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buf0buf.c Fixed a race condition in buf0lru and btr0sea which could corrupt the LRU list

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buf0lru.c	Fixed a race condition in buf0lru and btr0sea which could corrupt the LRU list
This commit is contained in:
heikki@donna.mysql.fi
2001-03-16 00:22:21 +02:00
parent 9d0e3f30d9
commit a1e6710b96
3 changed files with 17 additions and 1 deletions
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1
BitKeeper/etc/logging_ok
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@ -1 +1,2 @@
jani@hynda.mysql.fi jani@hynda.mysql.fi
heikki@donna.mysql.fi

13
innobase/buf/buf0buf.c
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@ -863,6 +863,19 @@ buf_page_get_known_nowait(
mutex_enter(&(buf_pool->mutex)); mutex_enter(&(buf_pool->mutex));
if (block->state == BUF_BLOCK_REMOVE_HASH) {
/* Another thread is just freeing the block from the LRU list
of the buffer pool: do not try to access this page; this
attempt to access the page can only come through the hash
index because when the buffer block state is ..._REMOVE_HASH,
we have already removed it from the page address hash table
of the buffer pool. */
mutex_exit(&(buf_pool->mutex));
return(FALSE);
}
#ifdef UNIV_SYNC_DEBUG #ifdef UNIV_SYNC_DEBUG
buf_block_buf_fix_inc_debug(block, file, line); buf_block_buf_fix_inc_debug(block, file, line);
#else #else

4
innobase/buf/buf0lru.c
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@ -138,6 +138,8 @@ buf_LRU_search_and_free_block(
mutex_enter(&(buf_pool->mutex)); mutex_enter(&(buf_pool->mutex));
ut_a(block->buf_fix_count == 0);
buf_LRU_block_free_hashed_page(block); buf_LRU_block_free_hashed_page(block);
freed = TRUE; freed = TRUE;
@ -435,7 +437,7 @@ buf_LRU_add_block_to_end_low(
defined: init it */ defined: init it */
buf_LRU_old_init(); buf_LRU_old_init();
} }
} }
/********************************************************************** /**********************************************************************