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 MYSQL_SERVICE_PROGRESS_REPORT_INCLUDED
/* Copyright (C) 2011 Monty Program 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; 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 Street, Fifth Floor, Boston, MA 02110-1335 USA */

/**
  @file
  This service allows plugins to report progress of long running operations
  to the server. The progress report is visible in SHOW PROCESSLIST,
  INFORMATION_SCHEMA.PROCESSLIST, and is sent to the client
  if requested.

  The functions are documented at
  https://mariadb.com/kb/en/progress-reporting/#how-to-add-support-for-progress-reporting-to-a-storage-engine
*/

#ifdef __cplusplus
extern "C" {
#endif

#define thd_proc_info(thd, msg)  set_thd_proc_info(thd, msg, \
                                                   __func__, __FILE__, __LINE__)

extern struct progress_report_service_st {
  void (*thd_progress_init_func)(MYSQL_THD thd, unsigned int max_stage);
  void (*thd_progress_report_func)(MYSQL_THD thd,
                                   unsigned long long progress,
                                   unsigned long long max_progress);
  void (*thd_progress_next_stage_func)(MYSQL_THD thd);
  void (*thd_progress_end_func)(MYSQL_THD thd);
  const char *(*set_thd_proc_info_func)(MYSQL_THD, const char *info,
                                        const char *func,
                                        const char *file,
                                        unsigned int line);
} *progress_report_service;

#ifdef MYSQL_DYNAMIC_PLUGIN

#define thd_progress_init(thd,max_stage) (progress_report_service->thd_progress_init_func((thd),(max_stage)))
#define thd_progress_report(thd, progress, max_progress) (progress_report_service->thd_progress_report_func((thd), (progress), (max_progress)))
#define thd_progress_next_stage(thd) (progress_report_service->thd_progress_next_stage_func(thd))
#define thd_progress_end(thd) (progress_report_service->thd_progress_end_func(thd))
#define set_thd_proc_info(thd,info,func,file,line) (progress_report_service->set_thd_proc_info_func((thd),(info),(func),(file),(line)))

#else

/**
   Report progress for long running operations 

   @param thd            User thread connection handle
   @param progress       Where we are now
   @param max_progress   Progress will continue up to this
*/
void thd_progress_init(MYSQL_THD thd, unsigned int max_stage);
void thd_progress_report(MYSQL_THD thd,
                         unsigned long long progress,
                         unsigned long long max_progress);
void thd_progress_next_stage(MYSQL_THD thd);
void thd_progress_end(MYSQL_THD thd);
const char *set_thd_proc_info(MYSQL_THD, const char * info, const char *func,
                              const char *file, unsigned int line);

#endif

#ifdef __cplusplus
}
#endif

#define MYSQL_SERVICE_PROGRESS_REPORT_INCLUDED
#endif