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diff --git a/tools/bench.h b/tools/bench.h
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+/*
+  Copyright 2011-2019 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/**
+   @file bench.h A simple real-time benchmarking API.
+*/
+
+#ifndef BENCH_H
+#define BENCH_H
+
+#include <time.h>
+
+typedef struct timespec BenchmarkTime;
+
+static inline double
+bench_elapsed_s(const BenchmarkTime* start, const BenchmarkTime* end)
+{
+  return ((end->tv_sec - start->tv_sec) +
+          ((end->tv_nsec - start->tv_nsec) * 0.000000001));
+}
+
+static inline BenchmarkTime
+bench_start(void)
+{
+  BenchmarkTime start_t;
+  clock_gettime(CLOCK_REALTIME, &start_t);
+  return start_t;
+}
+
+static inline double
+bench_end(const BenchmarkTime* start_t)
+{
+  BenchmarkTime end_t;
+  clock_gettime(CLOCK_REALTIME, &end_t);
+  return bench_elapsed_s(start_t, &end_t);
+}
+
+#endif /* BENCH_H */