new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_process_cycle.c
@@ -0,0 +1,517 @@
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+
+
+static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx);
+static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data);
+#if (NGX_THREADS)
+static int ngx_worker_thread_cycle(void *data);
+#endif
+
+
+ngx_int_t     ngx_process;
+ngx_pid_t     ngx_pid;
+ngx_pid_t     ngx_new_binary;
+ngx_int_t     ngx_inherited;
+
+sig_atomic_t  ngx_reap;
+sig_atomic_t  ngx_timer;
+sig_atomic_t  ngx_terminate;
+sig_atomic_t  ngx_quit;
+sig_atomic_t  ngx_noaccept;
+sig_atomic_t  ngx_reconfigure;
+sig_atomic_t  ngx_reopen;
+sig_atomic_t  ngx_change_binary;
+
+
+/* TODO: broken NGX_PROCESS_SINGLE */
+
+void ngx_master_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
+{
+    int                signo;
+    sigset_t           set;
+    struct timeval     tv;
+    struct itimerval   itv;
+    ngx_uint_t         i, live;
+    ngx_msec_t         delay;
+    ngx_core_conf_t   *ccf;
+
+    sigemptyset(&set);
+    sigaddset(&set, SIGCHLD);
+    sigaddset(&set, SIGALRM);
+    sigaddset(&set, SIGINT);
+    sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
+    sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
+    sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
+    sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
+    sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
+    sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
+
+    if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                      "sigprocmask() failed");
+    }
+
+    sigemptyset(&set);
+
+    ngx_setproctitle("master process");
+
+    ngx_new_binary = 0;
+    delay = 0;
+    signo = 0;
+    live = 0;
+
+    for ( ;; ) {
+        ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "new cycle");
+
+        if (ngx_process == NGX_PROCESS_MASTER) {
+            ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL,
+                              "worker process", NGX_PROCESS_RESPAWN);
+
+            /*
+             * we have to limit the maximum life time of the worker processes
+             * by 1 month because our millisecond event timer is limited
+             * by 49 days on 32-bit platforms
+             */
+
+            itv.it_interval.tv_sec = 0;
+            itv.it_interval.tv_usec = 0;
+            itv.it_value.tv_sec = 30 * 24 * 60 * 60;
+            itv.it_value.tv_usec = 0;
+
+            if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
+                ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                              "setitimer() failed");
+            }
+
+            live = 1;
+
+        } else {
+            ngx_init_temp_number();
+
+            for (i = 0; ngx_modules[i]; i++) {
+                if (ngx_modules[i]->init_process) {
+                    if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
+                        /* fatal */
+                        exit(1);
+                    }
+                }
+            }
+        }
+
+        ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
+                                               ngx_core_module);
+
+        /* a cycle with the same configuration because a new one is invalid */
+
+        for ( ;; ) {
+
+            /* an event loop */
+
+            for ( ;; ) {
+
+                if (ngx_process == NGX_PROCESS_MASTER) {
+                    if (delay) {
+                        delay *= 2;
+
+                        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                                       "temination cycle: %d", delay);
+
+                        itv.it_interval.tv_sec = 0;
+                        itv.it_interval.tv_usec = 0;
+                        itv.it_value.tv_sec = delay / 1000;
+                        itv.it_value.tv_usec = (delay % 1000 ) * 1000;
+
+                        if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
+                            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                                          "setitimer() failed");
+                        }
+                    }
+
+                    ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                                   "sigsuspend");
+
+                    sigsuspend(&set);
+
+                    ngx_gettimeofday(&tv);
+                    ngx_time_update(tv.tv_sec);
+
+                    ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                                   "wake up");
+
+                } else { /* NGX_PROCESS_SINGLE */
+                    ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                                   "worker cycle");
+
+                    ngx_process_events(cycle->log);
+                    live = 0;
+                }
+
+                if (ngx_reap) {
+                    ngx_reap = 0;
+                    ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                                   "reap childs");
+
+                    live = 0;
+                    for (i = 0; i < ngx_last_process; i++) {
+
+                        ngx_log_debug5(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                                       "child: " PID_T_FMT
+                                       " e:%d t:%d d:%d r:%d",
+                                       ngx_processes[i].pid,
+                                       ngx_processes[i].exiting,
+                                       ngx_processes[i].exited,
+                                       ngx_processes[i].detached,
+                                       ngx_processes[i].respawn);
+
+                        if (ngx_processes[i].exited) {
+
+                            if (ngx_processes[i].respawn
+                                && !ngx_processes[i].exiting
+                                && !ngx_terminate
+                                && !ngx_quit)
+                            {
+                                 if (ngx_spawn_process(cycle,
+                                                       ngx_processes[i].proc,
+                                                       ngx_processes[i].data,
+                                                       ngx_processes[i].name, i)
+                                                                  == NGX_ERROR)
+                                 {
+                                     ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
+                                                   "can not respawn %s",
+                                                   ngx_processes[i].name);
+                                     continue;
+                                 }
+
+                                 live = 1;
+
+                                 continue;
+                            }
+
+                            if (ngx_processes[i].pid == ngx_new_binary) {
+                                ngx_new_binary = 0;
+
+                                /* TODO: if (ngx_noaccept) ngx_configure = 1 */
+                            }
+
+                            if (i != --ngx_last_process) {
+                                ngx_processes[i--] =
+                                               ngx_processes[ngx_last_process];
+                            }
+
+                        } else if (ngx_processes[i].exiting
+                                   || !ngx_processes[i].detached)
+                        {
+                            live = 1;
+                        }
+                    }
+                }
+
+                if (!live && (ngx_terminate || ngx_quit)) {
+                    ngx_master_exit(cycle, ctx);
+                }
+
+                if (ngx_terminate) {
+                    if (delay == 0) {
+                        delay = 50;
+                    }
+
+                    if (delay > 1000) {
+                        signo = SIGKILL;
+                    } else {
+                        signo = ngx_signal_value(NGX_TERMINATE_SIGNAL);
+                    }
+
+                } else if (ngx_quit) {
+                    signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
+
+                } else if (ngx_timer) {
+                    signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
+
+                } else {
+
+                    if (ngx_noaccept) {
+                        signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
+                    }
+
+                    if (ngx_change_binary) {
+                        ngx_change_binary = 0;
+                        ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
+                                      "changing binary");
+                        ngx_new_binary = ngx_exec_new_binary(cycle, ctx->argv);
+                    }
+
+                    if (ngx_reconfigure) {
+                        signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
+                        ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
+                                      "reconfiguring");
+                    }
+
+                    if (ngx_reopen) {
+                        if (ngx_process == NGX_PROCESS_MASTER) {
+                            if (ccf->worker_reopen != 0) {
+                                signo = ngx_signal_value(NGX_REOPEN_SIGNAL);
+                                ngx_reopen = 0;
+
+                            } else if (ngx_noaccept) {
+                                ngx_reopen = 0;
+
+                            } else {
+                                signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
+                            }
+
+                        } else { /* NGX_PROCESS_SINGLE */
+                            ngx_reopen = 0;
+                        }
+
+                        ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
+                                      "reopening logs");
+                        ngx_reopen_files(cycle,
+                             ccf->worker_reopen != 0 ? ccf->user : (uid_t) -1);
+                    }
+                }
+
+                if (signo) {
+                    for (i = 0; i < ngx_last_process; i++) {
+
+                        if (ngx_processes[i].detached) {
+                            continue;
+                        }
+
+                        ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
+                                       "kill (" PID_T_FMT ", %d)" ,
+                                       ngx_processes[i].pid, signo);
+
+                        if (kill(ngx_processes[i].pid, signo) == -1) {
+                            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                                          "kill(%d, %d) failed",
+                                          ngx_processes[i].pid, signo);
+                            continue;
