new file mode 100644
--- /dev/null
+++ b/src/core/ngx_cycle.c
@@ -0,0 +1,743 @@
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+/* STUB */
+#include <nginx.h>
+
+
+static void ngx_clean_old_cycles(ngx_event_t *ev);
+
+
+volatile ngx_cycle_t  *ngx_cycle;
+ngx_array_t            ngx_old_cycles;
+
+static ngx_pool_t     *ngx_temp_pool;
+static ngx_event_t     ngx_cleaner_event;
+
+
+/* STUB NAME */
+static ngx_connection_t  dumb;
+/* STUB */
+
+
+ngx_cycle_t *ngx_init_cycle(ngx_cycle_t *old_cycle)
+{
+    ngx_int_t         i, n, failed;
+    ngx_str_t         conf_file;
+    ngx_log_t        *log;
+    ngx_conf_t        conf;
+    ngx_pool_t       *pool;
+    ngx_cycle_t      *cycle, **old;
+    ngx_socket_t      fd;
+    ngx_open_file_t  *file;
+    ngx_listening_t  *ls, *nls;
+
+    log = old_cycle->log;
+
+    if (!(pool = ngx_create_pool(16 * 1024, log))) {
+        return NULL;
+    }
+
+    if (!(cycle = ngx_pcalloc(pool, sizeof(ngx_cycle_t)))) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+    cycle->pool = pool;
+
+    cycle->old_cycle = old_cycle;
+
+
+    n = old_cycle->pathes.nelts ? old_cycle->pathes.nelts : 10;
+    if (!(cycle->pathes.elts = ngx_pcalloc(pool, n * sizeof(ngx_path_t *)))) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+    cycle->pathes.nelts = 0;
+    cycle->pathes.size = sizeof(ngx_path_t *);
+    cycle->pathes.nalloc = n;
+    cycle->pathes.pool = pool;
+
+
+    n = old_cycle->open_files.nelts ? old_cycle->open_files.nelts : 20;
+    cycle->open_files.elts = ngx_pcalloc(pool, n * sizeof(ngx_open_file_t));
+    if (cycle->open_files.elts == NULL) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+    cycle->open_files.nelts = 0;
+    cycle->open_files.size = sizeof(ngx_open_file_t);
+    cycle->open_files.nalloc = n;
+    cycle->open_files.pool = pool;
+
+
+    if (!(cycle->log = ngx_log_create_errlog(cycle, NULL))) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+
+
+    n = old_cycle->listening.nelts ? old_cycle->listening.nelts : 10;
+    cycle->listening.elts = ngx_pcalloc(pool, n * sizeof(ngx_listening_t));
+    if (cycle->listening.elts == NULL) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+    cycle->listening.nelts = 0;
+    cycle->listening.size = sizeof(ngx_listening_t);
+    cycle->listening.nalloc = n;
+    cycle->listening.pool = pool;
+
+
+    cycle->conf_ctx = ngx_pcalloc(pool, ngx_max_module * sizeof(void *));
+    if (cycle->conf_ctx == NULL) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+
+
+    if (ngx_core_module.init_module(cycle) == NGX_ERROR) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+
+
+    ngx_memzero(&conf, sizeof(ngx_conf_t));
+    /* STUB: init array ? */
+    conf.args = ngx_create_array(pool, 10, sizeof(ngx_str_t));
+    if (conf.args == NULL) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+
+    conf.ctx = cycle->conf_ctx;
+    conf.cycle = cycle;
+    /* STUB */ conf.pool = cycle->pool;
+    conf.log = log;
+    conf.module_type = NGX_CORE_MODULE;
+    conf.cmd_type = NGX_MAIN_CONF;
+
+    conf_file.len = sizeof(NGINX_CONF) - 1;
+    conf_file.data = NGINX_CONF;
+
+    if (ngx_conf_parse(&conf, &conf_file) != NGX_CONF_OK) {
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+
+
+    failed = 0;
+
+    file = cycle->open_files.elts;
+    for (i = 0; i < cycle->open_files.nelts; i++) {
+        if (file[i].name.data == NULL) {
+            continue;
+        }
+
+        file[i].fd = ngx_open_file(file[i].name.data,
+                                   NGX_FILE_RDWR,
+                                   NGX_FILE_CREATE_OR_OPEN|NGX_FILE_APPEND);
+
+ngx_log_debug(log, "OPEN: %d:%s" _ file[i].fd _ file[i].name.data);
+
+        if (file[i].fd == NGX_INVALID_FILE) {
+            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
+                          ngx_open_file_n " \"%s\" failed",
+                          file[i].name.data);
+            failed = 1;
+            break;
+        }
+
+#if (WIN32)
+        if (ngx_file_append_mode(file[i].fd) == NGX_ERROR) {
+            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
+                          ngx_file_append_mode_n " \"%s\" failed",
+                          file[i].name.data);
+            failed = 1;
+            break;
+        }
+#endif
+    }
+
+    if (!failed) {
+        if (old_cycle->listening.nelts) {
