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  • Committer: Monty Taylor
  • Date: 2010-03-25 22:03:21 UTC
  • mto: This revision was merged to the branch mainline in revision 1408.
  • Revision ID: mordred@inaugust.com-20100325220321-bf5vs8tryb4a8ssh
Updated the search for libmemcached.

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drizzled/statement/drop_table.cc
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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 *
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 *  Copyright (C) 2009 Sun Microsystems, Inc.
 
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 *  Copyright (C) 2009 Sun Microsystems
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 delete (drop) tables.
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  SYNOPSIS
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   rm_table()
 
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   mysql_rm_table()
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   session                      Thread handle
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   tables               List of tables to delete
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   if_exists            If 1, don't give error if one table doesn't exists
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*/
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static bool rm_table(Session *session, TableList *tables, bool if_exists, bool drop_temporary)
 
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static bool mysql_rm_table(Session *session, TableList *tables, bool if_exists, bool drop_temporary)
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{
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  bool error, need_start_waiting= false;
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  /* mark for close and remove all cached entries */
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  if (not drop_temporary)
 
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  if (! drop_temporary)
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  {
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    if (not (need_start_waiting= not session->wait_if_global_read_lock(false, true)))
 
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    if (!(need_start_waiting= !wait_if_global_read_lock(session, false, true)))
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      return true;
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  }
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  /*
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    Acquire table::Cache::singleton().mutex() after wait_if_global_read_lock(). If we would hold
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    table::Cache::singleton().mutex() during wait_if_global_read_lock(), other threads could not
 
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    Acquire LOCK_open after wait_if_global_read_lock(). If we would hold
 
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    LOCK_open during wait_if_global_read_lock(), other threads could not
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    close their tables. This would make a pretty deadlock.
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  */
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  error= rm_table_part2(session, tables, if_exists, drop_temporary);
 
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  error= mysql_rm_table_part2(session, tables, if_exists, drop_temporary);
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  if (need_start_waiting)
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  {
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    session->startWaitingGlobalReadLock();
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  }
 
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    start_waiting_global_read_lock(session);
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  if (error)
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    return true;
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bool statement::DropTable::execute()
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{
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  TableList *first_table= (TableList *) getSession()->lex->select_lex.table_list.first;
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  TableList *all_tables= getSession()->lex->query_tables;
 
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  TableList *first_table= (TableList *) session->lex->select_lex.table_list.first;
 
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  TableList *all_tables= session->lex->query_tables;
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  assert(first_table == all_tables && first_table != 0);
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  if (not drop_temporary)
 
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  if (! drop_temporary)
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  {
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    if (getSession()->inTransaction())
 
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    if (! session->endActiveTransaction())
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    {
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      my_error(ER_TRANSACTIONAL_DDL_NOT_SUPPORTED, MYF(0));
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      return true;
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    }
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  }
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  /* DDL and binlog write order protected by table::Cache::singleton().mutex() */
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  return rm_table(getSession(), first_table, drop_if_exists, drop_temporary);
 
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  /* DDL and binlog write order protected by LOCK_open */
 
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  bool res= mysql_rm_table(session,
 
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                           first_table,
 
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                           drop_if_exists,
 
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                           drop_temporary);
 
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  return res;
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}
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} /* namespace drizzled */