static ngx_int_t ngx_http_file_cache_manage_file(ngx_tree_ctx_t *ctx, ngx_str_t *path) { ngx_msec_t elapsed; ngx_http_file_cache_t *cache; cache = ctx->data; if (ngx_http_file_cache_add_file(ctx, path) != NGX_OK) { (void) ngx_http_file_cache_delete_file(ctx, path); } if (++cache->files >= cache->loader_files) { ngx_http_file_cache_loader_sleep(cache); } else { ngx_time_update(); elapsed = ngx_abs((ngx_msec_int_t) (ngx_current_msec - cache->last)); ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0, "http file cache loader time elapsed: %M", elapsed); if (elapsed >= cache->loader_threshold) { ngx_http_file_cache_loader_sleep(cache); } } return (ngx_quit || ngx_terminate) ? NGX_ABORT : NGX_OK; }
/* 将文件添加到系统的file_cache管理中 * 参数path: 为普通文件的完整路径 */ static ngx_int_t ngx_http_file_cache_manage_file(ngx_tree_ctx_t *ctx, ngx_str_t *path) { ngx_msec_t elapsed; ngx_http_file_cache_t *cache; cache = ctx->data; // 添加文件到file_cache中,建立node节点在红黑树中 if (ngx_http_file_cache_add_file(ctx, path) != NGX_OK) { (void) ngx_http_file_cache_delete_file(ctx, path); } // 统计缓存文件并检查是否达到系统限制 if (++cache->files >= cache->loader_files) { // why?? 为什么加载的cache文件达到限制后,将休眠并将 cache->files 的个数清零呢??? ngx_http_file_cache_loader_sleep(cache); } else { ngx_time_update(); elapsed = ngx_abs((ngx_msec_int_t) (ngx_current_msec - cache->last)); ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0, "http file cache loader time elapsed: %M", elapsed); if (elapsed >= cache->loader_threshold) { ngx_http_file_cache_loader_sleep(cache); } } return (ngx_quit || ngx_terminate) ? NGX_ABORT : NGX_OK; }