global_threads.h

/* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

#ifndef GLOBAL_THREADS_INCLUDED
#define GLOBAL_THREADS_INCLUDED

#include <my_global.h>
#include <my_pthread.h>
#include <set>

class THD;

extern mysql_mutex_t LOCK_thread_count;
extern mysql_cond_t COND_thread_count;

typedef std::set<THD*>::iterator Thread_iterator;
Thread_iterator global_thread_list_begin();
Thread_iterator global_thread_list_end();
void add_global_thread(THD *);
void remove_global_thread(THD *);

/*
  We maintain a separate counter for the number of threads,
  which can be accessed without LOCK_thread_count.
  An un-locked read, means that the result is fuzzy of course.
  This accessor is used by DBUG printing, by signal handlers,
  and by the 'mysqladmin status' command.
*/
uint get_thread_count();

#endif  // GLOBAL_THREADS_INCLUDED