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diff --git a/extern/ceres/internal/ceres/thread_token_provider.cc b/extern/ceres/internal/ceres/thread_token_provider.cc
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+++ b/extern/ceres/internal/ceres/thread_token_provider.cc
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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2017 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: yp@photonscore.de (Yury Prokazov)
+
+#include "ceres/thread_token_provider.h"
+
+#ifdef CERES_USE_OPENMP
+#include <omp.h>
+#endif
+
+namespace ceres {
+namespace internal {
+
+ThreadTokenProvider::ThreadTokenProvider(int num_threads) {
+  (void)num_threads;
+#ifdef CERES_USE_CXX_THREADS
+  for (int i = 0; i < num_threads; i++) {
+    pool_.Push(i);
+  }
+#endif
+
+}
+
+int ThreadTokenProvider::Acquire() {
+#ifdef CERES_USE_OPENMP
+  return omp_get_thread_num();
+#endif
+
+#ifdef CERES_NO_THREADS
+  return 0;
+#endif
+
+#ifdef CERES_USE_CXX_THREADS
+  int thread_id;
+  CHECK(pool_.Wait(&thread_id));
+  return thread_id;
+#endif
+
+}
+
+void ThreadTokenProvider::Release(int thread_id) {
+  (void)thread_id;
+#ifdef CERES_USE_CXX_THREADS
+  pool_.Push(thread_id);
+#endif
+
+}
+
+}  // namespace internal
+}  // namespace ceres