mirror of
https://github.com/nginx/nginx.git
synced 2024-12-17 23:27:49 +08:00
160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
|
|
/*
|
|
* Copyright (C) Igor Sysoev
|
|
* Copyright (C) Nginx, Inc.
|
|
*/
|
|
|
|
|
|
#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;
|
|
static ngx_rbtree_node_t ngx_event_timer_sentinel;
|
|
|
|
/*
|
|
* the event timer rbtree may contain the duplicate keys, however,
|
|
* it should not be a problem, because we use the rbtree to find
|
|
* a minimum timer value only
|
|
*/
|
|
|
|
ngx_int_t
|
|
ngx_event_timer_init(ngx_log_t *log)
|
|
{
|
|
ngx_rbtree_init(&ngx_event_timer_rbtree, &ngx_event_timer_sentinel,
|
|
ngx_rbtree_insert_timer_value);
|
|
|
|
#if (NGX_THREADS)
|
|
|
|
if (ngx_event_timer_mutex) {
|
|
ngx_event_timer_mutex->log = log;
|
|
return NGX_OK;
|
|
}
|
|
|
|
ngx_event_timer_mutex = ngx_mutex_init(log, 0);
|
|
if (ngx_event_timer_mutex == NULL) {
|
|
return NGX_ERROR;
|
|
}
|
|
|
|
#endif
|
|
|
|
return NGX_OK;
|
|
}
|
|
|
|
|
|
ngx_msec_t
|
|
ngx_event_find_timer(void)
|
|
{
|
|
ngx_msec_int_t timer;
|
|
ngx_rbtree_node_t *node, *root, *sentinel;
|
|
|
|
if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
|
|
return NGX_TIMER_INFINITE;
|
|
}
|
|
|
|
ngx_mutex_lock(ngx_event_timer_mutex);
|
|
|
|
root = ngx_event_timer_rbtree.root;
|
|
sentinel = ngx_event_timer_rbtree.sentinel;
|
|
|
|
node = ngx_rbtree_min(root, sentinel);
|
|
|
|
ngx_mutex_unlock(ngx_event_timer_mutex);
|
|
|
|
timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec;
|
|
|
|
return (ngx_msec_t) (timer > 0 ? timer : 0);
|
|
}
|
|
|
|
|
|
void
|
|
ngx_event_expire_timers(void)
|
|
{
|
|
ngx_event_t *ev;
|
|
ngx_rbtree_node_t *node, *root, *sentinel;
|
|
|
|
sentinel = ngx_event_timer_rbtree.sentinel;
|
|
|
|
for ( ;; ) {
|
|
|
|
ngx_mutex_lock(ngx_event_timer_mutex);
|
|
|
|
root = ngx_event_timer_rbtree.root;
|
|
|
|
if (root == sentinel) {
|
|
return;
|
|
}
|
|
|
|
node = ngx_rbtree_min(root, sentinel);
|
|
|
|
/* node->key <= ngx_current_time */
|
|
|
|
if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec <= 0)
|
|
{
|
|
ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
|
|
|
|
#if (NGX_THREADS)
|
|
|
|
if (ngx_threaded && ngx_trylock(ev->lock) == 0) {
|
|
|
|
/*
|
|
* We cannot change the timer of the event that is being
|
|
* handled by another thread. And we cannot easy walk
|
|
* the rbtree to find next expired timer so we exit the loop.
|
|
* However, it should be a rare case when the event that is
|
|
* being handled has an expired timer.
|
|
*/
|
|
|
|
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
"event %p is busy in expire timers", ev);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
|
|
"event timer del: %d: %M",
|
|
ngx_event_ident(ev->data), ev->timer.key);
|
|
|
|
ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
|
|
|
|
ngx_mutex_unlock(ngx_event_timer_mutex);
|
|
|
|
#if (NGX_DEBUG)
|
|
ev->timer.left = NULL;
|
|
ev->timer.right = NULL;
|
|
ev->timer.parent = NULL;
|
|
#endif
|
|
|
|
ev->timer_set = 0;
|
|
|
|
#if (NGX_THREADS)
|
|
if (ngx_threaded) {
|
|
ev->posted_timedout = 1;
|
|
|
|
ngx_post_event(ev, &ngx_posted_events);
|
|
|
|
ngx_unlock(ev->lock);
|
|
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
ev->timedout = 1;
|
|
|
|
ev->handler(ev);
|
|
|
|
continue;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
ngx_mutex_unlock(ngx_event_timer_mutex);
|
|
}
|