new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_process_cycle.c
@@ -0,0 +1,970 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+#include <ngx_channel.h>
+
+
+static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
+                                       ngx_int_t type);
+static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo);
+static ngx_uint_t ngx_reap_childs(ngx_cycle_t *cycle);
+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);
+static void ngx_channel_handler(ngx_event_t *ev);
+#if (NGX_THREADS)
+static void ngx_wakeup_worker_threads(ngx_cycle_t *cycle);
+static void *ngx_worker_thread_cycle(void *data);
+#endif
+
+
+ngx_uint_t    ngx_process;
+ngx_pid_t     ngx_pid;
+ngx_uint_t    ngx_threaded;
+
+sig_atomic_t  ngx_reap;
+sig_atomic_t  ngx_timer;
+sig_atomic_t  ngx_sigio;
+sig_atomic_t  ngx_terminate;
+sig_atomic_t  ngx_quit;
+ngx_uint_t    ngx_exiting;
+sig_atomic_t  ngx_reconfigure;
+sig_atomic_t  ngx_reopen;
+
+sig_atomic_t  ngx_change_binary;
+ngx_pid_t     ngx_new_binary;
+ngx_uint_t    ngx_inherited;
+ngx_uint_t    ngx_daemonized;
+
+sig_atomic_t  ngx_noaccept;
+ngx_uint_t    ngx_noaccepting;
+ngx_uint_t    ngx_restart;
+
+
+#if (NGX_THREADS)
+volatile ngx_thread_t  ngx_threads[NGX_MAX_THREADS];
+ngx_int_t              ngx_threads_n;
+#endif
+
+
+u_char  master_process[] = "master process";
+
+
+void ngx_master_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
+{
+    char              *title;
+    u_char            *p;
+    size_t             size;
+    ngx_int_t          i;
+    sigset_t           set;
+    struct timeval     tv;
+    struct itimerval   itv;
+    ngx_uint_t         live;
+    ngx_msec_t         delay;
+    ngx_core_conf_t   *ccf;
+
+    sigemptyset(&set);
+    sigaddset(&set, SIGCHLD);
+    sigaddset(&set, SIGALRM);
+    sigaddset(&set, SIGIO);
+    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);
+
+
+    size = sizeof(master_process);
+
+    for (i = 0; i < ctx->argc; i++) {
+        size += ngx_strlen(ctx->argv[i]) + 1;
+    }
+
+    title = ngx_palloc(cycle->pool, size);
+
+    p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
+    for (i = 0; i < ctx->argc; i++) {
+        *p++ = ' ';
+        p = ngx_cpystrn(p, (u_char *) ctx->argv[i], size);
+    }
+
+    ngx_setproctitle(title);
+
+
+    ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
+
+    ngx_start_worker_processes(cycle, ccf->worker_processes,
+                               NGX_PROCESS_RESPAWN);
+
+    ngx_new_binary = 0;
+    delay = 0;
+    live = 1;
+
+    for ( ;; ) {
+        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");
+
+        if (ngx_reap) {
+            ngx_reap = 0;
+            ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap childs");
+
+            live = ngx_reap_childs(cycle);
+        }
+
+        if (!live && (ngx_terminate || ngx_quit)) {
+            ngx_master_exit(cycle, ctx);
+        }
+
+        if (ngx_terminate) {
+            if (delay == 0) {
+                delay = 50;
+            }
+
+            if (delay > 1000) {
+                ngx_signal_worker_processes(cycle, SIGKILL);
+            } else {
+                ngx_signal_worker_processes(cycle,
+                                       ngx_signal_value(NGX_TERMINATE_SIGNAL));
+            }
+
+            continue;
+        }
+
+        if (ngx_quit) {
+            ngx_signal_worker_processes(cycle,
+                                        ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
+            continue;
+        }
+
+        if (ngx_timer) {
+            ngx_timer = 0;
+            ngx_start_worker_processes(cycle, ccf->worker_processes,
+                                       NGX_PROCESS_JUST_RESPAWN);
+            live = 1;
+            ngx_signal_worker_processes(cycle,
+                                        ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
+        }
+
+        if (ngx_reconfigure) {
+            ngx_reconfigure = 0;
+
+            if (ngx_new_binary) {
+                ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start new workers");
+
+                ngx_start_worker_processes(cycle, ccf->worker_processes,
+                                           NGX_PROCESS_RESPAWN);
+                ngx_noaccepting = 0;
+
+                continue;
+            }
+
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring");
+
+            cycle = ngx_init_cycle(cycle);
+            if (cycle == NULL) {
+                cycle = (ngx_cycle_t *) ngx_cycle;
+                continue;
+            }
+
+            ngx_cycle = cycle;
+            ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
+                                                   ngx_core_module);
+            ngx_start_worker_processes(cycle, ccf->worker_processes,
+                                       NGX_PROCESS_JUST_RESPAWN);
+            live = 1;
+            ngx_signal_worker_processes(cycle,
+                                        ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
+        }
+
+        if (ngx_restart) {
+            ngx_restart = 0;
+            ngx_start_worker_processes(cycle, ccf->worker_processes,
+                                       NGX_PROCESS_RESPAWN);
+            live = 1;
+        }
+
+        if (ngx_reopen) {
+            ngx_reopen = 0;
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs");
+            ngx_reopen_files(cycle, ccf->user);
+            ngx_signal_worker_processes(cycle,
+                                        ngx_signal_value(NGX_REOPEN_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_noaccept) {
+            ngx_noaccept = 0;
+            ngx_noaccepting = 1;
+            ngx_signal_worker_processes(cycle,
+                                        ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
+        }
+    }
+}
+
+
+void ngx_single_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
+{
+    ngx_uint_t  i;
+
+#if 0
+    ngx_setproctitle("single worker process");
+#endif
+
+    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(2);
+            }
+        }
+    }
+
+    for ( ;; ) {
+        ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
+
+        ngx_process_events(cycle);
+
+        if (ngx_terminate || ngx_quit) {
+            ngx_master_exit(cycle, ctx);
+        }
+
+        if (ngx_reconfigure) {
+            ngx_reconfigure = 0;
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring");
+
+            cycle = ngx_init_cycle(cycle);
+            if (cycle == NULL) {
+                cycle = (ngx_cycle_t *) ngx_cycle;
+                continue;
+            }
+
+            ngx_cycle = cycle;
+        }
+
+        if (ngx_reopen) {
+            ngx_reopen = 0;
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs");
+            ngx_reopen_files(cycle, (ngx_uid_t) -1);
+        }
+    }
+}
+
+
+static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
+                                       ngx_int_t type)
+{
+    ngx_int_t         i;
+    ngx_channel_t     ch;
+    struct itimerval  itv;
+
+    ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start worker processes");
+
+    ch.command = NGX_CMD_OPEN_CHANNEL;
+
+    while (n--) {
+        ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL,
+                          "worker process", type);
+
+        ch.pid = ngx_processes[ngx_process_slot].pid;
+        ch.slot = ngx_process_slot;
+        ch.fd = ngx_processes[ngx_process_slot].channel[0];
+
+        for (i = 0; i < ngx_last_process; i++) {
+
+            if (i == ngx_process_slot
+                || ngx_processes[i].pid == -1
+                || ngx_processes[i].channel[0] == -1)
+            {
+                continue;
+            }
+
