Mercurial > hg > nginx-vendor-0-6
diff src/core/ngx_times.c @ 0:f0b350454894 NGINX_0_1_0
nginx 0.1.0
*) The first public version.
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 04 Oct 2004 00:00:00 +0400 |
parents | |
children | 4b2dafa26fe2 |
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new file mode 100644 --- /dev/null +++ b/src/core/ngx_times.c @@ -0,0 +1,346 @@ + +/* + * 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; + +static ngx_tm_t ngx_cached_gmtime; +static ngx_int_t ngx_gmtoff; + + +/* + * 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 && (TIME_T_SIZE > 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() +{ + 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 && (TIME_T_SIZE > 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 !(WIN32) + tzset(); +#endif + + ngx_time_update(tv.tv_sec); +} + + +#if (NGX_THREADS) + +ngx_int_t ngx_time_mutex_init(ngx_log_t *log) +{ + if (!(ngx_time_mutex = ngx_mutex_init(log, NGX_MUTEX_LIGHT))) { + 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 && (TIME_T_SIZE > 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]; + + ngx_snprintf((char *) p, sizeof("Mon, 28 Sep 1970 06:00:00 GMT"), + "%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 (HAVE_GETTIMEZONE) + + ngx_gmtoff = ngx_gettimezone(); + ngx_gmtime(s + ngx_gmtoff * 60, &tm); + +#elif (HAVE_GMTOFF) + + ngx_localtime(&tm); + ngx_gmtoff = tm.ngx_tm_gmtoff / 60; + +#else + + ngx_localtime(&tm); + ngx_gmtoff = ngx_timezone(tm.ngx_tm_isdst); + +#endif + + + p = cached_err_log_time[slot]; + + ngx_snprintf((char *) p, sizeof("1970/09/28 12:00:00"), + "%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]; + + ngx_snprintf((char *) p, sizeof("28/Sep/1970:12:00:00 +0600"), + "%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 + +} + + +size_t ngx_http_time(u_char *buf, time_t t) +{ + ngx_tm_t tm; + + ngx_gmtime(t, &tm); + + return ngx_snprintf((char *) buf, sizeof("Mon, 28 Sep 1970 06:00:00 GMT"), + "%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); +} + + +size_t 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" + */ + + if (tm.ngx_tm_year > 2037) { + return ngx_snprintf((char *) buf, + sizeof("Mon, 28-Sep-1970 06:00:00 GMT"), + "%s, %02d-%s-%d %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); + } else { + return ngx_snprintf((char *) buf, + sizeof("Mon, 28-Sep-70 06:00:00 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 % 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; +}