nginx/src/event/ngx_event_timer.c

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/*
* Copyright (C) Igor Sysoev
*/
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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
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#if (NGX_THREADS)
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ngx_mutex_t *ngx_event_timer_mutex;
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#endif
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ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
static ngx_rbtree_node_t ngx_event_timer_sentinel;
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ngx_int_t
ngx_event_timer_init(ngx_log_t *log)
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{
ngx_event_timer_rbtree.root = &ngx_event_timer_sentinel;
ngx_event_timer_rbtree.sentinel = &ngx_event_timer_sentinel;
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ngx_event_timer_rbtree.insert = ngx_rbtree_insert_timer_value;
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#if (NGX_THREADS)
if (ngx_event_timer_mutex) {
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ngx_event_timer_mutex->log = log;
return NGX_OK;
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}
ngx_event_timer_mutex = ngx_mutex_init(log, 0);
if (ngx_event_timer_mutex == NULL) {
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return NGX_ERROR;
}
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#endif
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return NGX_OK;
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}
ngx_msec_t
ngx_event_find_timer(void)
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{
ngx_msec_int_t timer;
ngx_rbtree_node_t *node, *root, *sentinel;
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if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {
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return NGX_TIMER_INFINITE;
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}
ngx_mutex_lock(ngx_event_timer_mutex);
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root = ngx_event_timer_rbtree.root;
sentinel = ngx_event_timer_rbtree.sentinel;
node = ngx_rbtree_min(root, sentinel);
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ngx_mutex_unlock(ngx_event_timer_mutex);
timer = (ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec;
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return (ngx_msec_t) (timer > 0 ? timer : 0);
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}
void
ngx_event_expire_timers(void)
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{
ngx_event_t *ev;
ngx_rbtree_node_t *node, *root, *sentinel;
sentinel = ngx_event_timer_rbtree.sentinel;
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for ( ;; ) {
ngx_mutex_lock(ngx_event_timer_mutex);
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root = ngx_event_timer_rbtree.root;
if (root == sentinel) {
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return;
}
node = ngx_rbtree_min(root, sentinel);
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/* node->key <= ngx_current_time */
if ((ngx_msec_int_t) node->key - (ngx_msec_int_t) ngx_current_msec <= 0)
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{
ev = (ngx_event_t *) ((char *) node - offsetof(ngx_event_t, timer));
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#if (NGX_THREADS)
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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.
*/
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event %p is busy in expire timers", ev);
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break;
}
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#endif
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event timer del: %d: %M",
ngx_event_ident(ev->data), ev->timer.key);
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ngx_rbtree_delete(&ngx_event_timer_rbtree, &ev->timer);
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ngx_mutex_unlock(ngx_event_timer_mutex);
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#if (NGX_DEBUG)
ev->timer.left = NULL;
ev->timer.right = NULL;
ev->timer.parent = NULL;
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#endif
ev->timer_set = 0;
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#if (NGX_THREADS)
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if (ngx_threaded) {
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ev->posted_timedout = 1;
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ngx_post_event(ev, &ngx_posted_events);
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ngx_unlock(ev->lock);
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continue;
}
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#endif
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ev->timedout = 1;
nginx-0.1.29-RELEASE import *) Feature: the ngx_http_ssi_module supports "include virtual" command. *) Feature: the ngx_http_ssi_module supports the condition command like 'if expr="$NAME"' and "else" and "endif" commands. Only one nested level is supported. *) Feature: the ngx_http_ssi_module supports the DATE_LOCAL and DATE_GMT variables and "config timefmt" command. *) Feature: the "ssi_ignore_recycled_buffers" directive. *) Bugfix: the "echo" command did not show the default value for the empty QUERY_STRING variable. *) Change: the ngx_http_proxy_module was rewritten. *) Feature: the "proxy_redirect", "proxy_pass_request_headers", "proxy_pass_request_body", and "proxy_method" directives. *) Feature: the "proxy_set_header" directive. The "proxy_x_var" was canceled and must be replaced with the proxy_set_header directive. *) Change: the "proxy_preserve_host" is canceled and must be replaced with the "proxy_set_header Host $host" and the "proxy_redirect off" directives, the "proxy_set_header Host $host:$proxy_port" directive and the appropriate proxy_redirect directives. *) Change: the "proxy_set_x_real_ip" is canceled and must be replaced with the "proxy_set_header X-Real-IP $remote_addr" directive. *) Change: the "proxy_add_x_forwarded_for" is canceled and must be replaced with the "proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for" directive. *) Change: the "proxy_set_x_url" is canceled and must be replaced with the "proxy_set_header X-URL http://$host:$server_port$request_uri" directive. *) Feature: the "fastcgi_param" directive. *) Change: the "fastcgi_root", "fastcgi_set_var" and "fastcgi_params" directive are canceled and must be replaced with the fastcgi_param directives. *) Feature: the "index" directive can use the variables. *) Feature: the "index" directive can be used at http and server levels. *) Change: the last index only in the "index" directive can be absolute. *) Feature: the "rewrite" directive can use the variables. *) Feature: the "internal" directive. *) Feature: the CONTENT_LENGTH, CONTENT_TYPE, REMOTE_PORT, SERVER_ADDR, SERVER_PORT, SERVER_PROTOCOL, DOCUMENT_ROOT, SERVER_NAME, REQUEST_METHOD, REQUEST_URI, and REMOTE_USER variables. *) Change: nginx now passes the invalid lines in a client request headers or a backend response header. *) Bugfix: if the backend did not transfer response for a long time and the "send_timeout" was less than "proxy_read_timeout", then nginx returned the 408 response. *) Bugfix: the segmentation fault was occurred if the backend sent an invalid line in response header; the bug had appeared in 0.1.26. *) Bugfix: the segmentation fault may occurred in FastCGI fault tolerance configuration. *) Bugfix: the "expires" directive did not remove the previous "Expires" and "Cache-Control" headers. *) Bugfix: nginx did not take into account trailing dot in "Host" header line. *) Bugfix: the ngx_http_auth_module did not work under Linux. *) Bugfix: the rewrite directive worked incorrectly, if the arguments were in a request. *) Bugfix: nginx could not be built on MacOS X.
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ev->handler(ev);
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continue;
}
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break;
}
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ngx_mutex_unlock(ngx_event_timer_mutex);
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}