+            ngx_log_debug6(NGX_LOG_DEBUG_CORE, cycle->log, 0,
+                           "pass channel s:%d pid:" PID_T_FMT
+                           " fd:%d to s:%d pid:" PID_T_FMT " fd:%d",
+                           ch.slot, ch.pid, ch.fd,
+                           i, ngx_processes[i].pid,
+                           ngx_processes[i].channel[0]);
+
+            /* TODO: NGX_AGAIN */
+
+            ngx_write_channel(ngx_processes[i].channel[0],
+                              &ch, sizeof(ngx_channel_t), cycle->log);
+        }
+    }
+
+    /*
+     * we have to limit the maximum life time of the worker processes
+     * by 10 days because our millisecond event timer is limited
+     * by 24 days on 32-bit platforms
+     */
+
+    itv.it_interval.tv_sec = 0;
+    itv.it_interval.tv_usec = 0;
+    itv.it_value.tv_sec = 10 * 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");
+    }
+}
+
+
+static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo)
+{
+    ngx_int_t      i;
+    ngx_err_t      err;
+    ngx_channel_t  ch;
+
+
+    switch (signo) {
+
+    case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
+        ch.command = NGX_CMD_QUIT;
+        break;
+
+    case ngx_signal_value(NGX_TERMINATE_SIGNAL):
+        ch.command = NGX_CMD_TERMINATE;
+        break;
+
+    case ngx_signal_value(NGX_REOPEN_SIGNAL):
+        ch.command = NGX_CMD_REOPEN;
+        break;
+
+    default:
+        ch.command = 0;
+    }
+
+    ch.fd = -1;
+
+
+    for (i = 0; i < ngx_last_process; i++) {
+
+        ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                       "child: %d " PID_T_FMT " e:%d t:%d d:%d r:%d j:%d",
+                       i,
+                       ngx_processes[i].pid,
+                       ngx_processes[i].exiting,
+                       ngx_processes[i].exited,
+                       ngx_processes[i].detached,
+                       ngx_processes[i].respawn,
+                       ngx_processes[i].just_respawn);
+
+        if (ngx_processes[i].detached || ngx_processes[i].pid == -1) {
+            continue;
+        }
+
+        if (ngx_processes[i].just_respawn) {
+            ngx_processes[i].just_respawn = 0;
+            continue;
+        }
+
+        if (ngx_processes[i].exiting
+            && signo == ngx_signal_value(NGX_SHUTDOWN_SIGNAL))
+        {
+            continue;
+        }
+
+        if (ch.command) {
+            if (ngx_write_channel(ngx_processes[i].channel[0],
+                           &ch, sizeof(ngx_channel_t), cycle->log) == NGX_OK)
+            {
+                if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
+                    ngx_processes[i].exiting = 1;
+                }
+
+                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) {
+            err = ngx_errno;
+            ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
+                          "kill(%d, %d) failed",
+                          ngx_processes[i].pid, signo);
+
+            if (err == NGX_ESRCH) {
+                ngx_processes[i].exited = 1;
+                ngx_processes[i].exiting = 0;
+                ngx_reap = 1;
+            }
+
+            continue;
+        }
+
+        if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
+            ngx_processes[i].exiting = 1;
+        }
+    }
+}
+
+
+static ngx_uint_t ngx_reap_childs(ngx_cycle_t *cycle)
+{
+    ngx_int_t      i, n;
+    ngx_uint_t     live;
+    ngx_channel_t  ch;
+
+    ch.command = NGX_CMD_CLOSE_CHANNEL;
+    ch.fd = -1;
+
+    live = 0;
+    for (i = 0; i < ngx_last_process; i++) {
+
+        ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                       "child: %d " PID_T_FMT " e:%d t:%d d:%d r:%d j:%d",
+                       i,
+                       ngx_processes[i].pid,
+                       ngx_processes[i].exiting,
