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diff --git a/include/zmq_utils.h b/include/zmq_utils.h
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+/*
+ Copyright (c) 2007-2010 iMatix Corporation
+
+ This file is part of 0MQ.
+
+ 0MQ is free software; you can redistribute it and/or modify it under
+ the terms of the Lesser GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ 0MQ 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
+ Lesser GNU General Public License for more details.
+
+ You should have received a copy of the Lesser GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_UTILS_H_INCLUDED__
+#define __ZMQ_UTILS_H_INCLUDED__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Win32 needs special handling for DLL exports */
+#if defined _WIN32
+# if defined DLL_EXPORT
+# define ZMQ_EXPORT __declspec(dllexport)
+# else
+# define ZMQ_EXPORT __declspec(dllimport)
+# endif
+#else
+# define ZMQ_EXPORT
+#endif
+
+/* Helper functions are used by perf tests so that they don't have to care */
+/* about minutiae of time-related functions on different OS platforms. */
+
+/* Starts the stopwatch. Returns the handle to the watch. */
+ZMQ_EXPORT void *zmq_stopwatch_start ();
+
+/* Stops the stopwatch. Returns the number of microseconds elapsed since */
+/* the stopwatch was started. */
+ZMQ_EXPORT unsigned long zmq_stopwatch_stop (void *watch_);
+
+/* Sleeps for specified number of seconds. */
+ZMQ_EXPORT void zmq_sleep (int seconds_);
+
+#undef ZMQ_EXPORT
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif