A minor change to MySQL's hash where calculation of hash can be done separately to avoid doing it under contended mutex locks

1 files changed, 9 insertions, 0 deletions

diff --git a/include/hash.h b/include/hash.h
index 629b404e8a7..b6fc365ab76 100644
--- a/include/hash.h
+++ b/include/hash.h
@@ -45,6 +45,7 @@ extern "C" {
 #define hash_element    my_hash_element
 #define hash_search     my_hash_search
 #define hash_first      my_hash_first
+#define hash_first_from_hash_value      my_hash_first_from_hash_value
 #define hash_next       my_hash_next
 #define hash_insert     my_hash_insert
 #define hash_delete     my_hash_delete
@@ -94,8 +95,16 @@ void my_hash_free(HASH *tree);
 void my_hash_reset(HASH *hash);
 uchar *my_hash_element(HASH *hash, ulong idx);
 uchar *my_hash_search(const HASH *info, const uchar *key, size_t length);
+uchar *my_hash_search_using_hash_value(const HASH *info, uint hash_value,
+                                       const uchar *key, size_t length);
+uint my_calc_hash(const HASH *info, const uchar *key, size_t length);
 uchar *my_hash_first(const HASH *info, const uchar *key, size_t length,
                      HASH_SEARCH_STATE *state);
+uchar *my_hash_first_from_hash_value(const HASH *info,
+                                     uint hash_value,
+                                     const uchar *key,
+                                     size_t length,
+                                     HASH_SEARCH_STATE *state);
 uchar *my_hash_next(const HASH *info, const uchar *key, size_t length,
                     HASH_SEARCH_STATE *state);
 my_bool my_hash_insert(HASH *info, const uchar *data);