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21aa586714
duration of the whole 'flush instances'. As a consequence, it was possible to query instance map, while it is in the inconsistent state. The patch was reworked after review. server-tools/instance-manager/guardian.cc: do not lock instance map in Guardian_thread::init() server-tools/instance-manager/instance_map.cc: Eliminate race condition: lock instance map and guardian for the duration of the whole "FLUSH INSTANCES" execution. server-tools/instance-manager/instance_map.h: add new method. cleanup interface. add comments. server-tools/instance-manager/manager.cc: use instance_map.flush_instances instead of instance_map.load() and guardian_thread.init()
90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
#ifndef INCLUDES_MYSQL_INSTANCE_MANAGER_INSTANCE_MAP_H
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#define INCLUDES_MYSQL_INSTANCE_MANAGER_INSTANCE_MAP_H
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/* Copyright (C) 2004 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include <my_global.h>
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#include "protocol.h"
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#include "guardian.h"
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#include <my_sys.h>
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#include <hash.h>
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#if defined(__GNUC__) && defined(USE_PRAGMA_INTERFACE)
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#pragma interface
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#endif
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class Instance;
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extern int load_all_groups(char ***groups, const char *filename);
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extern void free_groups(char **groups);
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/*
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Instance_map - stores all existing instances
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*/
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class Instance_map
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{
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public:
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/* Instance_map iterator */
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class Iterator
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{
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private:
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uint current_instance;
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Instance_map *instance_map;
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public:
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Iterator(Instance_map *instance_map_arg) :
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current_instance(0), instance_map(instance_map_arg)
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{}
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void go_to_first();
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Instance *next();
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};
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friend class Iterator;
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public:
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/* returns a pointer to the instance or NULL, if there is no such instance */
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Instance *find(const char *name, uint name_len);
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int flush_instances();
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void lock();
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void unlock();
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int init();
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/*
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Process a given option and assign it to appropricate instance. This is
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required for the option handler, passed to my_search_option_files().
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*/
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int process_one_option(const char *group, const char *option);
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Instance_map(const char *default_mysqld_path_arg);
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~Instance_map();
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public:
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const char *mysqld_path;
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Guardian_thread *guardian;
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private:
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/* loads options from config files */
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int load();
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/* inits instances argv's after all options have been loaded */
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int complete_initialization();
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private:
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enum { START_HASH_SIZE = 16 };
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pthread_mutex_t LOCK_instance_map;
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HASH hash;
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};
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#endif /* INCLUDES_MYSQL_INSTANCE_MANAGER_INSTANCE_MAP_H */
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