aout: remove aout_DecIsEmpty()

[vlc] / include / vlc_xlib.h

diff --git a/include/vlc_xlib.h b/include/vlc_xlib.h
index 4e3632c34180484d0fc1dfb4150708558754d8d7..b6818c15d489fcad4c4831e0d4b071aaf635fb3c 100644 (file)
--- a/include/vlc_xlib.h
+++ b/include/vlc_xlib.h
@@ -3,38 +3,54 @@
  *****************************************************************************
  * Copyright (C) 2010 Rémi Denis-Courmont
  *
- * 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; either version 2 of the License, or
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
  * (at your option) any later version.
  *
  * 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.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser 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 Street, Fifth Floor, Boston MA 02110-1301, USA.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  *****************************************************************************/
 
 #ifndef VLC_XLIB_H
 # define VLC_XLIB_H 1
 
+# include <stdio.h>
+# include <stdlib.h>
 # include <X11/Xlib.h>
+# include <X11/Xlibint.h>
 
 static inline bool vlc_xlib_init (vlc_object_t *obj)
 {
+    if (!var_InheritBool (obj, "xlib"))
+        return false;
+
     bool ok = false;
 
-    if (var_InheritBool (obj, "xlib"))
-    {
-        /* XInitThreads() can be called multiple times,
-         * but it is not reentrant. */
-        vlc_global_lock (VLC_XLIB_MUTEX);
-        ok = XInitThreads () != 0;
-        vlc_global_unlock (VLC_XLIB_MUTEX);
-    }
+    /* XInitThreads() can be called multiple times,
+     * but it is not reentrant, so we need this global lock. */
+    vlc_global_lock (VLC_XLIB_MUTEX);
+
+    if (_Xglobal_lock == NULL && unlikely(_XErrorFunction != NULL))
+        /* (_Xglobal_lock == NULL) => Xlib threads not initialized */
+        /* (_XErrorFunction != NULL) => Xlib already in use */
+        fprintf (stderr, "%s:%u:%s: Xlib not initialized for threads.\n"
+                 "This process is probably using LibVLC incorrectly.\n"
+                 "Pass \"--no-xlib\" to libvlc_new() to fix this.\n",
+                 __FILE__, __LINE__, __func__);
+    else if (XInitThreads ())
+        ok = true;
+
+    vlc_global_unlock (VLC_XLIB_MUTEX);
+
+    if (!ok)
+        msg_Err (obj, "Xlib not initialized for threads");
     return ok;
 }