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Port r53 from branches/5.0:

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Make comments about buf_block_t::index more accurate.
This commit is contained in:
marko 2005-11-17 09:00:25 +00:00
parent 71a6624a46
commit a0e75e758f
2 changed files with 10 additions and 7 deletions
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3
btr/btr0sea.c
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@ -889,7 +889,8 @@ Drops a page hash index. */
void
btr_search_drop_page_hash_index(
/*============================*/
page_t* page) /* in: index page, s- or x-latched */
page_t* page) /* in: index page, s- or x-latched, or an index page
for which we know that block->buf_fix_count == 0 */
{
hash_table_t* table;
buf_block_t* block;

14
include/buf0buf.h
View file

@ -831,7 +831,13 @@ struct buf_block_struct{
records with the same prefix should be
indexed in the hash index */
/* The following 6 fields are protected by btr_search_latch: */
/* These 6 fields may only be modified when we have
an x-latch on btr_search_latch AND
a) we are holding an s-latch or x-latch on block->lock or
b) we know that block->buf_fix_count == 0.
An exception to this is when we init or create a page
in the buffer pool in buf0buf.c. */
ibool is_hashed; /* TRUE if hash index has already been
built on this page; note that it does
@ -849,11 +855,7 @@ struct buf_block_struct{
BTR_SEARCH_RIGHT_SIDE in hash
indexing */
dict_index_t* index; /* Index for which the adaptive
hash index has been created.
This field may only be modified
while holding an s-latch or x-latch
on block->lock and an x-latch on
btr_search_latch. */
hash index has been created. */
/* 6. Debug fields */
#ifdef UNIV_SYNC_DEBUG
rw_lock_t debug_latch; /* in the debug version, each thread