+            ls = old_cycle->listening.elts;
+            for (i = 0; i < old_cycle->listening.nelts; i++) {
+                ls[i].remain = 0;
+            }
+
+            nls = cycle->listening.elts;
+            for (n = 0; n < cycle->listening.nelts; n++) {
+                for (i = 0; i < old_cycle->listening.nelts; i++) {
+                    if (ls[i].ignore) {
+                        continue;
+                    }
+
+                    ngx_log_error(NGX_LOG_INFO, log, 0,
+                                   "%X, %X",
+                                   *(int *) ls[i].sockaddr,
+                                   *(int *) nls[n].sockaddr);
+
+                    if (ngx_memcmp(nls[n].sockaddr,
+                                   ls[i].sockaddr, ls[i].socklen) == 0)
+                    {
+                        fd = ls[i].fd;
+#if (WIN32)
+                        /*
+                         * Winsock assignes a socket number divisible by 4 so
+                         * to find a connection we divide a socket number by 4.
+                         */
+
+                        fd /= 4;
+#endif
+                        if (fd >= (ngx_socket_t) cycle->connection_n) {
+                            ngx_log_error(NGX_LOG_EMERG, log, 0,
+                                        "%d connections is not enough to hold "
+                                        "an open listening socket on %s, "
+                                        "required at least %d connections",
+                                        cycle->connection_n,
+                                        ls[i].addr_text.data, fd);
+                            failed = 1;
+                            break;
+                        }
+
+                        nls[n].fd = ls[i].fd;
+                        nls[i].remain = 1;
+                        ls[i].remain = 1;
+                        break;
+                    }
+                }
+
+                if (nls[n].fd == -1) {
+                    nls[n].new = 1;
+                }
+            }
+
+        } else {
+            ls = cycle->listening.elts;
+            for (i = 0; i < cycle->listening.nelts; i++) {
+                ls[i].new = 1;
+            }
+        }
+
+        if (!failed) {
+            if (ngx_open_listening_sockets(cycle) == NGX_ERROR) {
+                failed = 1;
+            }
+        }
+    }
+
+    if (failed) {
+
+        /* rollback the new cycle configuration */
+
+        file = cycle->open_files.elts;
+        for (i = 0; i < cycle->open_files.nelts; i++) {
+            if (file[i].fd == NGX_INVALID_FILE) {
+                continue;
+            }
+
+            if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
+                ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
+                              ngx_close_file_n " \"%s\" failed",
+                              file[i].name.data);
+            }
+        }
+
+        ls = cycle->listening.elts;
+        for (i = 0; i < cycle->listening.nelts; i++) {
+            if (ls[i].new && ls[i].fd == -1) {
+                continue;
+            }
+
+            if (ngx_close_socket(ls[i].fd) == -1) {
+                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+                              ngx_close_socket_n " %s failed",
+                              ls[i].addr_text.data);
+            }
+        }
+
+        ngx_destroy_pool(pool);
+        return NULL;
+    }
+
+    /* commit the new cycle configuration */
+
+    pool->log = cycle->log;
+
+
+    for (i = 0; ngx_modules[i]; i++) {
+        if (ngx_modules[i]->init_module) {
+            if (ngx_modules[i]->init_module(cycle) == NGX_ERROR) {
+                /* fatal */
+                exit(1);
+            }
+        }
+    }
+
+    /* close and delete stuff that lefts from an old cycle */
+
+    /* close the unneeded listening sockets */
+
+    ls = old_cycle->listening.elts;
+    for (i = 0; i < old_cycle->listening.nelts; i++) {
+        if (ls[i].remain) {
+            continue;
+        }
+
+        if (ngx_close_socket(ls[i].fd) == -1) {
+            ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+                          ngx_close_socket_n " %s failed",
+                          ls[i].addr_text.data);
+        }
+    }
+
+
+    /* close the unneeded open files */
+
+    file = old_cycle->open_files.elts;
+    for (i = 0; i < old_cycle->open_files.nelts; i++) {
+        if (file[i].fd == NGX_INVALID_FILE) {
+            continue;
+        }
+
+        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
+            ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
+                          ngx_close_file_n " \"%s\" failed",
+                          file[i].name.data);
+        }
+    }
+
+    if (old_cycle->connections == NULL) {
+        /* an old cycle is an init cycle */
+        ngx_destroy_pool(old_cycle->pool);
+        return cycle;
+    }
+
+    if (ngx_master) {
+        ngx_destroy_pool(old_cycle->pool);
+        return cycle;
+    }
+
+    if (ngx_temp_pool == NULL) {
+        ngx_temp_pool = ngx_create_pool(128, cycle->log);
+        if (ngx_temp_pool == NULL) {
+            ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
+                          "can not create ngx_temp_pool");
+            exit(1);
+        }
+
+        n = 10;
+        ngx_old_cycles.elts = ngx_pcalloc(ngx_temp_pool,
+                                          n * sizeof(ngx_cycle_t *));
+        if (ngx_old_cycles.elts == NULL) {
+            exit(1);
+        }
+        ngx_old_cycles.nelts = 0;
+        ngx_old_cycles.size = sizeof(ngx_cycle_t *);
+        ngx_old_cycles.nalloc = n;
+        ngx_old_cycles.pool = ngx_temp_pool;
+
+        ngx_cleaner_event.event_handler = ngx_clean_old_cycles;
+        ngx_cleaner_event.log = cycle->log;
+        ngx_cleaner_event.data = &dumb;
+        dumb.fd = (ngx_socket_t) -1;
+    }
+
+    ngx_temp_pool->log = cycle->log;
+
+    old = ngx_push_array(&ngx_old_cycles);
+    if (old == NULL) {
+        exit(1);
+    }
+    *old = old_cycle;
+
+    if (!ngx_cleaner_event.timer_set) {
+        ngx_add_timer(&ngx_cleaner_event, 30000);
+        ngx_cleaner_event.timer_set = 1;
+    }
+
+    return cycle;
+}
+
+
+#if 0
+
+
+static ngx_int_t ngx_set_inherited_sockets(ngx_cycle_t *cycle, char **envp)
+{
+    char                *p, *v;
+    ngx_socket_t         s;
+    ngx_listening_t     *ls;
+    struct sockaddr_in  *addr_in;
+
+    for ( /* void */ ; *envp; envp++) {
+        if (ngx_strncmp(*envp, NGINX_VAR, NGINX_VAR_LEN) != 0) {
+            continue;
+        }
+
+        ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
+                      "using inherited sockets from \"%s\"", *envp);
+
+        ngx_init_array(cycle->listening, cycle->pool,
+                       10, sizeof(ngx_listening_t), NGX_ERROR);
+
+        for (p = *envp + NGINX_VAR_LEN, v = p; *p; p++) {
+            if (*p == ':' || *p == ';') {
+                s = ngx_atoi(v, p - v);
+                if (s == NGX_ERROR) {
+                    ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
+                                  "invalid socket number \"%s\" "
+                                  "in NGINX enviroment variable, "
+                                  "ignoring the rest of the variable", v);
+                    break;
+                }
+                v = p + 1;
+
+                if (!(ls = ngx_push_array(&cycle->listening))) {
+                    return NGX_ERROR;
+                }
+
+                ls->fd = s;
+
+                /* AF_INET only */
+
+                ls->sockaddr = ngx_palloc(cycle->pool,
+                                          sizeof(struct sockaddr_in));
+                if (ls->sockaddr == NULL) {
+                    return NGX_ERROR;
+                }
+
+                ls->socklen = sizeof(struct sockaddr_in);
+                if (getsockname(s, ls->sockaddr, &ls->socklen) == -1) {
+                    ngx_log_error(NGX_LOG_CRIT, cycle->log, ngx_socket_errno,
+                                  "getsockname() of the inherited "
+                                  "socket #%d failed", s);
+                    ls->ignore = 1;
+                    continue;
+                }
+
+                addr_in = (struct sockaddr_in *) ls->sockaddr;
+
+                if (addr_in->sin_family != AF_INET) {
+                    ngx_log_error(NGX_LOG_CRIT, cycle->log, ngx_socket_errno,
+                                  "the inherited socket #%d has "
+                                  "unsupported family", s);
+                    ls->ignore = 1;
+                    continue;
+                }
+                ls->addr_text_max_len = INET_ADDRSTRLEN;
+
