1 files changed, 86 insertions, 0 deletions
diff --git a/server-tools/instance-manager/guardian.h b/server-tools/instance-manager/guardian.h
new file mode 100644
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+++ b/server-tools/instance-manager/guardian.h
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+#ifndef INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H
+#define INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H
+/* Copyright (C) 2004 MySQL 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 */
+
+#include <my_global.h>
+#include <my_sys.h>
+#include <my_list.h>
+
+#ifdef __GNUC__
+#pragma interface
+#endif
+
+class Instance_map;
+
+#include "thread_registry.h"
+#include "instance.h"
+
+C_MODE_START
+
+pthread_handler_decl(guardian, arg);
+
+C_MODE_END
+
+
+struct Guardian_thread_args
+{
+  Thread_registry &thread_registry;
+  Instance_map *instance_map;
+  uint monitoring_interval;
+
+  Guardian_thread_args(Thread_registry &thread_registry_arg,
+                       Instance_map *instance_map_arg,
+                       uint monitoring_interval_arg) :
+    thread_registry(thread_registry_arg),
+    instance_map(instance_map_arg),
+    monitoring_interval(monitoring_interval_arg)
+  {}
+};
+
+
+/*
+  The guardian thread is responsible for monitoring and restarting of guarded
+  instances.
+*/
+
+class Guardian_thread: public Guardian_thread_args
+{
+public:
+  Guardian_thread(Thread_registry &thread_registry_arg,
+                  Instance_map *instance_map_arg,
+                  uint monitoring_interval_arg);
+  ~Guardian_thread();
+  void run();
+  int init();
+  int start();
+  int guard(Instance *instance);
+  int stop_guard(Instance *instance);
+
+private:
+  int add_instance_to_list(Instance *instance, LIST **list);
+  void move_to_list(LIST **from, LIST **to);
+
+private:
+  pthread_mutex_t LOCK_guardian;
+  Thread_info thread_info;
+  LIST *guarded_instances;
+  LIST *starting_instances;
+  MEM_ROOT alloc;
+  enum { MEM_ROOT_BLOCK_SIZE= 512 };
+};
+
+#endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_GUARDIAN_H */