Squashed 'third_party/ceres/' content from commit e51e9b4
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diff --git a/internal/ceres/parallel_for.h b/internal/ceres/parallel_for.h
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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2018 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: vitus@google.com (Michael Vitus)
+
+#ifndef CERES_INTERNAL_PARALLEL_FOR_
+#define CERES_INTERNAL_PARALLEL_FOR_
+
+#include <functional>
+
+#include "ceres/context_impl.h"
+
+namespace ceres {
+namespace internal {
+
+// Returns the maximum number of threads supported by the threading backend
+// Ceres was compiled with.
+int MaxNumThreadsAvailable();
+
+// Execute the function for every element in the range [start, end) with at most
+// num_threads. It will execute all the work on the calling thread if
+// num_threads is 1.
+void ParallelFor(ContextImpl* context,
+ int start,
+ int end,
+ int num_threads,
+ const std::function<void(int)>& function);
+
+// Execute the function for every element in the range [start, end) with at most
+// num_threads. It will execute all the work on the calling thread if
+// num_threads is 1. Each invocation of function() will be passed a thread_id
+// in [0, num_threads) that is guaranteed to be distinct from the value passed
+// to any concurrent execution of function().
+void ParallelFor(ContextImpl* context,
+ int start,
+ int end,
+ int num_threads,
+ const std::function<void(int thread_id, int i)>& function);
+} // namespace internal
+} // namespace ceres
+
+#endif // CERES_INTERNAL_PARALLEL_FOR_H_