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/heap/hp_block.c b/storage/heap/hp_block.c
new file mode 100644
index 00000000..324efc8b
--- /dev/null
+++ b/storage/heap/hp_block.c
@@ -0,0 +1,155 @@
+/* Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
+
+   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 */
+
+/* functions on blocks; Keys and records are saved in blocks */
+
+#include "heapdef.h"
+
+/*
+  Find record according to record-position.
+      
+  The record is located by factoring position number pos into (p_0, p_1, ...) 
+  such that
+     pos = SUM_i(block->level_info[i].records_under_level * p_i)
+  {p_0, p_1, ...} serve as indexes to descend the blocks tree.
+*/
+
+uchar *hp_find_block(HP_BLOCK *block, ulong pos)
+{
+  reg1 int i;
+  reg3 HP_PTRS *ptr; /* block base ptr */
+
+  for (i=block->levels-1, ptr=block->root ; i > 0 ; i--)
+  {
+    ptr=(HP_PTRS*)ptr->blocks[pos/block->level_info[i].records_under_level];
+    pos%=block->level_info[i].records_under_level;
+  }
+  return (uchar*) ptr+ pos*block->recbuffer;
+}
+
+
+/*
+  Get one new block-of-records. Alloc ptr to block if needed
+
+  SYNOPSIS
+    hp_get_new_block()
+      info	        heap handle
+      block             HP_BLOCK tree-like block
+      alloc_length OUT  Amount of memory allocated from the heap
+      
+  Interrupts are stopped to allow ha_panic in interrupts 
+  RETURN
+    0  OK
+    1  Out of memory
+*/
+
+int hp_get_new_block(HP_SHARE *info, HP_BLOCK *block, size_t *alloc_length)
+{
+  reg1 uint i,j;
+  HP_PTRS *root;
+
+  for (i=0 ; i < block->levels ; i++)
+    if (block->level_info[i].free_ptrs_in_block)
+      break;
+
+  /*
+    Allocate space for leaf block (data) plus space for upper level blocks
+    up to first level that has a free slot to put the pointer.
+    If this is a new level, we have to allocate pointers to all future
+    lower levels.
+
+    For example, for level 0, we allocate data for X rows.
+    When level 0 is full, we allocate data for HP_PTRS_IN_NOD + X rows.
+    Next time we allocate data for X rows.
+    When level 1 is full, we allocate data for HP_PTRS_IN_NOD at level 2 and 1
+    + X rows at level 0.
+   */
+  *alloc_length= (sizeof(HP_PTRS) * ((i == block->levels) ? i : i - 1) +
+                  (ulonglong)block->records_in_block * block->recbuffer);
+  if (!(root=(HP_PTRS*) my_malloc(hp_key_memory_HP_PTRS, *alloc_length,
+                                  MYF(MY_WME |
+                                      (info->internal ?
+                                       MY_THREAD_SPECIFIC : 0)))))
+    return 1;
+
+  if (i == 0)
+  {
+    block->levels=1;
+    block->root=block->level_info[0].last_blocks=root;
+  }
+  else
+  {
+    if ((uint) i == block->levels)
+    {
+      /* Adding a new level on top of the existing ones. */
+      block->levels=i+1;
+      /*
+        Use first allocated HP_PTRS as a top-level block. Put the current
+        block tree into the first slot of a new top-level block.
+      */
+      block->level_info[i].free_ptrs_in_block=HP_PTRS_IN_NOD-1;
+      ((HP_PTRS**) root)[0]= block->root;
+      block->root=block->level_info[i].last_blocks= root++;
+    }
+    /* Occupy the free slot we've found at level i */
+    block->level_info[i].last_blocks->
+      blocks[HP_PTRS_IN_NOD - block->level_info[i].free_ptrs_in_block--]=
+	(uchar*) root;
+    
+    /* Add a block subtree with each node having one left-most child */
+    for (j=i-1 ; j >0 ; j--)
+    {
+      block->level_info[j].last_blocks= root++;
+      block->level_info[j].last_blocks->blocks[0]=(uchar*) root;
+      block->level_info[j].free_ptrs_in_block=HP_PTRS_IN_NOD-1;
+    }
+    
+    /* 
+      root now points to last (block->records_in_block* block->recbuffer)
+      allocated bytes. Use it as a leaf block.
+    */
+    block->level_info[0].last_blocks= root;
+  }
+  return 0;
+}
+
+
+	/* free all blocks under level */
+
+uchar *hp_free_level(HP_BLOCK *block, uint level, HP_PTRS *pos, uchar *last_pos)
+{
+  int i,max_pos;
+  uchar *next_ptr;
+
+  if (level == 1)
+    next_ptr=(uchar*) pos+block->recbuffer;
+  else
+  {
+    max_pos= (block->level_info[level-1].last_blocks == pos) ?
+      HP_PTRS_IN_NOD - block->level_info[level-1].free_ptrs_in_block :
+    HP_PTRS_IN_NOD;
+
+    next_ptr=(uchar*) (pos+1);
+    for (i=0 ; i < max_pos ; i++)
+      next_ptr=hp_free_level(block,level-1,
+			      (HP_PTRS*) pos->blocks[i],next_ptr);
+  }
+  if ((uchar*) pos != last_pos)
+  {
+    my_free(pos);
+    return last_pos;
+  }
+  return next_ptr;			/* next memory position */
+}