:00:00 +0400 |
parents | 77969b24f355 |
children | 45f7329b4bd0 |
line wrap: on
line source
/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> ngx_epoch_msec_t ngx_elapsed_msec; ngx_epoch_msec_t ngx_old_elapsed_msec; ngx_epoch_msec_t ngx_start_msec; ngx_int_t ngx_gmtoff; static ngx_tm_t ngx_cached_gmtime; /* * In the threaded mode only one thread updates the cached time and strings * and these operations are protected by the mutex. The reading of the cached * time and strings is not protected by the mutex. To avoid the race * conditions for non-atomic values we use the NGX_TIME_SLOTS slots to store * time value and strings. 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. */ #if (NGX_THREADS) #define NGX_TIME_SLOTS 60 static ngx_uint_t slot = NGX_TIME_SLOTS; static ngx_mutex_t *ngx_time_mutex; #else #define NGX_TIME_SLOTS 1 #define slot 0 #endif #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE)) volatile time_t *ngx_cached_time; static time_t cached_time[NGX_TIME_SLOTS]; #else volatile time_t ngx_cached_time; #endif ngx_thread_volatile ngx_str_t ngx_cached_err_log_time; ngx_thread_volatile ngx_str_t ngx_cached_http_time; ngx_thread_volatile ngx_str_t ngx_cached_http_log_time; 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) { struct timeval tv; ngx_memzero(&ngx_cached_gmtime, sizeof(ngx_tm_t)); #ifdef ngx_tm_zone ngx_cached_gmtime.ngx_tm_zone = "GMT"; #endif 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; #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE)) ngx_cached_time = &cached_time[0]; #endif ngx_gettimeofday(&tv); ngx_start_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000; ngx_old_elapsed_msec = 0; ngx_elapsed_msec = 0; #if !(NGX_WIN32) tzset(); #endif ngx_time_update(tv.tv_sec); } #if (NGX_THREADS) ngx_int_t ngx_time_mutex_init(ngx_log_t *log) { ngx_time_mutex = ngx_mutex_init(log, NGX_MUTEX_LIGHT); if (ngx_time_mutex == NULL) { return NGX_ERROR; } return NGX_OK; } #endif void ngx_time_update(time_t s) { u_char *p; ngx_tm_t tm; if (ngx_time() == s) { return; } #if (NGX_THREADS) if (ngx_mutex_trylock(ngx_time_mutex) != NGX_OK) { return; } if (slot == NGX_TIME_SLOTS) { slot = 0; } else { slot++; } #if (NGX_THREADS && (NGX_TIME_T_SIZE > NGX_SIG_ATOMIC_T_SIZE)) ngx_cached_time = &cached_time[slot]; #endif #endif ngx_time() = s; ngx_gmtime(s, &ngx_cached_gmtime); p = cached_http_time[slot]; (void) ngx_sprintf(p, "%s, %02d %s %4d %02d:%02d:%02d GMT", week[ngx_cached_gmtime.ngx_tm_wday], ngx_cached_gmtime.ngx_tm_mday, months[ngx_cached_gmtime.ngx_tm_mon - 1], ngx_cached_gmtime.ngx_tm_year, ngx_cached_gmtime.ngx_tm_hour, ngx_cached_gmtime.ngx_tm_min, ngx_cached_gmtime.ngx_tm_sec); ngx_cached_http_time.data = p; #if (NGX_HAVE_GETTIMEZONE) ngx_gmtoff = ngx_gettimezone(); ngx_gmtime(s + ngx_gmtoff * 60, &tm); #elif (NGX_HAVE_GMTOFF) ngx_localtime(&tm); ngx_gmtoff = (ngx_int_t) (tm.ngx_tm_gmtoff / 60); #else ngx_localtime(&tm); ngx_gmtoff = ngx_timezone(tm.ngx_tm_isdst); #endif p = cached_err_log_time[slot]; (void) ngx_sprintf(p, "%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); ngx_cached_err_log_time.data = p; p = cached_http_log_time[slot]; (void) ngx_sprintf(p, "%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, ngx_gmtoff < 0 ? '-' : '+', abs(ngx_gmtoff / 60), abs(ngx_gmtoff % 60)); ngx_cached_http_log_time.data = p; #if (NGX_THREADS) ngx_mutex_unlock(ngx_time_mutex); #endif } 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; }