Mercurial > hg > nginx-vendor-0-7
diff src/event/ngx_event_timer.h @ 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 | 46833bd150cb |
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new file mode 100644 --- /dev/null +++ b/src/event/ngx_event_timer.h @@ -0,0 +1,120 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#ifndef _NGX_EVENT_TIMER_H_INCLUDED_ +#define _NGX_EVENT_TIMER_H_INCLUDED_ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_event.h> + + +#define NGX_TIMER_INFINITE -1 +#define NGX_TIMER_ERROR -2 + +/* + * 32 bit timer key value resolution + * + * 1 msec - 24 days + * 10 msec - 8 months + * 50 msec - 3 years 5 months + * 100 msec - 6 years 10 months + */ + +#define NGX_TIMER_RESOLUTION 1 + + +ngx_int_t ngx_event_timer_init(ngx_log_t *log); +ngx_msec_t ngx_event_find_timer(void); +void ngx_event_expire_timers(ngx_msec_t timer); + + +#if (NGX_THREADS) +extern ngx_mutex_t *ngx_event_timer_mutex; +#endif + + +extern ngx_thread_volatile ngx_rbtree_t *ngx_event_timer_rbtree; +extern ngx_rbtree_t ngx_event_timer_sentinel; + + +ngx_inline static void ngx_event_del_timer(ngx_event_t *ev) +{ + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "event timer del: %d: %d", + ngx_event_ident(ev->data), ev->rbtree_key); + + if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) { + return; + } + + ngx_rbtree_delete((ngx_rbtree_t **) &ngx_event_timer_rbtree, + &ngx_event_timer_sentinel, + (ngx_rbtree_t *) &ev->rbtree_key); + + ngx_mutex_unlock(ngx_event_timer_mutex); + +#if (NGX_DEBUG) + ev->rbtree_left = NULL; + ev->rbtree_right = NULL; + ev->rbtree_parent = NULL; +#endif + + ev->timer_set = 0; +} + + +ngx_inline static void ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer) +{ + ngx_int_t key; + + key = (ngx_int_t) + (ngx_elapsed_msec / NGX_TIMER_RESOLUTION * NGX_TIMER_RESOLUTION + + timer) / NGX_TIMER_RESOLUTION; +#if 0 + (ngx_elapsed_msec + timer) / NGX_TIMER_RESOLUTION; +#endif + + if (ev->timer_set) { + + /* + * Use the previous timer value if a difference between them is less + * then 100 milliseconds. It allows to minimize the rbtree operations + * for the fast connections. + */ + + if (abs(key - ev->rbtree_key) < 100 / NGX_TIMER_RESOLUTION) { + ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "event timer: %d, old: %d, new: %d", + ngx_event_ident(ev->data), ev->rbtree_key, key); + return; + } + + ngx_del_timer(ev); + } + + ev->rbtree_key = key; + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "event timer add: %d: %d", + ngx_event_ident(ev->data), ev->rbtree_key); + + if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) { + return; + } + + ngx_rbtree_insert((ngx_rbtree_t **) &ngx_event_timer_rbtree, + &ngx_event_timer_sentinel, + (ngx_rbtree_t *) &ev->rbtree_key); + + ngx_mutex_unlock(ngx_event_timer_mutex); + + ev->timer_set = 1; +} + + +#endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */