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Diffstat (limited to 'extern/ceres/internal/ceres/parallel_for.h')
-rw-r--r-- | extern/ceres/internal/ceres/parallel_for.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/extern/ceres/internal/ceres/parallel_for.h b/extern/ceres/internal/ceres/parallel_for.h new file mode 100644 index 00000000000..2da2320c137 --- /dev/null +++ b/extern/ceres/internal/ceres/parallel_for.h @@ -0,0 +1,67 @@ +// 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_ |