+                       ngx_processes[i].exited,
+                       ngx_processes[i].detached,
+                       ngx_processes[i].respawn,
+                       ngx_processes[i].just_respawn);
+
+        if (ngx_processes[i].pid == -1) {
+            continue;
+        }
+
+        if (ngx_processes[i].exited) {
+
+            if (!ngx_processes[i].detached) {
+                ngx_close_channel(ngx_processes[i].channel, cycle->log);
+
+                ngx_processes[i].channel[0] = -1;
+                ngx_processes[i].channel[1] = -1;
+
+                ch.pid = ngx_processes[i].pid;
+                ch.slot = i;
+
+                for (n = 0; n < ngx_last_process; n++) {
+                    if (ngx_processes[n].exited
+                        || ngx_processes[n].pid == -1
+                        || ngx_processes[n].channel[0] == -1)
+                    {
+                        continue;
+                    }
+
+                    ngx_log_debug3(NGX_LOG_DEBUG_CORE, cycle->log, 0,
+                       "pass close channel s:%d pid:" PID_T_FMT
+                       " to:" PID_T_FMT, ch.slot, ch.pid, ngx_processes[n].pid);
+
+                    /* TODO: NGX_AGAIN */
+
+                    ngx_write_channel(ngx_processes[n].channel[0],
+                                      &ch, sizeof(ngx_channel_t), cycle->log);
+                }
+            }
+
+            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;
+                if (ngx_noaccepting) {
+                    ngx_restart = 1;
+                    ngx_noaccepting = 0;
+                }
+            }
+
+            if (i == ngx_last_process - 1) {
+                ngx_last_process--;
+
+            } else {
+                ngx_processes[i].pid = -1;
+            }
+
+        } else if (ngx_processes[i].exiting || !ngx_processes[i].detached) {
+            live = 1;
+        }
+    }
+
+    return live;
+}
+
+
+static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx)
+{
+    ngx_delete_pidfile(cycle);
+
+    ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit");
+
+    ngx_destroy_pool(cycle->pool);
+
+    exit(0);
+}
+
+
+static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
+{
+    sigset_t           set;
+    ngx_err_t          err;
+    ngx_int_t          n;
+    ngx_uint_t         i;
+    struct timeval     tv;
+    ngx_listening_t   *ls;
+    ngx_core_conf_t   *ccf;
+    ngx_connection_t  *c;
+
+
+    ngx_gettimeofday(&tv);
+
+    ngx_start_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000 + tv.tv_usec / 1000;
+    ngx_old_elapsed_msec = 0;
+    ngx_elapsed_msec = 0;
+
+
+    ngx_process = NGX_PROCESS_WORKER;
+
+    ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
+
+    if (ccf->group != (gid_t) NGX_CONF_UNSET) {
+        if (setgid(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) {
+        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(2);
+            }
+        }
+    }
+
+    for (n = 0; n < ngx_last_process; n++) {
+
+        if (ngx_processes[n].pid == -1) {
+            continue;
+        }
+
+        if (n == ngx_process_slot) {
+            continue;
+        }
+
+        if (ngx_processes[n].channel[1] == -1) {
+            continue;
+        }
+
+        if (close(ngx_processes[n].channel[1]) == -1) {
+            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                          "close() failed");
+        }
+    }
+
+    if (close(ngx_processes[ngx_process_slot].channel[0]) == -1) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                      "close() failed");
+    }
+
+#if 0
+    ngx_last_process = 0;
+#endif
+
+    if (ngx_add_channel_event(cycle, ngx_channel, NGX_READ_EVENT,
+                                             ngx_channel_handler) == NGX_ERROR)
+    {
+        /* fatal */
+        exit(2);
+    }
+
+    ngx_setproctitle("worker process");
+
