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Applying InnoDB snapshot

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r6798 | marko | 2010-03-11 09:53:01 +0200 (Thu, 11 Mar 2010) | 14 lines
branches/zip: Fix and clarify the latching of some buf_block_t members.

buf_block_t::check_index_page_at_flush: Note that this field is not
protected by any mutex. Make it a separate field, not a bitfield that
could share the machine word with other fields.

buf_block_t::lock_hash_val: Note that this field is protected by
buf_block_t::lock (or during block creation, by buf_pool_mutex and
buf_block_t::mutex).

buf_block_get_lock_hash_val(): Assert that block->lock is held by the
current thread.

Issue #465, rb://267 approved by Inaam Rana
This commit is contained in:
Sergey Vojtovich
2010-04-01 16:21:00 +04:00
parent 1ce8091b22
commit 2d33096d87
3 changed files with 22 additions and 3 deletions
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12
storage/innodb_plugin/include/buf0buf.h
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@@ -1179,15 +1179,21 @@ struct buf_block_struct{
rw_lock_t lock; /*!< read-write lock of the buffer
frame */
unsigned lock_hash_val:32;/*!< hashed value of the page address
in the record lock hash table */
unsigned check_index_page_at_flush:1;
in the record lock hash table;
protected by buf_block_t::lock
(or buf_block_t::mutex, buf_pool_mutex
in buf_page_get_gen(),
buf_page_init_for_read()
and buf_page_create()) */
ibool check_index_page_at_flush;
/*!< TRUE if we know that this is
an index page, and want the database
to check its consistency before flush;
note that there may be pages in the
buffer pool which are index pages,
but this flag is not set because
we do not keep track of all pages */
we do not keep track of all pages;
NOT protected by any mutex */
/* @} */
/** @name Optimistic search field */
/* @{ */