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Simpler arena swapping code

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Now thd->mem_root is a pointer to thd->main_mem_root and THR_MALLOC is a pointer to thd->mem_root.
This gives us the following benefits:
- Allow us to easily detect if arena has already been swapped before (this fixes a bug in setup_conds() where arena was swaped twice in some cases)
- Faster swaps of arenas (as we don't have to copy the whole MEM_ROOT)
- We don't anymore have to call my_pthread_setspecific_ptr(THR_MALLOC,...) to change where memory is alloced. Now it's enough to set thd->mem_root
This commit is contained in:
monty@mysql.com
2004-11-08 01:13:54 +02:00
parent e93450d442
commit b903a129e2
32 changed files with 243 additions and 216 deletions
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15
sql/opt_range.cc
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@ -400,7 +400,7 @@ QUICK_SELECT::QUICK_SELECT(THD *thd, TABLE *table, uint key_nr, bool no_alloc)
{
// Allocates everything through the internal memroot
init_sql_alloc(&alloc, thd->variables.range_alloc_block_size, 0);
my_pthread_setspecific_ptr(THR_MALLOC,&alloc);
thd->mem_root= &alloc;
}
else
bzero((char*) &alloc,sizeof(alloc));
@ -668,8 +668,8 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
DBUG_RETURN(0); // Can't use range
}
key_parts= param.key_parts;
old_root=my_pthread_getspecific_ptr(MEM_ROOT*,THR_MALLOC);
my_pthread_setspecific_ptr(THR_MALLOC,&alloc);
old_root= thd->mem_root;
thd->mem_root= &alloc;
key_info= head->key_info;
for (idx=0 ; idx < head->keys ; idx++, key_info++)
@ -769,7 +769,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
}
}
free_root(&alloc,MYF(0)); // Return memory & allocator
my_pthread_setspecific_ptr(THR_MALLOC,old_root);
thd->mem_root= old_root;
thd->no_errors=0;
}
DBUG_EXECUTE("info",print_quick(quick,&needed_reg););
@ -2563,7 +2563,8 @@ static bool null_part_in_key(KEY_PART *key_part, const char *key, uint length)
QUICK_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table, TABLE_REF *ref)
{
MEM_ROOT *old_root= my_pthread_getspecific_ptr(MEM_ROOT*, THR_MALLOC);
MEM_ROOT *old_root= thd->mem_root;
/* The following call may change thd->mem_root */
QUICK_SELECT *quick= new QUICK_SELECT(thd, table, ref->key);
KEY *key_info = &table->key_info[ref->key];
KEY_PART *key_part;
@ -2624,11 +2625,11 @@ QUICK_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table, TABLE_REF *ref)
}
ok:
my_pthread_setspecific_ptr(THR_MALLOC, old_root);
thd->mem_root= old_root;
return quick;
err:
my_pthread_setspecific_ptr(THR_MALLOC, old_root);
thd->mem_root= old_root;
delete quick;
return 0;
}