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diff --git a/common/library.h b/common/library.h
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+/*
+ * Copyright (c) 2011 Collabora Ltd
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *     * Redistributions of source code must retain the above
+ *       copyright notice, this list of conditions and the
+ *       following disclaimer.
+ *     * Redistributions in binary form must reproduce the
+ *       above copyright notice, this list of conditions and
+ *       the following disclaimer in the documentation and/or
+ *       other materials provided with the distribution.
+ *     * The names of contributors to this software may not be
+ *       used to endorse or promote products derived from this
+ *       software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ *
+ * CONTRIBUTORS
+ *  Stef Walter <stef@memberwebs.com>
+ */
+
+#ifndef P11_LIBRARY_H_
+#define P11_LIBRARY_H_
+
+#include "config.h"
+#include "compat.h"
+
+#include <sys/types.h>
+
+extern p11_mutex_t p11_library_mutex;
+
+#define       p11_lock()                   p11_mutex_lock (&p11_library_mutex);
+
+#define       p11_unlock()                 p11_mutex_unlock (&p11_library_mutex);
+
+void          p11_message                  (const char* msg,
+                                            ...) GNUC_PRINTF (1, 2);
+
+void          p11_message_store            (const char* msg,
+                                            size_t length);
+
+const char *  p11_message_last             (void);
+
+void          p11_message_clear            (void);
+
+void          p11_message_quiet            (void);
+
+#ifdef OS_WIN32
+
+/* No implementation, because done by DllMain */
+#define       p11_library_init_once()
+
+#else /* !OS_WIN32 */
+extern pthread_once_t p11_library_once;
+
+#define       p11_library_init_once() \
+	pthread_once (&p11_library_once, p11_library_init);
+
+#endif /* !OS_WIN32 */
+
+void          p11_library_init             (void);
+
+void          p11_library_uninit           (void);
+
+#endif /* P11_LIBRARY_H_ */