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Diffstat (limited to 'extern/ceres/internal/ceres/thread_token_provider.cc')
-rw-r--r-- | extern/ceres/internal/ceres/thread_token_provider.cc | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/extern/ceres/internal/ceres/thread_token_provider.cc b/extern/ceres/internal/ceres/thread_token_provider.cc new file mode 100644 index 00000000000..b04cf844488 --- /dev/null +++ b/extern/ceres/internal/ceres/thread_token_provider.cc @@ -0,0 +1,76 @@ +// 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 |