复制ngx_master_process_cycle(ngx_cycle_t *cycle)  {       ...      ngx_start_worker_processes(cycle,永远滴 ccf->worker_processes,                                          NGX_PROCESS_RESPAWN);      ...      for ( ;; ) {           if (delay) { ...}          ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");          sigsuspend(&set);          ngx_time_update();          ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,                               "wake up, sigio %i", sigio);          if (ngx_reap) {               ngx_reap = 0;              ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");              live = ngx_reap_children(cycle);          }          if (!live && (ngx_terminate || ngx_quit)) { ...}          if (ngx_terminate) { ...}          if (ngx_quit) { ...}          if (ngx_reconfigure) { ...}          if (ngx_restart) { ...}          if (ngx_reopen) { ...}          if (ngx_change_binary) { ...}          if (ngx_noaccept) {               ngx_noaccept = 0;              ngx_noaccepting = 1;              ngx_signal_worker_processes(cycle,                                                    ngx_signal_value(NGX_SHUTDOWN_SIGNAL));          }      }   }  1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.29.30.31.32.33.34.35.36.37.38.39.40.41.42.43.44.45.46.47.48.