new file mode 100644
--- /dev/null
+++ b/src/core/ngx_cycle.h
@@ -0,0 +1,36 @@
+#ifndef _NGX_CYCLE_H_INCLUDED_
+#define _NGX_CYCLE_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+struct ngx_cycle_s {
+    void           ****conf_ctx;
+    ngx_pool_t        *pool;
+    ngx_log_t         *log;
+    ngx_array_t        listening;
+    ngx_array_t        open_files;
+    ngx_array_t        pathes;
+
+    int                connection_n;
+    ngx_connection_t  *connections;
+    ngx_event_t       *read_events;
+    ngx_event_t       *write_events;
+
+    ngx_cycle_t       *old_cycle;
+
+    unsigned           one_process:1;
+};
+
+
+ngx_cycle_t *ngx_init_cycle(ngx_cycle_t *old_cycle);
+void ngx_reopen_files(ngx_cycle_t *cycle);
+
+
+extern volatile ngx_cycle_t  *ngx_cycle;
+extern ngx_array_t            ngx_old_cycles;
+
+
+#endif /* _NGX_CYCLE_H_INCLUDED_ */