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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #ifndef _NGX_EVENT_TIMER_H_INCLUDED_
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8 #define _NGX_EVENT_TIMER_H_INCLUDED_
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13 #include <ngx_event.h>
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14
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15
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50
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16 #define NGX_TIMER_INFINITE (ngx_msec_t) -1
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0
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17
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42
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18 #define NGX_TIMER_LAZY_DELAY 300
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19
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0
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20
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21 ngx_int_t ngx_event_timer_init(ngx_log_t *log);
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22 ngx_msec_t ngx_event_find_timer(void);
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106
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23 void ngx_event_expire_timers(void);
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0
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24
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25
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26 #if (NGX_THREADS)
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27 extern ngx_mutex_t *ngx_event_timer_mutex;
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28 #endif
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29
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30
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108
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31 extern ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
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32
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33
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42
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34 static ngx_inline void
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35 ngx_event_del_timer(ngx_event_t *ev)
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36 {
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37 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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106
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38 "event timer del: %d: %M",
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108
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39 ngx_event_ident(ev->data), ev->timer.key);
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40
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112
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41 ngx_mutex_lock(ngx_event_timer_mutex);
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42
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108
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43 ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
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44
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45 ngx_mutex_unlock(ngx_event_timer_mutex);
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46
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47 #if (NGX_DEBUG)
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108
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48 ev->timer.left = NULL;
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49 ev->timer.right = NULL;
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50 ev->timer.parent = NULL;
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51 #endif
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52
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53 ev->timer_set = 0;
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54 }
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55
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56
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42
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57 static ngx_inline void
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58 ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
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59 {
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110
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60 ngx_msec_t key;
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61 ngx_msec_int_t diff;
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62
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112
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63 key = ngx_current_msec + timer;
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64
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65 if (ev->timer_set) {
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66
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67 /*
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68 * Use the previous timer value if a difference between them is less
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42
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69 * then NGX_TIMER_LAZY_DELAY milliseconds. It allows to minimize
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70 * the rbtree operations for the fast connections.
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71 */
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72
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110
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73 diff = (ngx_msec_int_t) (key - ev->timer.key);
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106
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74
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75 if (ngx_abs(diff) < NGX_TIMER_LAZY_DELAY) {
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76 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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106
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77 "event timer: %d, old: %M, new: %M",
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108
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78 ngx_event_ident(ev->data), ev->timer.key, key);
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79 return;
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80 }
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81
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82 ngx_del_timer(ev);
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83 }
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84
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108
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85 ev->timer.key = key;
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86
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106
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87 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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88 "event timer add: %d: %M:%M",
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108
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89 ngx_event_ident(ev->data), timer, ev->timer.key);
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90
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112
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91 ngx_mutex_lock(ngx_event_timer_mutex);
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92
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108
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93 ngx_rbtree_insert(&ngx_event_timer_rbtree, &ev->timer);
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94
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95 ngx_mutex_unlock(ngx_event_timer_mutex);
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96
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97 ev->timer_set = 1;
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98 }
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99
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100
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101 #endif /* _NGX_EVENT_TIMER_H_INCLUDED_ */
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