include/vlc_xlib.h

   1 /*****************************************************************************
   2  * vlc_xlib.h: initialization of Xlib
   3  *****************************************************************************
   4  * Copyright (C) 2010 Rémi Denis-Courmont
   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 Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifndef VLC_XLIB_H
  22 # define VLC_XLIB_H 1
  23
  24 # include <stdio.h>
  25 # include <stdlib.h>
  26 # include <X11/Xlib.h>
  27 # include <X11/Xlibint.h>
  28
  29 static inline bool vlc_xlib_init (vlc_object_t *obj)
  30 {
  31     if (!var_InheritBool (obj, "xlib"))
  32         return false;
  33
  34     bool ok = false;
  35
  36     /* XInitThreads() can be called multiple times,
  37      * but it is not reentrant, so we need this global lock. */
  38     vlc_global_lock (VLC_XLIB_MUTEX);
  39
  40     if (_Xglobal_lock == NULL && unlikely(_XErrorFunction != NULL))
  41         /* (_Xglobal_lock == NULL) => Xlib threads not initialized */
  42         /* (_XErrorFunction != NULL) => Xlib already in use */
  43         fprintf (stderr, "%s:%u:%s: Xlib not initialized for threads.\n"
  44                  "This process is probably using LibVLC incorrectly.\n"
  45                  "Pass \"--no-xlib\" to libvlc_new() to fix this.\n",
  46                  __FILE__, __LINE__, __func__);
  47     else if (XInitThreads ())
  48         ok = true;
  49
  50     vlc_global_unlock (VLC_XLIB_MUTEX);
  51
  52     if (!ok)
  53         msg_Err (obj, "Xlib not initialized for threads");
  54     return ok;
  55 }
  56
  57 #endif