Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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 */