release/src/router/mysql/storage/myisam/mi_close.c

   1 /*
   2    Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; version 2 of the License.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11    GNU General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; if not, write to the Free Software
  15    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
  16 */
  17
  18 /* close a isam-database */
  19 /*
  20   TODO:
  21    We need to have a separate mutex on the closed file to allow other threads
  22    to open other files during the time we flush the cache and close this file
  23 */
  24
  25 #include "myisamdef.h"
  26
  27 int mi_close(register MI_INFO *info)
  28 {
  29   int error=0,flag;
  30   MYISAM_SHARE *share=info->s;
  31   DBUG_ENTER("mi_close");
  32   DBUG_PRINT("enter",("base: 0x%lx  reopen: %u  locks: %u",
  33                       (long) info, (uint) share->reopen,
  34                       (uint) share->tot_locks));
  35
  36   pthread_mutex_lock(&THR_LOCK_myisam);
  37   if (info->lock_type == F_EXTRA_LCK)
  38     info->lock_type=F_UNLCK;                    /* HA_EXTRA_NO_USER_CHANGE */
  39
  40   if (info->lock_type != F_UNLCK)
  41   {
  42     if (mi_lock_database(info,F_UNLCK))
  43       error=my_errno;
  44   }
  45   pthread_mutex_lock(&share->intern_lock);
  46
  47   if (share->options & HA_OPTION_READ_ONLY_DATA)
  48   {
  49     share->r_locks--;
  50     share->tot_locks--;
  51   }
  52   if (info->opt_flag & (READ_CACHE_USED | WRITE_CACHE_USED))
  53   {
  54     if (end_io_cache(&info->rec_cache))
  55       error=my_errno;
  56     info->opt_flag&= ~(READ_CACHE_USED | WRITE_CACHE_USED);
  57   }
  58   flag= !--share->reopen;
  59   myisam_open_list=list_delete(myisam_open_list,&info->open_list);
  60   pthread_mutex_unlock(&share->intern_lock);
  61
  62   my_free(mi_get_rec_buff_ptr(info, info->rec_buff), MYF(MY_ALLOW_ZERO_PTR));
  63   if (flag)
  64   {
  65     DBUG_EXECUTE_IF("crash_before_flush_keys",
  66                     if (share->kfile >= 0) abort(););
  67     if (share->kfile >= 0 &&
  68         flush_key_blocks(share->key_cache, share->kfile,
  69                          share->temporary ? FLUSH_IGNORE_CHANGED :
  70                          FLUSH_RELEASE))
  71       error=my_errno;
  72     if (share->kfile >= 0)
  73     {
  74       /*
  75         If we are crashed, we can safely flush the current state as it will
  76         not change the crashed state.
  77         We can NOT write the state in other cases as other threads
  78         may be using the file at this point
  79       */
  80       if (share->mode != O_RDONLY && mi_is_crashed(info))
  81         mi_state_info_write(share->kfile, &share->state, 1);
  82       /* Decrement open count must be last I/O on this file. */
  83       _mi_decrement_open_count(info);
  84       if (my_close(share->kfile,MYF(0)))
  85         error = my_errno;
  86     }
  87 #ifdef HAVE_MMAP
  88     if (share->file_map)
  89     {
  90       if (share->options & HA_OPTION_COMPRESS_RECORD)
  91         _mi_unmap_file(info);
  92       else
  93         mi_munmap_file(info);
  94     }
  95 #endif
  96     if (share->decode_trees)
  97     {
  98       my_free((uchar*) share->decode_trees,MYF(0));
  99       my_free((uchar*) share->decode_tables,MYF(0));
 100     }
 101 #ifdef THREAD
 102     thr_lock_delete(&share->lock);
 103     VOID(pthread_mutex_destroy(&share->intern_lock));
 104     {
 105       int i,keys;
 106       keys = share->state.header.keys;
 107       VOID(rwlock_destroy(&share->mmap_lock));
 108       for(i=0; i<keys; i++) {
 109         VOID(rwlock_destroy(&share->key_root_lock[i]));
 110       }
 111     }
 112 #endif
 113     my_free((uchar*) info->s,MYF(0));
 114   }
 115   pthread_mutex_unlock(&THR_LOCK_myisam);
 116   if (info->ftparser_param)
 117   {
 118     my_free((uchar*)info->ftparser_param, MYF(0));
 119     info->ftparser_param= 0;
 120   }
 121   if (info->dfile >= 0 && my_close(info->dfile,MYF(0)))
 122     error = my_errno;
 123
 124   myisam_log_command(MI_LOG_CLOSE,info,NULL,0,error);
 125   my_free((uchar*) info,MYF(0));
 126
 127   if (error)
 128   {
 129     DBUG_RETURN(my_errno=error);
 130   }
 131   DBUG_RETURN(0);
 132 } /* mi_close */