+                ls->addr_text.data = ngx_palloc(cycle->pool,
+                                                ls->addr_text_max_len);
+                if (ls->addr_text.data == NULL) {
+                    return NGX_ERROR;
+                }
+
+                addr_in->sin_len = 0;
+
+                ls->family = addr_in->sin_family;
+                ls->addr_text.len = ngx_sock_ntop(ls->family, ls->sockaddr,
+                                                  ls->addr_text.data,
+                                                  ls->addr_text_max_len);
+                if (ls->addr_text.len == 0) {
+                    return NGX_ERROR;
+                }
+            }
+        }
+
+        break;
+    }
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t ngx_open_listening_sockets(ngx_cycle_t *cycle)
+{
+    int              tries, failed, reuseaddr, i;
+    ngx_err_t        err;
+    ngx_log_t       *log;
+    ngx_socket_t     s;
+    ngx_listening_t *ls;
+
+    reuseaddr = 1;
+#if (NGX_SUPPRESS_WARN)
+    failed = 0;
+#endif
+
+    log = cycle->log;
+
+    /* TODO: tries configurable */
+
+    for (tries = 10; tries; tries--) {
+        failed = 0;
+
+        /* for each listening socket */
+
+        ls = cycle->listening.elts;
+        for (i = 0; i < cycle->listening.nelts; i++) {
+
+            if (ls[i].ignore) {
+                continue;
+            }
+
+            if (ls[i].fd != -1) {
+                continue;
+            }
+
+            if (ls[i].inherited) {
+
+                /* TODO: close on exit */
+                /* TODO: nonblocking */
+                /* TODO: deferred accept */
+
+                continue;
+            }
+
+            s = ngx_socket(ls[i].family, ls[i].type, ls[i].protocol,
+                           ls[i].flags);
+
+            if (s == -1) {
+                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+                              ngx_socket_n " %s failed", ls[i].addr_text.data);
+                return NGX_ERROR;
+            }
+
+#if (WIN32)
+            /*
+             * Winsock assignes a socket number divisible by 4
+             * so to find a connection we divide a socket number by 4.
+             */
+
+            if (s % 4) {
+                ngx_log_error(NGX_LOG_EMERG, ls->log, 0,
+                              ngx_socket_n " created socket %d", s);
+                return NGX_ERROR;
+            }
+#endif
+
+            if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
+                           (const void *) &reuseaddr, sizeof(int)) == -1) {
+                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+                              "setsockopt(SO_REUSEADDR) %s failed",
+                              ls[i].addr_text.data);
+                return NGX_ERROR;
+            }
+
+            /* TODO: close on exit */
+
+            if (!(ngx_event_flags & NGX_USE_AIO_EVENT)) {
+                if (ngx_nonblocking(s) == -1) {
+                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+                                  ngx_nonblocking_n " %s failed",
+                                  ls[i].addr_text.data);
+                    return NGX_ERROR;
+                }
+            }
+
+#if 0
+            if (ls[i].nonblocking) {
+                if (ngx_nonblocking(s) == -1) {
+                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+                                  ngx_nonblocking_n " %s failed",
+                                  ls[i].addr_text.data);
+                    return NGX_ERROR;
+                }
+            }
+#endif
+
+            if (bind(s, ls[i].sockaddr, ls[i].socklen) == -1) {
+                err = ngx_socket_errno;
+                ngx_log_error(NGX_LOG_EMERG, log, err,
+                              "bind() to %s failed", ls[i].addr_text.data);
+
+                if (err != NGX_EADDRINUSE)
+                    return NGX_ERROR;
+
+                if (ngx_close_socket(s) == -1)
+                    ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+                                  ngx_close_socket_n " %s failed",
+                                  ls[i].addr_text.data);
+
+                failed = 1;
+                continue;
+            }
+
+            if (listen(s, ls[i].backlog) == -1) {
+                ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
