| // 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" |
| #include "ceres/internal/port.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. |
| CERES_EXPORT_INTERNAL 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(). |
| CERES_EXPORT_INTERNAL 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_ |