1 files changed, 27 insertions, 0 deletions
diff --git a/staging_vespalib/src/vespa/vespalib/metrics/clock.cpp b/staging_vespalib/src/vespa/vespalib/metrics/clock.cpp
new file mode 100644
index 00000000000..088dd721cbf
--- /dev/null
+++ b/staging_vespalib/src/vespa/vespalib/metrics/clock.cpp
@@ -0,0 +1,27 @@
+// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+#include "clock.h"
+
+namespace vespalib {
+
+std::chrono::microseconds since_epoch(InternalTimeStamp stamp)
+{
+    using namespace std::chrono;
+    using MyInt = microseconds::rep;
+
+    auto before = system_clock::now();
+    auto now    = steady_clock::now();
+    auto after  = system_clock::now();
+
+    MyInt beforems = (time_point_cast<microseconds>(before)).time_since_epoch().count();
+    MyInt nowms    = (time_point_cast<microseconds>(now)).time_since_epoch().count();
+    MyInt afterms  = (time_point_cast<microseconds>(after)).time_since_epoch().count();
+
+    MyInt difference = beforems - nowms;
+    MyInt adjust = (afterms - beforems) / 2;
+
+    MyInt stampms = stamp.time_since_epoch().count();
+
+    return microseconds(stampms + difference + adjust);
+}
+
+} // namespace vespalib