Drizzled Public API Documentation

wait_for_lock.cc
1 /* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
2  * vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
3  *
4  * Copyright (C) 2010 Brian Aker
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <config.h>
22 #include <plugin/user_locks/module.h>
23 
24 #include <string>
25 
26 namespace user_locks {
27 namespace locks {
28 
30 {
31  drizzled::String *res= args[0]->val_str(&value);
32 
33  if (not res || not res->length())
34  {
35  my_error(drizzled::ER_USER_LOCKS_INVALID_NAME_LOCK, MYF(0));
36  return 0;
37  }
38 
39  null_value= false;
40 
41  drizzled::session_id_t id= getSession().getSessionId();
42  bool found= false;
43 
44  while (not found)
45  {
46  found= user_locks::Locks::getInstance().isUsed(Key(*getSession().user(), res->c_str()), id);
47  if (not found)
48  {
49  boost::this_thread::restore_interruption dl(getSession().getThreadInterupt());
50  try {
51  user_locks::Locks::getInstance().waitCreate();
52  }
53  catch(boost::thread_interrupted const& error)
54  {
55  my_error(drizzled::ER_QUERY_INTERRUPTED, MYF(0));
56  null_value= true;
57  return 0;
58  }
59  }
60  else
61  {
62  if (id == getSession().getSessionId())
63  {
64  my_error(drizzled::ER_USER_LOCKS_CANT_WAIT_ON_OWN_LOCK, MYF(0));
65  null_value= true;
66  return 0;
67  }
68  }
69  }
70 
71  return id;
72 }
73 
74 } /* namespace locks */
75 } /* namespace user_locks */