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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2015 Google Inc. All rights reserved.
+// http://ceres-solver.org/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors may be
+//   used to endorse or promote products derived from this software without
+//   specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: strandmark@google.com (Petter Strandmark)
+
+#ifndef CERES_INTERNAL_WALL_TIME_H_
+#define CERES_INTERNAL_WALL_TIME_H_
+
+#include <map>
+#include <string>
+#include "ceres/internal/port.h"
+#include "ceres/stringprintf.h"
+#include "glog/logging.h"
+
+namespace ceres {
+namespace internal {
+
+// Returns time, in seconds, from some arbitrary starting point. If
+// OpenMP is available then the high precision openmp_get_wtime()
+// function is used. Otherwise on unixes, gettimeofday is used. The
+// granularity is in seconds on windows systems.
+double WallTimeInSeconds();
+
+// Log a series of events, recording for each event the time elapsed
+// since the last event and since the creation of the object.
+//
+// The information is output to VLOG(3) upon destruction. A
+// name::Total event is added as the final event right before
+// destruction.
+//
+// Example usage:
+//
+//  void Foo() {
+//    EventLogger event_logger("Foo");
+//    Bar1();
+//    event_logger.AddEvent("Bar1")
+//    Bar2();
+//    event_logger.AddEvent("Bar2")
+//    Bar3();
+//  }
+//
+// Will produce output that looks like
+//
+//  Foo
+//      Bar1:  time1  time1
+//      Bar2:  time2  time1 + time2;
+//     Total:  time3  time1 + time2 + time3;
+class EventLogger {
+ public:
+  explicit EventLogger(const std::string& logger_name);
+  ~EventLogger();
+  void AddEvent(const std::string& event_name);
+
+ private:
+  const double start_time_;
+  double last_event_time_;
+  std::string events_;
+};
+
+}  // namespace internal
+}  // namespace ceres
+
+#endif  // CERES_INTERNAL_WALL_TIME_H_