diff options
Diffstat (limited to 'innobase/btr/btr0sea.c')
| -rw-r--r-- | innobase/btr/btr0sea.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/innobase/btr/btr0sea.c b/innobase/btr/btr0sea.c index ed746bcf12c..3c202c5a3bf 100644 --- a/innobase/btr/btr0sea.c +++ b/innobase/btr/btr0sea.c @@ -162,6 +162,8 @@ btr_search_info_create( info->last_search = NULL; info->n_direction = 0; + + info->ref_count = 0; info->root_guess = NULL; info->hash_analysis = 0; @@ -183,6 +185,31 @@ btr_search_info_create( return(info); } +/********************************************************************* +Returns the value of ref_count. The value is protected by +btr_search_latch. */ +ulint +btr_search_info_get_ref_count( +/*==========================*/ + /* out: ref_count value. */ + btr_search_t* info) /* in: search info. */ +{ + ulint ret; + + ut_ad(info); + +#ifdef UNIV_SYNC_DEBUG + ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_SHARED)); + ut_ad(!rw_lock_own(&btr_search_latch, RW_LOCK_EX)); +#endif /* UNIV_SYNC_DEBUG */ + + rw_lock_s_lock(&btr_search_latch); + ret = info->ref_count; + rw_lock_s_unlock(&btr_search_latch); + + return(ret); +} + /************************************************************************* Updates the search info of an index about hash successes. NOTE that info is NOT protected by any semaphore, to save CPU time! Do not assume its fields @@ -1019,8 +1046,12 @@ next_rec: ha_remove_all_nodes_to_page(table, folds[i], page); } + ut_a(index->search_info->ref_count > 0); + index->search_info->ref_count--; + block->is_hashed = FALSE; block->index = NULL; + cleanup: if (UNIV_UNLIKELY(block->n_pointers)) { /* Corruption */ @@ -1241,6 +1272,15 @@ btr_search_build_page_hash_index( goto exit_func; } + /* This counter is decremented every time we drop page + hash index entries and is incremented here. Since we can + rebuild hash index for a page that is already hashed, we + have to take care not to increment the counter in that + case. */ + if (!block->is_hashed) { + index->search_info->ref_count++; + } + block->is_hashed = TRUE; block->n_hash_helps = 0; |