static void
ngx_open_file_cache_remove(ngx_event_t *ev)
{
ngx_cached_open_file_t *file;
ngx_open_file_cache_event_t *fev;
fev = ev->data;
file = fev->file;
ngx_queue_remove(&file->queue);
ngx_rbtree_delete(&fev->cache->rbtree, &file->node);
fev->cache->current--;
/* NGX_ONESHOT_EVENT was already deleted */
file->event = NULL;
file->use_event = 0;
file->close = 1;
ngx_close_cached_file(fev->cache, file, 0, ev->log);
/* free memory only when fev->cache and fev->file are already not needed */
ngx_free(ev->data);
ngx_free(ev);
}
static void
ngx_open_file_cache_cleanup(void *data)
{
ngx_open_file_cache_t *cache = data;
ngx_queue_t *q;
ngx_cached_open_file_t *file;
ngx_log_debug0(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
"open file cache cleanup");
for ( ;; ) {
if (ngx_queue_empty(&cache->expire_queue)) {
break;
}
q = ngx_queue_last(&cache->expire_queue);
file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
ngx_queue_remove(q);
ngx_rbtree_delete(&cache->rbtree, &file->node);
cache->current--;
ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, 0,
"delete cached open file: %s", file->name);
if (!file->err && !file->is_dir) {
file->close = 1;
file->count = 0;
ngx_close_cached_file(cache, file, 0, ngx_cycle->log);
} else {
ngx_free(file->name);
ngx_free(file);
}
}
if (cache->current) {
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
"%ui items still leave in open file cache",
cache->current);
}
if (cache->rbtree.root != cache->rbtree.sentinel) {
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
"rbtree still is not empty in open file cache");
}
}
static void
ngx_open_file_cleanup(void *data)
{
ngx_open_file_cache_cleanup_t *c = data;
c->file->count--;
ngx_close_cached_file(c->cache, c->file, c->min_uses, c->log);
/* drop one or two expired open files */
ngx_expire_old_cached_files(c->cache, 1, c->log);
}
static void
ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n,
ngx_log_t *log)
{
time_t now;
ngx_queue_t *q;
ngx_cached_open_file_t *file;
now = ngx_time();
/*
* n == 1 deletes one or two inactive files
* n == 0 deletes least recently used file by force
* and one or two inactive files
*/
while (n < 3) {
// 如果队列为空，则直接返回
if (ngx_queue_empty(&cache->expire_queue)) {
return;
}
// 取出最后一个文件，也就是可能需要被超时的文件
// (因为尾部是最长时间没有操作的文件)
q = ngx_queue_last(&cache->expire_queue);
file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
// n是控制是强制超时，还是按inactive超时，后一个判断是判断是否超时
if (n++ != 0 && now - file->accessed <= cache->inactive) {
return;
}
// 如果有超时的，或者需要强制超时，则开始从队列和红黑树中移除
ngx_queue_remove(q);
ngx_rbtree_delete(&cache->rbtree, &file->node);
cache->current--;
ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
"expire cached open file: %s", file->name);
if (!file->err && !file->is_dir) {
file->close = 1;
// 关闭文件
ngx_close_cached_file(cache, file, 0, log);
} else {
ngx_free(file->name);
ngx_free(file);
}
}
}
static void
ngx_expire_old_cached_files(ngx_open_file_cache_t *cache, ngx_uint_t n,
ngx_log_t *log)
{
time_t now;
ngx_queue_t *q;
ngx_cached_open_file_t *file;
now = ngx_time();
/*
* n == 1 deletes one or two inactive files
* n == 0 deletes least recently used file by force
* and one or two inactive files
*/
while (n < 3) {
if (ngx_queue_empty(&cache->expire_queue)) {
return;
}
q = ngx_queue_last(&cache->expire_queue);
file = ngx_queue_data(q, ngx_cached_open_file_t, queue);
if (n++ != 0 && now - file->accessed <= cache->inactive) {
return;
}
ngx_queue_remove(q);
ngx_rbtree_delete(&cache->rbtree, &file->node);
cache->current--;
ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
"expire cached open file: %s", file->name);
if (!file->err && !file->is_dir) {
file->close = 1;
ngx_close_cached_file(cache, file, 0, log);
} else {
ngx_free(file->name);
ngx_free(file);
}
}
}
