--- /dev/null
+//$$CDS-header$$
+
+#include <cds/urcu/details/sh.h>
+
+#ifdef CDS_URCU_SIGNAL_HANDLING_ENABLED
+namespace cds { namespace urcu { namespace details {
+
+ template<> CDS_EXPORT_API singleton_vtbl * sh_singleton_instance< signal_buffered_tag >::s_pRCU = null_ptr<singleton_vtbl *>();
+ template<> CDS_EXPORT_API singleton_vtbl * sh_singleton_instance< signal_threaded_tag >::s_pRCU = null_ptr<singleton_vtbl *>();
+
+}}} // namespace cds::urcu::details
+
+#endif //#ifdef CDS_URCU_SIGNAL_HANDLING_ENABLED