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diff --git a/src/tools/mhd_tool_get_cpu_count.h b/src/tools/mhd_tool_get_cpu_count.h
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+++ b/src/tools/mhd_tool_get_cpu_count.h
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+/*
+ This file is part of GNU libmicrohttpd
+  Copyright (C) 2023 Evgeny Grin (Karlson2k)
+
+  This library 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 library 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 library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/**
+ * @file tools/mhd_tool_get_cpu_count.h
+ * @brief  Declaration of functions to detect the number of available
+ *         CPU cores.
+ * @author Karlson2k (Evgeny Grin)
+ */
+
+
+#ifndef SRC_TOOLS_MHD_TOOL_GET_CPU_COUNT_H_
+#define SRC_TOOLS_MHD_TOOL_GET_CPU_COUNT_H_ 1
+
+
+/**
+ * Detect the number of logical CPU cores available for the process.
+ * The number of cores available for this process could be different from
+ * value of cores available on the system. The OS may have limit on number
+ * assigned/allowed cores for single process and process may have limited
+ * CPU affinity.
+ * @return the number of logical CPU cores available for the process or
+ *         -1 if failed to detect
+ */
+int
+mhd_tool_get_proc_cpu_count (void);
+
+
+/**
+ * Try to detect the number of logical CPU cores available for the system.
+ * The number of available logical CPU cores could be changed any time due to
+ * CPU hotplug.
+ * @return the number of logical CPU cores available,
+ *         -1 if failed to detect.
+ */
+int
+mhd_tool_get_system_cpu_count (void);
+
+#endif /* SRC_TOOLS_MHD_TOOL_GET_CPU_COUNT_H_ */