ngx_msleep        597 src/core/ngx_connection.c         ngx_msleep(500);
ngx_msleep        266 src/event/modules/ngx_win32_select_module.c         ngx_msleep(timer);
ngx_msleep       2013 src/http/ngx_http_file_cache.c     ngx_msleep(cache->loader_sleep);
ngx_msleep        248 src/os/unix/ngx_process_cycle.c             ngx_msleep(100);