+                        }
+
+                        if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
+                            ngx_processes[i].exiting = 1;
+                        }
+                    }
+
+                    signo = 0;
+                }
+
+                if (ngx_reopen || ngx_reconfigure || ngx_timer) {
+                    break;
+                }
+            }
+
+            if (ngx_reopen) {
+                ngx_reopen = 0;
+
+            } else if (ngx_timer) {
+                ngx_timer = 0;
+
+            } else if (ngx_noaccept) {
+                ngx_noaccept = 0;
+                ngx_reconfigure = 0;
+
+            } else {
+                cycle = ngx_init_cycle(cycle);
+                if (cycle == NULL) {
+                    cycle = (ngx_cycle_t *) ngx_cycle;
+                    continue;
+                }
+
+                ngx_cycle = cycle;
+                ngx_reconfigure = 0;
+            }
+
+            break;
+        }
+    }
+}
+
+
+static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
+{
+    char  *name;
+
+    if (ngx_inherited && getppid() > 1) {
+        name = ctx->pid.name.data;
+
+    } else {
+        name = ctx->name;
+    }
+
+    if (ngx_delete_file(name) == NGX_FILE_ERROR) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                      ngx_delete_file_n " \"%s\" failed", name);
+    }
+
+    ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit");
+    exit(0);
+}
+
+
+static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
+{
+    sigset_t          set;
+    ngx_int_t         i;
+    ngx_listening_t  *ls;
+    ngx_core_conf_t  *ccf;
+#if (NGX_THREADS)
+    ngx_tid_t         tid;
+#endif
+
+    ngx_process = NGX_PROCESS_WORKER;
+    ngx_last_process = 0;
+
+    ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
+
+    if (ccf->group != (gid_t) NGX_CONF_UNSET) {
+        if (setuid(ccf->group) == -1) {
+            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
+                          "setgid(%d) failed", ccf->group);
+            /* fatal */
+            exit(2);
+        }
+    }
+
+    if (ccf->user != (uid_t) NGX_CONF_UNSET && geteuid() == 0) {
+        if (setuid(ccf->user) == -1) {
+            ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
+                          "setuid(%d) failed", ccf->user);
+            /* fatal */
+            exit(2);
+        }
+    }
+
+#if (HAVE_PR_SET_DUMPABLE)
+
+    /* allow coredump after setuid() in Linux 2.4.x */
+
+    if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                      "prctl(PR_SET_DUMPABLE) failed");
+    }
+
+#endif
+
+    sigemptyset(&set);
+
+    if (sigprocmask(SIG_SETMASK, &set, NULL) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                      "sigprocmask() failed");
+    }
+
+    ngx_init_temp_number();
+
+    /*
+     * disable deleting previous events for the listening sockets because
+     * in the worker processes there are no events at all at this point
+     */ 
+    ls = cycle->listening.elts;
+    for (i = 0; i < cycle->listening.nelts; i++) {
+        ls[i].remain = 0;
+    }
+
+    for (i = 0; ngx_modules[i]; i++) {
+        if (ngx_modules[i]->init_process) {
+            if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) {
+                /* fatal */
+                exit(1);
+            }
+        }
+    }
+
+    ngx_setproctitle("worker process");
+
+#if (NGX_THREADS)
+
+    if (ngx_init_threads(5, 128 * 1024 * 1024, cycle) == NGX_ERROR) {
+        /* fatal */
+        exit(1);
+    }
+
+    for (i = 0; i < 1; i++) {
+        if (ngx_create_thread(&tid, ngx_worker_thread_cycle,
+                              cycle, cycle->log) != 0)
+        {
+            /* fatal */
+            exit(1);
+        }
+    }
+
+#endif
+
+    for ( ;; ) {
+        ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
+
+        ngx_process_events(cycle->log);
+
+        if (ngx_terminate) {
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
+            exit(0);
+        }
+
+        if (ngx_quit) {
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
+                          "gracefully shutting down");
+            ngx_setproctitle("worker process is shutting down");
+            break;
+        }
+
+        if (ngx_reopen) {
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
+            ngx_reopen_files(cycle, -1);
+            ngx_reopen = 0;
+        }
+    }
+
+    ngx_close_listening_sockets(cycle);
+
+    for ( ;; ) {
+        if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
+            exit(0);
+        }
+
+        ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
+
+        ngx_process_events(cycle->log);
+
+        if (ngx_reopen) {
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
+            ngx_reopen_files(cycle, -1);
+            ngx_reopen = 0;
+        }
+    }
+}
+
+
+#if (NGX_THREADS)
+
+int ngx_worker_thread_cycle(void *data)
+{
+    ngx_cycle_t *cycle = data;
+
+    struct timeval  tv;
+
+    /* STUB */
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno,
+                   "thread %d started", ngx_thread_self());
+
+    ngx_setproctitle("worker thread");
+
+    sleep(5);
+
+    ngx_gettimeofday(&tv);
+    ngx_time_update(tv.tv_sec);
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno,
+                   "thread %d done", ngx_thread_self());
+
+    return 1;
+}
+
+#endif