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vlcdemo/vlc/vlc3/include64/plugins/vlc_gcrypt.h

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+/*****************************************************************************
+ * vlc_gcrypt.h: VLC thread support for gcrypt
+ *****************************************************************************
+ * Copyright (C) 2004-2010 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.
+ *****************************************************************************/
+
+/**
+ * \file
+ * This file implements gcrypt support functions in vlc
+ */
+
+#include <errno.h>
+
+static inline void vlc_gcrypt_init (void)
+{
+    /* This would need a process-wide static mutex with all libraries linking
+     * to a given instance of libgcrypt. We cannot do this as we have different
+     * plugins linking with gcrypt, and some underlying libraries may use it
+     * behind our back. Only way is to always link gcrypt statically (ouch!) or
+     * have upstream gcrypt provide one shared object per threading system. */
+    static bool done = false;
+
+    vlc_global_lock (VLC_GCRYPT_MUTEX);
+    if (!done)
+    {
+        /* The suggested way for an application to make sure that global_init
+         * has been called is by using gcry_check_version. (see global_init
+         * comments in gcrypt sources) */
+        gcry_check_version(NULL);
+        done = true;
+    }
+    vlc_global_unlock (VLC_GCRYPT_MUTEX);
+}