晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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#ifndef REPL_FAILSAFE_INCLUDED
#define REPL_FAILSAFE_INCLUDED

/* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.

   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; version 2 of the License.

   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */

#ifdef HAVE_REPLICATION

#include "mysql.h"
#include <my_sys.h>
#include "slave.h"

extern Atomic_counter<uint32_t> binlog_dump_thread_count;
typedef enum {RPL_AUTH_MASTER=0,RPL_IDLE_SLAVE,RPL_ACTIVE_SLAVE,
	      RPL_LOST_SOLDIER,RPL_TROOP_SOLDIER,
	      RPL_RECOVERY_CAPTAIN,RPL_NULL /* inactive */,
	      RPL_ANY /* wild card used by change_rpl_status */ } RPL_STATUS;
extern ulong rpl_status;

extern mysql_mutex_t LOCK_rpl_status;
extern mysql_cond_t COND_rpl_status;
extern TYPELIB rpl_role_typelib;
extern const char* rpl_role_type[], *rpl_status_type[];

void change_rpl_status(ulong from_status, ulong to_status);
int find_recovery_captain(THD* thd, MYSQL* mysql);

bool show_slave_hosts(THD* thd);

#endif /* HAVE_REPLICATION */
#endif /* REPL_FAILSAFE_INCLUDED */