diff options
Diffstat (limited to 'extern/ceres/internal/ceres/parallel_for_openmp.cc')
-rw-r--r-- | extern/ceres/internal/ceres/parallel_for_openmp.cc | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/extern/ceres/internal/ceres/parallel_for_openmp.cc b/extern/ceres/internal/ceres/parallel_for_openmp.cc new file mode 100644 index 00000000000..8afe3b11f8d --- /dev/null +++ b/extern/ceres/internal/ceres/parallel_for_openmp.cc @@ -0,0 +1,88 @@ +// 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) + +// This include must come before any #ifndef check on Ceres compile options. +#include "ceres/internal/port.h" + +#if defined(CERES_USE_OPENMP) + +#include "ceres/parallel_for.h" + +#include "ceres/scoped_thread_token.h" +#include "ceres/thread_token_provider.h" +#include "glog/logging.h" +#include "omp.h" + +namespace ceres { +namespace internal { + +int MaxNumThreadsAvailable() { + return omp_get_max_threads(); +} + +void ParallelFor(ContextImpl* context, + int start, + int end, + int num_threads, + const std::function<void(int)>& function) { + CHECK_GT(num_threads, 0); + CHECK(context != NULL); + if (end <= start) { + return; + } + +#ifdef CERES_USE_OPENMP +#pragma omp parallel for num_threads(num_threads) \ + schedule(dynamic) if (num_threads > 1) +#endif // CERES_USE_OPENMP + for (int i = start; i < end; ++i) { + function(i); + } +} + +void ParallelFor(ContextImpl* context, + int start, + int end, + int num_threads, + const std::function<void(int thread_id, int i)>& function) { + CHECK(context != NULL); + + ThreadTokenProvider thread_token_provider(num_threads); + ParallelFor(context, start, end, num_threads, [&](int i) { + const ScopedThreadToken scoped_thread_token(&thread_token_provider); + const int thread_id = scoped_thread_token.token(); + function(thread_id, i); + }); +} + +} // namespace internal +} // namespace ceres + +#endif // defined(CERES_USE_OPENMP) |