Mercurial > hg > nginx-mail
diff src/event/ngx_event_timer.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 | 46833bd150cb |
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new file mode 100644 --- /dev/null +++ b/src/event/ngx_event_timer.c @@ -0,0 +1,165 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_event.h> + + +#if (NGX_THREADS) +ngx_mutex_t *ngx_event_timer_mutex; +#endif + + +ngx_thread_volatile ngx_rbtree_t *ngx_event_timer_rbtree; +ngx_rbtree_t ngx_event_timer_sentinel; + + +ngx_int_t ngx_event_timer_init(ngx_log_t *log) +{ + if (ngx_event_timer_rbtree) { +#if (NGX_THREADS) + ngx_event_timer_mutex->log = log; +#endif + return NGX_OK; + } + + ngx_event_timer_rbtree = &ngx_event_timer_sentinel; + +#if (NGX_THREADS) + if (!(ngx_event_timer_mutex = ngx_mutex_init(log, 0))) { + return NGX_ERROR; + } +#endif + + return NGX_OK; +} + + +ngx_msec_t ngx_event_find_timer(void) +{ + ngx_msec_t timer; + ngx_rbtree_t *node; + + if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) { + return NGX_TIMER_INFINITE; + } + + if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) { + return NGX_TIMER_ERROR; + } + + node = ngx_rbtree_min((ngx_rbtree_t *) ngx_event_timer_rbtree, + &ngx_event_timer_sentinel); + + ngx_mutex_unlock(ngx_event_timer_mutex); + + timer = (ngx_msec_t) + (node->key * NGX_TIMER_RESOLUTION - + ngx_elapsed_msec / NGX_TIMER_RESOLUTION * NGX_TIMER_RESOLUTION); +#if 0 + (node->key * NGX_TIMER_RESOLUTION - ngx_elapsed_msec); +#endif + + return timer > 0 ? timer: 0 ; +} + + +void ngx_event_expire_timers(ngx_msec_t timer) +{ + ngx_event_t *ev; + ngx_rbtree_t *node; + + if (timer < 0) { + /* avoid the endless loop if the time goes backward for some reason */ + timer = 0; + } + + for ( ;; ) { + + if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) { + return; + } + + if (ngx_mutex_lock(ngx_event_timer_mutex) == NGX_ERROR) { + return; + } + + node = ngx_rbtree_min((ngx_rbtree_t *) ngx_event_timer_rbtree, + &ngx_event_timer_sentinel); + + if (node->key <= (ngx_msec_t) + (ngx_old_elapsed_msec + timer) / NGX_TIMER_RESOLUTION) + { + ev = (ngx_event_t *) + ((char *) node - offsetof(ngx_event_t, rbtree_key)); + +#if (NGX_THREADS) + + if (ngx_threaded && ngx_trylock(ev->lock) == 0) { + + /* + * We can not change the timer of the event that is been + * handling by another thread. And we can not easy walk + * the rbtree to find a next expired timer so we exit the loop. + * However it should be rare case when the event that is + * been handling has expired timer. + */ + + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "event " PTR_FMT " is busy in expire timers", + ev); + break; + } +#endif + + ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, + "event timer del: %d: %d", + ngx_event_ident(ev->data), ev->rbtree_key); + + 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; + +#if (NGX_THREADS) + if (ngx_threaded) { + if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) { + return; + } + + ev->posted_timedout = 1; + ngx_post_event(ev); + + ngx_mutex_unlock(ngx_posted_events_mutex); + + ngx_unlock(ev->lock); + + continue; + } +#endif + + ev->timedout = 1; + + ev->event_handler(ev); + + continue; + } + + break; + } + + ngx_mutex_unlock(ngx_event_timer_mutex); +}