openresty/patches/nginx-1.11.2-single_process_graceful_exit.patch

--- nginx-1.11.2/src/os/unix/ngx_process_cycle.c	2016-07-05 08:56:16.000000000 -0700
+++ nginx-1.11.2-patched/src/os/unix/ngx_process_cycle.c	2017-05-14 09:59:52.301108274 -0700
@@ -304,11 +304,29 @@ ngx_single_process_cycle(ngx_cycle_t *cy
     }
 
     for ( ;; ) {
+        if (ngx_exiting) {
+            ngx_event_cancel_timers();
+
+            if (ngx_event_timer_rbtree.root == ngx_event_timer_rbtree.sentinel)
+            {
+                ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
+
+                for (i = 0; cycle->modules[i]; i++) {
+                    if (cycle->modules[i]->exit_process) {
+                        cycle->modules[i]->exit_process(cycle);
+                    }
+                }
+
+                ngx_master_process_exit(cycle);
+            }
+        }
+
         ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
 
         ngx_process_events_and_timers(cycle);
 
-        if (ngx_terminate || ngx_quit) {
+        if (ngx_terminate) {
+            ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
 
             for (i = 0; cycle->modules[i]; i++) {
                 if (cycle->modules[i]->exit_process) {
@@ -319,6 +337,19 @@ ngx_single_process_cycle(ngx_cycle_t *cy
             ngx_master_process_exit(cycle);
         }
 
+        if (ngx_quit) {
+            ngx_quit = 0;
+            ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
+                          "gracefully shutting down");
+            ngx_setproctitle("process is shutting down");
+
+            if (!ngx_exiting) {
+                ngx_exiting = 1;
+                ngx_close_listening_sockets(cycle);
+                ngx_close_idle_connections(cycle);
+            }
+        }
+
         if (ngx_reconfigure) {
             ngx_reconfigure = 0;
             ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");