implemented graceful shutdown

core/fifo.c

@@ -31,6 +31,7 @@ void uwsgi_master_fifo_prepare() {
 	uwsgi_fifo_table['L'] = uwsgi_log_rotate;
 	uwsgi_fifo_table['p'] = suspend_resume_them_all;
 	uwsgi_fifo_table['P'] = uwsgi_update_pidfiles;
+	uwsgi_fifo_table['q'] = gracefully_kill_them_all;
 	uwsgi_fifo_table['Q'] = kill_them_all;
 	uwsgi_fifo_table['r'] = grace_them_all;
 	uwsgi_fifo_table['R'] = reap_them_all;

core/uwsgi.c

@@ -1227,6 +1227,28 @@ void kill_them_all(int signum) {
 	uwsgi_destroy_processes();
 }
 
+// gracefully destroy
+void gracefully_kill_them_all(int signum) {
+
+        if (uwsgi_instance_is_dying) return;
+        uwsgi.status.gracefully_destroying = 1;
+
+        // unsubscribe if needed
+        uwsgi_unsubscribe_all();
+
+        uwsgi_log_verbose("graceful shutdown triggered...\n");
+
+        int i;
+        for (i = 1; i <= uwsgi.numproc; i++) {
+                if (uwsgi.workers[i].pid > 0) {
+                        uwsgi_curse(i, SIGHUP);
+                }
+        }
+
+        uwsgi_destroy_processes();
+}
+
+
 // graceful reload
 void grace_them_all(int signum) {
 	if (uwsgi_instance_is_reloading || uwsgi_instance_is_dying)

uwsgi.h

@@ -4326,6 +4326,7 @@ void uwsgi_reload_workers();
 void uwsgi_chain_reload();
 void uwsgi_refork_master();
 void uwsgi_update_pidfiles();
+void gracefully_kill_them_all(int);
 
 #ifdef __cplusplus
 }