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src/event/ngx_event_timer.h - nginx-1.7.10

Functions defined

Macros defined

Source code


  2. /*
  3. * Copyright (C) Igor Sysoev
  4. * Copyright (C) Nginx, Inc.
  5. */


  8. #ifndef _NGX_EVENT_TIMER_H_INCLUDED_
  9. ‌#define _NGX_EVENT_TIMER_H_INCLUDED_


  12. #include <ngx_config.h>
  13. #include <ngx_core.h>
  14. #include <ngx_event.h>


  17. ‌#define NGX_TIMER_INFINITE  (ngx_msec_t) -1

  19. ‌#define NGX_TIMER_LAZY_DELAY  300


  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. void ngx_event_cancel_timers(void);


  28. extern ngx_rbtree_t  ngx_event_timer_rbtree;


  31. static ngx_inline void
  32. ‌ngx_event_del_timer(ngx_event_t *ev)
  33. {
  34.     ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
  35.                    "event timer del: %d: %M",
  36.                     ngx_event_ident(ev->data), ev->timer.key);

  38.     ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);

  40. #if (NGX_DEBUG)
  41.     ev->timer.left = NULL;
  42.     ev->timer.right = NULL;
  43.     ev->timer.parent = NULL;
  44. #endif

  46.     ev->timer_set = 0;
  47. }


  50. static ngx_inline void
  51. ‌ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
  52. {
  53.     ngx_msec_t      key;
  54.     ngx_msec_int_t  diff;

  56.     key = ngx_current_msec + timer;

  58.     if (ev->timer_set) {

  60.         /*
  61.          * Use a previous timer value if difference between it and a new
  62.          * value is less than NGX_TIMER_LAZY_DELAY milliseconds: this allows
  63.          * to minimize the rbtree operations for fast connections.
  64.          */

  66.         diff = (ngx_msec_int_t) (key - ev->timer.key);

  68.         if (ngx_abs(diff) < NGX_TIMER_LAZY_DELAY) {
  69.             ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
  70.                            "event timer: %d, old: %M, new: %M",
  71.                             ngx_event_ident(ev->data), ev->timer.key, key);
  72.             return;
  73.         }

  75.         ngx_del_timer(ev);
  76.     }

  78.     ev->timer.key = key;

  80.     ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
  81.                    "event timer add: %d: %M:%M",
  82.                     ngx_event_ident(ev->data), timer, ev->timer.key);

  84.     ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);

  86.     ev->timer_set = 1;
  87. }


  90. #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */

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