Function plugin_lock_by_name

sql/sql_plugin.cc:1077–1090

Notes on lifetime: If THD is passed as non-NULL (and with a non-NULL thd->lex), an entry is made in the thd->lex which will cause an automatic unlock of the plugin in the LEX destructor. In this case, no manual unlock must be done. Otherwise, when passing a NULL THD, the caller must arrange that plugin unlock happens later. */

  unlock happens later.
*/
plugin_ref plugin_lock_by_name(THD *thd, const LEX_CSTRING *name, int type)
{
  LEX *lex= thd ? thd->lex : 0;
  plugin_ref rc= NULL;
  st_plugin_int *plugin;
  DBUG_ENTER("plugin_lock_by_name");
  if (!name->length)
    DBUG_RETURN(NULL);
  mysql_mutex_lock(&LOCK_plugin);
  if ((plugin= plugin_find_internal(name, type)))
    rc= intern_plugin_lock(lex, plugin_int_to_ref(plugin));
  mysql_mutex_unlock(&LOCK_plugin);
  DBUG_RETURN(rc);
}


static st_plugin_int *plugin_insert_or_reuse(struct st_plugin_int *plugin)