diff --git a/tests/util.cxx b/tests/util.cxx
new file mode 100644
index 0000000..c2685ab
--- /dev/null
+++ b/tests/util.cxx
@@ -0,0 +1,76 @@
+/* Copyright 2013-2014 Pierre Ossman <ossman@cendio.se> for Cendio AB
+ * 
+ * This 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.
+ * 
+ * This software 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 this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#include <stdint.h>
+
+#ifdef WIN32
+#include <windows.h>
+#else
+#include <sys/resource.h>
+#endif
+
+#ifdef WIN32
+static FILETIME cpuCounters[2];
+#else
+struct rusage cpuCounters[2];
+#endif
+
+static void measureCpu(void *counter)
+{
+#ifdef WIN32
+  FILETIME dummy1, dummy2, dummy3;
+
+  GetProcessTimes(GetCurrentProcess(), &dummy1, &dummy2,
+                  &dummy3, (FILETIME*)counter);
+#else
+  getrusage(RUSAGE_SELF, (struct rusage*)counter);
+#endif
+}
+
+void startCpuCounter(void)
+{
+  measureCpu(&cpuCounters[0]);
+}
+
+void endCpuCounter(void)
+{
+  measureCpu(&cpuCounters[1]);
+}
+
+double getCpuCounter(void)
+{
+  double seconds;
+
+#ifdef WIN32
+  uint64_t counters[2];
+
+  counters[0] = (uint64_t)cpuCounters[0].dwHighDateTime << 32 |
+                cpuCounters[0].dwLowDateTime;
+  counters[1] = (uint64_t)cpuCounters[1].dwHighDateTime << 32 |
+                cpuCounters[1].dwLowDateTime;
+
+  seconds = (double)(counters[1] - counters[2]) / 10000000.0;
+#else
+  seconds = (double)(cpuCounters[1].ru_utime.tv_sec -
+                     cpuCounters[0].ru_utime.tv_sec);
+  seconds += (double)(cpuCounters[1].ru_utime.tv_usec -
+                      cpuCounters[0].ru_utime.tv_usec) / 1000000.0;
+#endif
+
+  return seconds;
+}