cleanup: TABLE_SHARE::lock_share() helper

also: renames, s/const/constexpr/ for consistency

sql/sql_base.cc

@@ -9838,12 +9838,10 @@ int TABLE::hlindex_open(uint nr)
   DBUG_ASSERT(nr == s->keys);
   if (!hlindex)
   {
-    if (s->tmp_table == NO_TMP_TABLE)
-      mysql_mutex_lock(&s->LOCK_share);
+    s->lock_share();
     if (!s->hlindex)
     {
-      if (s->tmp_table == NO_TMP_TABLE)
-        mysql_mutex_unlock(&s->LOCK_share);
+      s->unlock_share();
       TABLE_SHARE *share;
       char *path= NULL;
       size_t path_len= s->normalized_path.length + HLINDEX_BUF_LEN;
@@ -9867,26 +9865,20 @@ int TABLE::hlindex_open(uint nr)
         return 1;
       }
 
-      if (s->tmp_table == NO_TMP_TABLE)
-        mysql_mutex_lock(&s->LOCK_share);
+      s->lock_share();
       if (!s->hlindex)
       {
         s->hlindex= share;
-        if (s->tmp_table == NO_TMP_TABLE)
-          mysql_mutex_unlock(&s->LOCK_share);
+        s->unlock_share();
       }
       else
       {
-        if (s->tmp_table == NO_TMP_TABLE)
-          mysql_mutex_unlock(&s->LOCK_share);
+        s->unlock_share();
         free_table_share(share);
       }
     }
     else
-    {
-      if (s->tmp_table == NO_TMP_TABLE)
-        mysql_mutex_unlock(&s->LOCK_share);
-    }
+      s->unlock_share();
     TABLE *table= (TABLE*)alloc_root(&mem_root, sizeof(*table));
     if (!table || open_table_from_share(in_use, s->hlindex, &empty_clex_str,
                     db_stat, EXTRA_RECORD, in_use->open_options, table, 0))

sql/sql_table.cc

@@ -2083,13 +2083,14 @@ bool log_drop_table(THD *thd, const LEX_CSTRING *db_name,
 }
 
 
-static int get_hlindex_keys(THD *thd, const LEX_CSTRING *db,
-                            const LEX_CSTRING *table_name, const char *path,
-                            uint *keys, uint *total_keys)
+static int get_hlindex_keys_by_open(THD *thd, const LEX_CSTRING *db,
+                                    const LEX_CSTRING *table_name,
+                                    const char *path, uint *keys,
+                                    uint *total_keys)
 {
   TABLE_SHARE share;
   int error;
-  DBUG_ENTER("get_hlindex_keys");
+  DBUG_ENTER("get_hlindex_keys_by_open");
 
   init_tmp_table_share(thd, &share, db->str, 0, table_name->str, path, 1);
   error= open_table_def(thd, &share, GTS_TABLE | GTS_USE_DISCOVERY);
@@ -2146,8 +2147,8 @@ bool quick_rm_table(THD *thd, handlerton *base, const LEX_CSTRING *db,
   if (flags & QRMT_HANDLER)
   {
     uint keys, total_keys;
-    int hlindex_error= get_hlindex_keys(thd, db, table_name, path, &keys,
-                                        &total_keys);
+    int hlindex_error= get_hlindex_keys_by_open(thd, db, table_name, path,
+                                                &keys, &total_keys);
     error|= ha_delete_table(thd, base, path, db, table_name, 0) > 0;
     if (!hlindex_error)
     {
@@ -5424,7 +5425,8 @@ mysql_rename_table(handlerton *base, const LEX_CSTRING *old_db,
       char *idx_to_end= strmov(idx_to, to_base);
       uint keys, total_keys;
 
-      if (!get_hlindex_keys(thd, new_db, new_name, to, &keys, &total_keys))
+      if (!get_hlindex_keys_by_open(thd, new_db, new_name, to, &keys,
+                                    &total_keys))
       {
         for (uint i= keys; i < total_keys; i++)
         {

sql/sql_table.h

@@ -63,9 +63,9 @@ enum enum_explain_filename_mode
 #define WFRM_BACKUP_ORIGINAL 16
 
 /* Flags for conversion functions. */
-static const uint FN_FROM_IS_TMP=  1 << 0;
-static const uint FN_TO_IS_TMP=    1 << 1;
-static const uint FN_IS_TMP=       FN_FROM_IS_TMP | FN_TO_IS_TMP;
+static constexpr uint FN_FROM_IS_TMP=  1 << 0;
+static constexpr uint FN_TO_IS_TMP=    1 << 1;
+static constexpr uint FN_IS_TMP=       FN_FROM_IS_TMP | FN_TO_IS_TMP;
 /* Remove .frm table metadata. */
 static constexpr uint QRMT_FRM=       1 << 2;
 /* Remove .par partitioning metadata. */
@@ -75,9 +75,9 @@ static constexpr uint QRMT_HANDLER=   1 << 4;
 /* Default behaviour is to drop .FRM and handler, but not .par. */
 static constexpr uint QRMT_DEFAULT=   QRMT_FRM | QRMT_HANDLER;
 /** Don't resolve MySQL's fake "foo.sym" symbolic directory names. */
-static const uint SKIP_SYMDIR_ACCESS= 1 << 5;
+static constexpr uint SKIP_SYMDIR_ACCESS= 1 << 5;
 /** Don't check foreign key constraints while renaming table */
-static const uint NO_FK_CHECKS=    1 << 6;
+static constexpr uint NO_FK_CHECKS=    1 << 6;
 
 uint filename_to_tablename(const char *from, char *to, size_t to_length,
                            bool stay_quiet = false);

sql/table.cc

@@ -8284,8 +8284,7 @@ void TABLE::mark_columns_used_by_virtual_fields(void)
   if (s->check_set_initialized)
     return;
 
-  if (s->tmp_table == NO_TMP_TABLE)
-    mysql_mutex_lock(&s->LOCK_share);
+  s->lock_share();
   if (s->check_set)
   {
     /* Mark fields used by check constraint */
@@ -8325,8 +8324,7 @@ void TABLE::mark_columns_used_by_virtual_fields(void)
     bitmap_clear_all(&tmp_set);
   }
   s->check_set_initialized= v_keys;
-  if (s->tmp_table == NO_TMP_TABLE)
-    mysql_mutex_unlock(&s->LOCK_share);
+  s->unlock_share();
 }
 
 /* Add fields used by CHECK CONSTRAINT to read map */

sql/table.h

@@ -728,6 +728,9 @@ struct TABLE_SHARE
   mysql_mutex_t LOCK_share;             /* To protect TABLE_SHARE */
   mysql_mutex_t LOCK_statistics;        /* To protect against concurrent load */
 
+  void lock_share() { if (!tmp_table) mysql_mutex_lock(&LOCK_share); }
+  void unlock_share() { if (!tmp_table) mysql_mutex_unlock(&LOCK_share); }
+
   TDC_element *tdc;
 
   LEX_CUSTRING tabledef_version;

sql/vector_mhnsw.cc

@@ -437,13 +437,13 @@ class MHNSW_Context : public Sql_alloc
 
   virtual void reset(TABLE_SHARE *share)
   {
-    mysql_mutex_lock(&share->LOCK_share);
+    share->lock_share();
     if (static_cast<MHNSW_Context*>(share->hlindex->hlindex_data) == this)
     {
       share->hlindex->hlindex_data= nullptr;
       --refcnt;
     }
-    mysql_mutex_unlock(&share->LOCK_share);
+    share->unlock_share();
   }
 
   void release(TABLE *table)
@@ -648,8 +648,7 @@ MHNSW_Trx *MHNSW_Trx::get_from_thd(TABLE *table, bool for_update)
 
 MHNSW_Context *MHNSW_Context::get_from_share(TABLE_SHARE *share, TABLE *table)
 {
-  if (share->tmp_table == NO_TMP_TABLE)
-    mysql_mutex_lock(&share->LOCK_share);
+  share->lock_share();
   auto ctx= static_cast<MHNSW_Context*>(share->hlindex->hlindex_data);
   if (!ctx && table)
   {
@@ -660,8 +659,7 @@ MHNSW_Context *MHNSW_Context::get_from_share(TABLE_SHARE *share, TABLE *table)
   }
   if (ctx)
     ctx->refcnt++;
-  if (share->tmp_table == NO_TMP_TABLE)
-    mysql_mutex_unlock(&share->LOCK_share);
+  share->unlock_share();
   return ctx;
 }