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vlcdemo/vlc/vlc3/include/plugins/vlc_xlib.h

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+/*****************************************************************************
+ * vlc_xlib.h: initialization of Xlib
+ *****************************************************************************
+ * 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 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 Lesser General Public License for more details.
+ *
+ * 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;
+
+    /* 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;
+}
+
+#endif