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diff --git a/wsrep-lib/src/thread_service_v1.hpp b/wsrep-lib/src/thread_service_v1.hpp
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+++ b/wsrep-lib/src/thread_service_v1.hpp
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+/*
+ * Copyright (C) 2019 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-lib.
+ *
+ * Wsrep-lib is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-lib 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-lib.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef WSREP_THREAD_SERVICE_V1_HPP
+#define WSREP_THREAD_SERVICE_V1_HPP
+
+namespace wsrep
+{
+    class thread_service;
+    /**
+     * Probe thread_service_v1 support in loaded library.
+     *
+     * @param dlh Handle returned by dlopen().
+     *
+     * @return Zero on success, non-zero system error code on failure.
+     */
+    int thread_service_v1_probe(void *dlh);
+
+    /**
+     * Initialize the thread service.
+     *
+     * @param dlh Handle returned by dlopen().
+     * @params thread_service Pointer to wsrep::thread_service implementation.
+     *
+     * @return Zero on success, non-zero system error code on failure.
+     */
+    int thread_service_v1_init(void* dlh,
+                               wsrep::thread_service* thread_service);
+
+    /**
+     * Deinitialize the thread service.
+     *
+     * @params dlh Handler returned by dlopen().
+     */
+    void thread_service_v1_deinit(void* dlh);
+
+}
+
+#endif // WSREP_THREAD_SERVICE_V1_HPP