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Annotation of embedaddon/nginx/src/event/ngx_event_timer.h, revision 1.1.1.1

1.1       misho       1: 
                      2: /*
                      3:  * Copyright (C) Igor Sysoev
                      4:  * Copyright (C) Nginx, Inc.
                      5:  */
                      6: 
                      7: 
                      8: #ifndef _NGX_EVENT_TIMER_H_INCLUDED_
                      9: #define _NGX_EVENT_TIMER_H_INCLUDED_
                     10: 
                     11: 
                     12: #include <ngx_config.h>
                     13: #include <ngx_core.h>
                     14: #include <ngx_event.h>
                     15: 
                     16: 
                     17: #define NGX_TIMER_INFINITE  (ngx_msec_t) -1
                     18: 
                     19: #define NGX_TIMER_LAZY_DELAY  300
                     20: 
                     21: 
                     22: ngx_int_t ngx_event_timer_init(ngx_log_t *log);
                     23: ngx_msec_t ngx_event_find_timer(void);
                     24: void ngx_event_expire_timers(void);
                     25: 
                     26: 
                     27: #if (NGX_THREADS)
                     28: extern ngx_mutex_t  *ngx_event_timer_mutex;
                     29: #endif
                     30: 
                     31: 
                     32: extern ngx_thread_volatile ngx_rbtree_t  ngx_event_timer_rbtree;
                     33: 
                     34: 
                     35: static ngx_inline void
                     36: ngx_event_del_timer(ngx_event_t *ev)
                     37: {
                     38:     ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
                     39:                    "event timer del: %d: %M",
                     40:                     ngx_event_ident(ev->data), ev->timer.key);
                     41: 
                     42:     ngx_mutex_lock(ngx_event_timer_mutex);
                     43: 
                     44:     ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
                     45: 
                     46:     ngx_mutex_unlock(ngx_event_timer_mutex);
                     47: 
                     48: #if (NGX_DEBUG)
                     49:     ev->timer.left = NULL;
                     50:     ev->timer.right = NULL;
                     51:     ev->timer.parent = NULL;
                     52: #endif
                     53: 
                     54:     ev->timer_set = 0;
                     55: }
                     56: 
                     57: 
                     58: static ngx_inline void
                     59: ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
                     60: {
                     61:     ngx_msec_t      key;
                     62:     ngx_msec_int_t  diff;
                     63: 
                     64:     key = ngx_current_msec + timer;
                     65: 
                     66:     if (ev->timer_set) {
                     67: 
                     68:         /*
                     69:          * Use a previous timer value if difference between it and a new
                     70:          * value is less than NGX_TIMER_LAZY_DELAY milliseconds: this allows
                     71:          * to minimize the rbtree operations for fast connections.
                     72:          */
                     73: 
                     74:         diff = (ngx_msec_int_t) (key - ev->timer.key);
                     75: 
                     76:         if (ngx_abs(diff) < NGX_TIMER_LAZY_DELAY) {
                     77:             ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
                     78:                            "event timer: %d, old: %M, new: %M",
                     79:                             ngx_event_ident(ev->data), ev->timer.key, key);
                     80:             return;
                     81:         }
                     82: 
                     83:         ngx_del_timer(ev);
                     84:     }
                     85: 
                     86:     ev->timer.key = key;
                     87: 
                     88:     ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
                     89:                    "event timer add: %d: %M:%M",
                     90:                     ngx_event_ident(ev->data), timer, ev->timer.key);
                     91: 
                     92:     ngx_mutex_lock(ngx_event_timer_mutex);
                     93: 
                     94:     ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);
                     95: 
                     96:     ngx_mutex_unlock(ngx_event_timer_mutex);
                     97: 
                     98:     ev->timer_set = 1;
                     99: }
                    100: 
                    101: 
                    102: #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */