Drizzled Public API Documentation

wait.cc
00001 /* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
00002  *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
00003  *
00004  *  Copyright (C) 2010 Brian Aker
00005  *
00006  *  This program is free software; you can redistribute it and/or modify
00007  *  it under the terms of the GNU General Public License as published by
00008  *  the Free Software Foundation; either version 2 of the License, or
00009  *  (at your option) any later version.
00010  *
00011  *  This program is distributed in the hope that it will be useful,
00012  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  *  GNU General Public License for more details.
00015  *
00016  *  You should have received a copy of the GNU General Public License
00017  *  along with this program; if not, write to the Free Software
00018  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00019  */
00020 
00021 #include <config.h>
00022 #include <plugin/user_locks/module.h>
00023 #include <plugin/user_locks/barrier_storage.h>
00024 
00025 #include <string>
00026 
00027 namespace user_locks {
00028 namespace barriers {
00029 
00030 int64_t Wait::val_int()
00031 {
00032   drizzled::String *res= args[0]->val_str(&value);
00033 
00034   if (res and res->length())
00035   {
00036     Barrier::shared_ptr barrier= Barriers::getInstance().find(Key(*getSession().user(), res->c_str()));
00037 
00038     if (barrier and barrier->getOwner() == getSession().getSessionId())
00039     {
00040       my_error(drizzled::ER_USER_LOCKS_CANT_WAIT_ON_OWN_BARRIER, MYF(0));
00041 
00042       return 0;
00043     }
00044     else if (barrier)
00045     {
00046       if (arg_count == 2)
00047       {
00048         int64_t generation;
00049         generation= args[1]->val_int();
00050         barrier->wait(generation);
00051       }
00052       else
00053       {
00054         boost::this_thread::restore_interruption dl(getSession().getThreadInterupt());
00055 
00056         try {
00057           barrier->wait();
00058         }
00059         catch(boost::thread_interrupted const&)
00060         {
00061           // We need to issue a different sort of error here
00062           my_error(drizzled::ER_QUERY_INTERRUPTED, MYF(0));
00063           return 0;
00064         }
00065       }
00066       null_value= false;
00067 
00068       return 1;
00069     }
00070   }
00071   else if (not res || not res->length())
00072   {
00073     my_error(drizzled::ER_USER_LOCKS_INVALID_NAME_BARRIER, MYF(0));
00074     return 0;
00075   }
00076 
00077   my_error(drizzled::ER_USER_LOCKS_UNKNOWN_BARRIER, MYF(0));
00078 
00079   return 0;
00080 }
00081 
00082 } /* namespace barriers */
00083 } /* namespace user_locks */