src/misc/threads.c

   1 /*****************************************************************************
   2  * threads.c : threads implementation for the VideoLAN client
   3  *****************************************************************************
   4  * Copyright (C) 1999-2008 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *          Gildas Bazin <gbazin@netcourrier.com>
  10  *          Clément Sténac
  11  *          Rémi Denis-Courmont
  12  *
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU Lesser General Public License as published by
  15  * the Free Software Foundation; either version 2.1 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  21  * GNU Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public License
  24  * along with this program; if not, write to the Free Software Foundation,
  25  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <assert.h>
  34
  35 /*** Global locks ***/
  36
  37 void vlc_global_mutex (unsigned n, bool acquire)
  38 {
  39     static vlc_mutex_t locks[] = {
  40         VLC_STATIC_MUTEX,
  41         VLC_STATIC_MUTEX,
  42         VLC_STATIC_MUTEX,
  43         VLC_STATIC_MUTEX,
  44         VLC_STATIC_MUTEX,
  45     };
  46     static_assert (VLC_MAX_MUTEX == (sizeof (locks) / sizeof (locks[0])),
  47                    "Wrong number of global mutexes");
  48     assert (n < (sizeof (locks) / sizeof (locks[0])));
  49
  50     vlc_mutex_t *lock = locks + n;
  51     if (acquire)
  52         vlc_mutex_lock (lock);
  53     else
  54         vlc_mutex_unlock (lock);
  55 }