+                              "listen() to %s failed", ls[i].addr_text.data);
+                return NGX_ERROR;
+            }
+
+            /* TODO: deferred accept */
+
+            ls[i].fd = s;
+        }
+
+        if (!failed)
+            break;
+
+        /* TODO: delay configurable */
+
+        ngx_log_error(NGX_LOG_NOTICE, log, 0,
+                      "try again to bind() after 500ms");
+        ngx_msleep(500);
+    }
+
+    if (failed) {
+        ngx_log_error(NGX_LOG_EMERG, log, 0, "still can not bind()");
+        return NGX_ERROR;
+    }
+
+    return NGX_OK;
+}
+
+
+#endif
+
+
+void ngx_reopen_files(ngx_cycle_t *cycle)
+{
+    ngx_fd_t          fd;
+    ngx_int_t         i;
+    ngx_open_file_t  *file;
+
+    file = cycle->open_files.elts;
+    for (i = 0; i < cycle->open_files.nelts; i++) {
+        if (file[i].name.data == NULL) {
+            continue;
+        }
+
+        fd = ngx_open_file(file[i].name.data, NGX_FILE_RDWR,
+                           NGX_FILE_CREATE_OR_OPEN|NGX_FILE_APPEND);
+
+        ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                       "reopen file \"%s\", old:%d new:%d",
+                       file[i].name.data, file[i].fd, fd);
+
+        if (fd == NGX_INVALID_FILE) {
+            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
+                          ngx_open_file_n " \"%s\" failed", file[i].name.data);
+            continue;
+        }
+
+#if (WIN32)
+        if (ngx_file_append_mode(fd) == NGX_ERROR) {
+            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
+                          ngx_file_append_mode_n " \"%s\" failed",
+                          file[i].name.data);
+
+            if (ngx_close_file(fd) == NGX_FILE_ERROR) {
+                ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
+                              ngx_close_file_n " \"%s\" failed",
+                              file[i].name.data);
+            }
+
+            continue;
+        }
+#endif
+
+        if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
+            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
+                          ngx_close_file_n " \"%s\" failed",
+                          file[i].name.data);
+        }
+
+        file[i].fd = fd;
+    }
+}
+
+
+#if 0
+
+static void ngx_close_listening_sockets(ngx_cycle_t *cycle)
+{
+    ngx_int_t         i;
+    ngx_socket_t      fd;
+    ngx_listening_t  *ls;
+
+    if (ngx_event_flags & NGX_USE_IOCP_EVENT) {
+        return;
+    }
+
+    ls = cycle->listening.elts;
+    for (i = 0; i < cycle->listening.nelts; i++) {
+        fd = ls[i].fd;
+
+#if (WIN32)
+        /*
+         * Winsock assignes a socket number divisible by 4
+         * so to find a connection we divide a socket number by 4.
+         */
+
+        fd /= 4;
+#endif
+
+        ngx_del_event(&cycle->read_events[fd], NGX_READ_EVENT, NGX_CLOSE_EVENT);
+
+        if (ngx_close_socket(ls[i].fd) == -1) {
+            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
+                          ngx_close_socket_n " %s failed",
+                          ls[i].addr_text.data);
+        }
+
+        cycle->connections[fd].fd = -1;
+    }
+}
+
+#endif
+
+
+static void ngx_clean_old_cycles(ngx_event_t *ev)
+{
+    int            i, n, found, live;
+    ngx_log_t     *log;
+    ngx_cycle_t  **cycle;
+
+    log = ngx_cycle->log;
+    ngx_temp_pool->log = log;
+
+    ngx_log_debug(log, "clean old cycles");
+
+    live = 0;
+
+    cycle = ngx_old_cycles.elts;
+    for (i = 0; i < ngx_old_cycles.nelts; i++) {
+
+        if (cycle[i] == NULL) {
+            continue;
+        }
+
+        found = 0;
+
+        for (n = 0; n < cycle[i]->connection_n; n++) {
+            if (cycle[i]->connections[n].fd != -1) {
+                found = 1;
+                ngx_log_debug(log, "live fd: %d" _ n);
+                break;
+            }
+        }
+
+        if (found) {
+            live = 1;
+            continue;
+        }
+
+        ngx_log_debug(log, "clean old cycle: %d" _ i);
+        ngx_destroy_pool(cycle[i]->pool);
+        cycle[i] = NULL;
+    }
+
+    ngx_log_debug(log, "old cycles status: %d" _ live);
+
+    if (live) {
+        ngx_log_debug(log, "TIMER");
+        ngx_add_timer(ev, 30000);
+
+    } else {
+        ngx_destroy_pool(ngx_temp_pool);
+        ngx_temp_pool = NULL;
+        ngx_old_cycles.nelts = 0;
+    }
+}