+#if (NGX_THREADS)
+
+    if (ngx_time_mutex_init(cycle->log) == NGX_ERROR) {
+        /* fatal */
+        exit(2);
+    }
+
+    if (ngx_threads_n) {
+        if (ngx_init_threads(ngx_threads_n,
+                                   ccf->thread_stack_size, cycle) == NGX_ERROR)
+        {
+            /* fatal */
+            exit(2);
+        }
+
+        err = ngx_thread_key_create(&ngx_core_tls_key);
+        if (err != 0) {
+            ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
+                          ngx_thread_key_create_n " failed");
+            /* fatal */
+            exit(2);
+        }
+
+        for (n = 0; n < ngx_threads_n; n++) {
+
+            if (!(ngx_threads[n].cv = ngx_cond_init(cycle->log))) {
+                /* fatal */
+                exit(2);
+            }
+
+            if (ngx_create_thread((ngx_tid_t *) &ngx_threads[n].tid,
+                                  ngx_worker_thread_cycle,
+                                  (void *) &ngx_threads[n], cycle->log) != 0)
+            {
+                /* fatal */
+                exit(2);
+            }
+        }
+    }
+
+#endif
+
+    for ( ;; ) {
+        if (ngx_exiting
+            && ngx_event_timer_rbtree == &ngx_event_timer_sentinel)
+        {
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
+
+
+#if (NGX_THREADS)
+            ngx_terminate = 1;
+
+            ngx_wakeup_worker_threads(cycle);
+#endif
+
+            /*
+             * we do not destroy cycle->pool here because a signal handler
+             * that uses cycle->log can be called at this point
+             */
+            exit(0);
+        }
+
+        ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
+
+        ngx_process_events(cycle);
+
+        if (ngx_terminate) {
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
+
+#if (NGX_THREADS)
+            ngx_wakeup_worker_threads(cycle);
+#endif
+
+            /*
+             * we do not destroy cycle->pool here because a signal handler
+             * that uses cycle->log can be called at this point
+             */
+            exit(0);
+        }
+
+        if (ngx_quit) {
+            ngx_quit = 0;
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
+                          "gracefully shutting down");
+            ngx_setproctitle("worker process is shutting down");
+
+            if (!ngx_exiting) {
+                ngx_close_listening_sockets(cycle);
+                ngx_exiting = 1;
+            }
+        }
+
+        if (ngx_reopen) {
+            ngx_reopen = 0;
+            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
+            ngx_reopen_files(cycle, -1);
+        }
+    }
+}
+
+
+static void ngx_channel_handler(ngx_event_t *ev)
+{
+    ngx_int_t          n;
+    ngx_channel_t      ch;
+    ngx_connection_t  *c;
+
+    c = ev->data;
+
+    ngx_log_debug0(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel handler");
+
+    n = ngx_read_channel(c->fd, &ch, sizeof(ngx_channel_t), ev->log);
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel: %d", n);
+
+    if (n <= 0) {
+        return;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,
+                   "channel command: %d", ch.command);
+
+    switch (ch.command) {
+
+    case NGX_CMD_QUIT:
+        ngx_quit = 1;
+        break;
+
+    case NGX_CMD_TERMINATE:
+        ngx_terminate = 1;
+        break;
+
+    case NGX_CMD_REOPEN:
+        ngx_reopen = 1;
+        break;
+
+    case NGX_CMD_OPEN_CHANNEL:
+
+        ngx_log_debug3(NGX_LOG_DEBUG_CORE, ev->log, 0,
+                       "get channel s:%d pid:" PID_T_FMT " fd:%d",
+                       ch.slot, ch.pid, ch.fd);
+
+        ngx_processes[ch.slot].pid = ch.pid;
+        ngx_processes[ch.slot].channel[0] = ch.fd;
+        break;
+
+    case NGX_CMD_CLOSE_CHANNEL:
+
+        ngx_log_debug4(NGX_LOG_DEBUG_CORE, ev->log, 0,
