First implementation for signal handling and multi-threading:

safe shutdown and signal deliverence to all threads in 
the manager process

server-tools/instance-manager/listener.h

@@ -0,0 +1,45 @@
+#ifndef INCLUDES_MYSQL_INSTANCE_MANAGER_LISTENER_H
+#define INCLUDES_MYSQL_INSTANCE_MANAGER_LISTENER_H
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#ifdef __GNUC__
+#pragma interface
+#endif
+
+#include <my_global.h>
+#include <my_pthread.h>
+
+C_MODE_START
+
+pthread_handler_decl(listener, arg);
+
+C_MODE_END
+
+class Thread_repository;
+
+struct Listener_thread_args
+{
+  Thread_repository &thread_repository;
+  const char *socket_file_name;
+
+  Listener_thread_args(Thread_repository &thread_repository_arg,
+                       const char *socket_file_name_arg) :
+    thread_repository(thread_repository_arg),
+    socket_file_name(socket_file_name_arg) {}
+};
+
+#endif