diff options
Diffstat (limited to 'storage/myisam/mi_rnext_same.c')
| -rw-r--r-- | storage/myisam/mi_rnext_same.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/storage/myisam/mi_rnext_same.c b/storage/myisam/mi_rnext_same.c new file mode 100644 index 00000000..480b54f7 --- /dev/null +++ b/storage/myisam/mi_rnext_same.c @@ -0,0 +1,126 @@ +/* Copyright (c) 2000-2007 MySQL AB, 2009 Sun Microsystems, Inc. + Use is subject to license terms. + + 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 */ + +#include "myisamdef.h" +#include "rt_index.h" + + /* + Read next row with the same key as previous read, but abort if + the key changes. + One may have done a write, update or delete of the previous row. + NOTE! Even if one changes the previous row, the next read is done + based on the position of the last used key! + */ + +int mi_rnext_same(MI_INFO *info, uchar *buf) +{ + int error; + uint inx,not_used[2]; + MI_KEYDEF *keyinfo; + check_result_t check= CHECK_POS; + DBUG_ENTER("mi_rnext_same"); + + if ((int) (inx=info->lastinx) < 0 || info->lastpos == HA_OFFSET_ERROR) + DBUG_RETURN(my_errno=HA_ERR_WRONG_INDEX); + keyinfo=info->s->keyinfo+inx; + if (fast_mi_readinfo(info)) + DBUG_RETURN(my_errno); + + if (info->s->concurrent_insert) + mysql_rwlock_rdlock(&info->s->key_root_lock[inx]); + + switch (keyinfo->key_alg) + { +#ifdef HAVE_RTREE_KEYS + case HA_KEY_ALG_RTREE: + if ((error=rtree_find_next(info,inx, + myisam_read_vec[info->last_key_func]))) + { + error=1; + my_errno=HA_ERR_END_OF_FILE; + info->lastpos= HA_OFFSET_ERROR; + break; + } + break; +#endif + case HA_KEY_ALG_BTREE: + default: + if (!(info->update & HA_STATE_RNEXT_SAME)) + { + /* First rnext_same; Store old key */ + memcpy(info->lastkey2,info->lastkey,info->last_rkey_length); + } + for (;;) + { + /* + If we are at the last key on the key page, allow writers to + access the index. + */ + if (info->int_keypos >= info->int_maxpos && + mi_yield_and_check_if_killed(info, inx)) + { + error=1; + break; + } + + if ((error=_mi_search_next(info,keyinfo,info->lastkey, + info->lastkey_length,SEARCH_BIGGER, + info->s->state.key_root[inx]))) + break; + if (ha_key_cmp(keyinfo->seg, info->lastkey, info->lastkey2, + info->last_rkey_length, SEARCH_FIND, not_used)) + { + error=1; + my_errno=HA_ERR_END_OF_FILE; + info->lastpos= HA_OFFSET_ERROR; + break; + } + /* + Skip + - rows that are inserted by other threads since we got a lock + - rows that don't match index condition + */ + if (info->lastpos < info->state->data_file_length && + (check= mi_check_index_tuple(info, inx, buf)) != CHECK_NEG) + break; + } + } + if (info->s->concurrent_insert) + mysql_rwlock_unlock(&info->s->key_root_lock[inx]); + + + /* Don't clear if database-changed */ + info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED); + info->update|= HA_STATE_NEXT_FOUND | HA_STATE_RNEXT_SAME; + + if (error || check != CHECK_POS) + { + fast_mi_writeinfo(info); + if (my_errno == HA_ERR_KEY_NOT_FOUND) + my_errno=HA_ERR_END_OF_FILE; + } + else if (!buf) + { + fast_mi_writeinfo(info); + DBUG_RETURN(info->lastpos==HA_OFFSET_ERROR ? my_errno : 0); + } + else if (!(*info->read_record)(info,info->lastpos,buf)) + { + info->update|= HA_STATE_AKTIV; /* Record is read */ + DBUG_RETURN(0); + } + DBUG_RETURN(my_errno); +} /* mi_rnext_same */ |