-#define _GNU_SOURCE
+// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
#include <string.h>
#include <sys/time.h>
#include <poll.h>
#ifdef RCU_MEMBARRIER
#include <urcu.h>
#endif
-#ifdef RCU_SIGNAL
-#include <urcu.h>
-#endif
#ifdef RCU_MB
#include <urcu.h>
#endif