+                       "close channel s:%d pid:" PID_T_FMT " our:" PID_T_FMT
+                       " fd:%d",
+                       ch.slot, ch.pid, ngx_processes[ch.slot].pid,
+                       ngx_processes[ch.slot].channel[0]);
+
+        if (close(ngx_processes[ch.slot].channel[0]) == -1) {
+            ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno, "close() failed");
+        }
+
+        ngx_processes[ch.slot].channel[0] = -1;
+        break;
+    }
+}
+
+
+#if (NGX_THREADS)
+
+static void ngx_wakeup_worker_threads(ngx_cycle_t *cycle)
+{
+    ngx_int_t   i;
+    ngx_uint_t  live;
+
+    for ( ;; ) {
+
+        live = 0;
+
+        for (i = 0; i < ngx_threads_n; i++) {
+            if (ngx_threads[i].state < NGX_THREAD_EXIT) {
+                ngx_cond_signal(ngx_threads[i].cv);
+
+                if (ngx_threads[i].cv->tid == (ngx_tid_t) -1) {
+                    ngx_threads[i].state = NGX_THREAD_DONE;
+                } else {
+                    live = 1;
+                }
+            }
+
+            if (ngx_threads[i].state == NGX_THREAD_EXIT) {
+                ngx_thread_join(ngx_threads[i].tid, NULL);
+                ngx_threads[i].state = NGX_THREAD_DONE;
+            }
+        }
+
+        if (live == 0) {
+            ngx_log_debug0(NGX_LOG_DEBUG_CORE, cycle->log, 0,
+                           "all worker threads are joined");
+
+            /* STUB */
+            ngx_done_events(cycle);
+            ngx_mutex_destroy(ngx_event_timer_mutex);
+            ngx_mutex_destroy(ngx_posted_events_mutex);
+
+            return;
+        }
+
+        ngx_sched_yield();
+    }
+}
+
+
+static void* ngx_worker_thread_cycle(void *data)
+{
+    ngx_thread_t  *thr = data;
+
+    sigset_t          set;
+    ngx_err_t         err;
+    ngx_core_tls_t   *tls;
+    ngx_cycle_t      *cycle;
+    struct timeval    tv;
+
+    thr->cv->tid = ngx_thread_self();
+
+    cycle = (ngx_cycle_t *) ngx_cycle;
+
+    sigemptyset(&set);
+    sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
+    sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
+    sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));
+
+    err = ngx_thread_sigmask(SIG_BLOCK, &set, NULL);
+    if (err) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
+                      ngx_thread_sigmask_n " failed");
+        return (void *) 1;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cycle->log, 0,
+                   "thread " TID_T_FMT " started", ngx_thread_self());
+
+    ngx_setthrtitle("worker thread");
+
+    if (!(tls = ngx_calloc(sizeof(ngx_core_tls_t), cycle->log))) {
+        return (void *) 1;
+    }
+
+    err = ngx_thread_set_tls(ngx_core_tls_key, tls);
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
+                      ngx_thread_set_tls_n " failed");
+        return (void *) 1;
+    }
+
+    if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
+        return (void *) 1;
+    }
+
+    for ( ;; ) {
+        thr->state = NGX_THREAD_FREE;
+
+        if (ngx_cond_wait(thr->cv, ngx_posted_events_mutex) == NGX_ERROR) {
+            return (void *) 1;
+        }
+
+        if (ngx_terminate) {
+            thr->state = NGX_THREAD_EXIT;
+
+            ngx_mutex_unlock(ngx_posted_events_mutex);
+
+            ngx_log_debug1(NGX_LOG_DEBUG_CORE, cycle->log, 0,
+                           "thread %d is done", ngx_thread_self());
+
+            return (void *) 0;
+        }
+
+        thr->state = NGX_THREAD_BUSY;
+
+        if (ngx_event_thread_process_posted(cycle) == NGX_ERROR) {
+            return (void *) 1;
+        }
+
+        if (ngx_event_thread_process_posted(cycle) == NGX_ERROR) {
+            return (void *) 1;
+        }
+
+        if (ngx_process_changes) {
+            if (ngx_process_changes(cycle, 1) == NGX_ERROR) {
+                return (void *) 1;
+            }
+        }
+    }
+}
+
+#endif