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, 155 insertions, 0 deletions

diff --git a/storage/myisam/mi_rnext.c b/storage/myisam/mi_rnext.c
new file mode 100644
index 00000000..7124c102
--- /dev/null
+++ b/storage/myisam/mi_rnext.c
@@ -0,0 +1,155 @@
+/*
+   Copyright (c) 2000, 2010, Oracle and/or its affiliates
+
+   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
+	   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(MI_INFO *info, uchar *buf, int inx)
+{
+  int error,changed;
+  uint flag;
+  check_result_t check= CHECK_POS;
+  uint update_mask= HA_STATE_NEXT_FOUND;
+  DBUG_ENTER("mi_rnext");
+
+  if ((inx = _mi_check_index(info,inx)) < 0)
+    DBUG_RETURN(my_errno);
+  flag=SEARCH_BIGGER;				/* Read next */
+  if (info->lastpos == HA_OFFSET_ERROR && info->update & HA_STATE_PREV_FOUND)
+    flag=0;					/* Read first */
+
+  if (fast_mi_readinfo(info))
+    DBUG_RETURN(my_errno);
+  if (info->s->concurrent_insert)
+    mysql_rwlock_rdlock(&info->s->key_root_lock[inx]);
+  changed=_mi_test_if_changed(info);
+  if (!flag)
+  {
+    switch(info->s->keyinfo[inx].key_alg){
+#ifdef HAVE_RTREE_KEYS
+    case HA_KEY_ALG_RTREE:
+      error=rtree_get_first(info,inx,info->lastkey_length);
+      break;
+#endif
+    case HA_KEY_ALG_BTREE:
+    default:
+      error=_mi_search_first(info,info->s->keyinfo+inx,
+			   info->s->state.key_root[inx]);
+      break;
+    }
+    /*
+      "search first" failed. This means we have no pivot for
+      "search next", or in other words MI_INFO::lastkey is
+      likely uninitialized.
+
+      Normally SQL layer would never request "search next" if
+      "search first" failed. But HANDLER may do anything.
+
+      As mi_rnext() without preceding mi_rkey()/mi_rfirst()
+      equals to mi_rfirst(), we must restore original state
+      as if failing mi_rfirst() was not called.
+    */
+    if (error)
+      update_mask|= HA_STATE_PREV_FOUND;
+  }
+  else
+  {
+    switch (info->s->keyinfo[inx].key_alg) {
+#ifdef HAVE_RTREE_KEYS
+    case HA_KEY_ALG_RTREE:
+      /*
+	Note that rtree doesn't support that the table
+	may be changed since last call, so we do need
+	to skip rows inserted by other threads like in btree
+      */
+      error= rtree_get_next(info,inx,info->lastkey_length);
+      break;
+#endif
+    case HA_KEY_ALG_BTREE:
+    default:
+      if (!changed)
+	error= _mi_search_next(info,info->s->keyinfo+inx,info->lastkey,
+			       info->lastkey_length,flag,
+			       info->s->state.key_root[inx]);
+      else
+	error= _mi_search(info,info->s->keyinfo+inx,info->lastkey,
+			  USE_WHOLE_KEY,flag, info->s->state.key_root[inx]);
+    }
+  }
+
+  if (!error)
+  {
+    while ((info->s->concurrent_insert &&
+            info->lastpos >= info->state->data_file_length) ||
+           (check= mi_check_index_tuple(info, inx, buf)) == CHECK_NEG)
+    {
+      /*
+        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;
+      }
+
+      /* 
+         Skip rows that are either inserted by other threads since
+         we got a lock or do not match pushed index conditions
+      */
+      if  ((error=_mi_search_next(info,info->s->keyinfo+inx,
+                                  info->lastkey,
+                                  info->lastkey_length,
+                                  SEARCH_BIGGER,
+                                  info->s->state.key_root[inx])))
+        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|= update_mask;
+
+  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_PRINT("error",("Got error: %d,  errno: %d",error, my_errno));
+  DBUG_RETURN(my_errno);
+} /* mi_rnext */