mirror of
https://github.com/MariaDB/server.git
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9e72e1ef53
Fixes for embedded server Made key_cache more configurable Fixed that one can change key blocksize in MyISAM A lot of optimizations to make MyISAM slightly faster Docs/manual.texi: Cleaned up SSL documentation client/mysql.cc: Fixes for embedded server client/mysqltest.c: Fixes for embedded server Removed memory and file leaks include/my_global.h: Added C_MODE_START / C_MODE_END macros include/my_sys.h: Made key_cache more configurable include/myisam.h: Fixed that one can change MyISAM key block size include/mysql.h: Fixes for embedded server libmysql/libmysql.c: Cleanup libmysqld/Makefile.am: Cleanup libmysqld/examples/test-run: Added --debug libmysqld/lib_sql.cc: Cleanup libmysqld/libmysqld.c: Cleanup myisam/ft_boolean_search.c: Optimized mi_key_cmp to be faster myisam/ft_nlq_search.c: Optimized mi_key_cmp to be faster myisam/ft_search.c: Optimized mi_key_cmp to be faster myisam/mi_changed.c: Optimized mi_key_cmp to be faster myisam/mi_check.c: Optimized mi_key_cmp to be faster myisam/mi_create.c: Fixed that one can change blocksize by changing myisam_block_size myisam/mi_delete.c: Optimized mi_key_cmp to be faster myisam/mi_delete_all.c: Optimized mi_key_cmp to be faster myisam/mi_dynrec.c: Speed optimizations myisam/mi_info.c: Speed optimizations myisam/mi_key.c: Speed optimizations myisam/mi_locking.c: Speed optimizations myisam/mi_open.c: Fixed that one can change blocksize by changing myisam_block_size myisam/mi_page.c: Fixed that one can change blocksize by changing myisam_block_size myisam/mi_range.c: Speed optimizations myisam/mi_rkey.c: Speed optimizations myisam/mi_rnext.c: Speed optimizations myisam/mi_rnext_same.c: Speed optimizations myisam/mi_rprev.c: Speed optimizations myisam/mi_rsame.c: Speed optimizations myisam/mi_search.c: Speed optimizations myisam/mi_static.c: Fixed that one can change blocksize by changing myisam_block_size myisam/mi_statrec.c: Speed optimizations myisam/mi_test2.c: Added more test options myisam/mi_test_all.res: Added more test options myisam/mi_test_all.sh: Added more test options myisam/mi_write.c: Speed optimizations myisam/myisamchk.c: Added options to change block size and repair checksums myisam/myisamdef.h: Speed optimizations mysys/Makefile.am: Added bit handling functions mysys/mf_keycache.c: Made key_cache more configurable mysys/my_init.c: made my_init_done global scripts/mysql_fix_privilege_tables.sh: Fixes for SSL scripts/mysql_install_db.sh: Fixes for SSL sql/derror.cc: Don't call exit, call unireg_abort() sql/item_cmpfunc.cc: Speed optimizations sql/item_cmpfunc.h: Speed optimizations sql/mysql_priv.h: Fixes for embedded server sql/mysqld.cc: Fixes for embedded server
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 "myisamdef.h"
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/*
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Read previous row with the same key as previous read
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One may have done a write, update or delete of the previous row.
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NOTE! Even if one changes the previous row, the next read is done
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based on the position of the last used key!
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*/
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int mi_rprev(MI_INFO *info, byte *buf, int inx)
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{
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int error,changed;
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register uint flag;
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MYISAM_SHARE *share=info->s;
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DBUG_ENTER("mi_rprev");
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if ((inx = _mi_check_index(info,inx)) < 0)
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DBUG_RETURN(my_errno);
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flag=SEARCH_SMALLER; /* Read previous */
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if (info->lastpos == HA_OFFSET_ERROR && info->update & HA_STATE_NEXT_FOUND)
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flag=0; /* Read last */
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if (fast_mi_readinfo(info))
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DBUG_RETURN(my_errno);
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changed=_mi_test_if_changed(info);
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if (share->concurrent_insert)
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rw_rdlock(&share->key_root_lock[inx]);
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if (!flag)
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error=_mi_search_last(info, share->keyinfo+inx,
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share->state.key_root[inx]);
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else if (!changed)
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error=_mi_search_next(info,share->keyinfo+inx,info->lastkey,
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info->lastkey_length,flag,
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share->state.key_root[inx]);
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else
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error=_mi_search(info,share->keyinfo+inx,info->lastkey,
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USE_WHOLE_KEY, flag, share->state.key_root[inx]);
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if (!error)
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{
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while (info->lastpos >= info->state->data_file_length)
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{
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/* Skip rows that are inserted by other threads since we got a lock */
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if ((error=_mi_search_next(info,share->keyinfo+inx,info->lastkey,
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info->lastkey_length,
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SEARCH_SMALLER,
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share->state.key_root[inx])))
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break;
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}
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}
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if (share->concurrent_insert)
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rw_unlock(&share->key_root_lock[inx]);
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info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
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info->update|= HA_STATE_PREV_FOUND;
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if (error)
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{
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if (my_errno == HA_ERR_KEY_NOT_FOUND)
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my_errno=HA_ERR_END_OF_FILE;
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}
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else if (!buf)
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{
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DBUG_RETURN(info->lastpos==HA_OFFSET_ERROR ? my_errno : 0);
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}
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else if (!(*info->read_record)(info,info->lastpos,buf))
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{
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info->update|= HA_STATE_AKTIV; /* Record is read */
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DBUG_RETURN(0);
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}
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DBUG_RETURN(my_errno);
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} /* mi_rprev */
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