mirror of
https://github.com/ceres-solver/ceres-solver.git
synced 2026-08-29 16:40:38 +08:00
Yury Prokazov
4ffec20a44
There are platforms where OpenMP is not available. This patch adds support for Intel Threading Building Blocks (TBB) as an alternative threading backend. Change-Id: I94497d7cba0c3cfaccfc992169236f17fe948ae9
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
// Ceres Solver - A fast non-linear least squares minimizer
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// Copyright 2017 Google Inc. All rights reserved.
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// http://ceres-solver.org/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Author: yp@photonscore.de (Yury Prokazov)
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#include "ceres/thread_token_provider.h"
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#ifdef CERES_USE_OPENMP
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#include <omp.h>
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#endif
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namespace ceres {
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namespace internal {
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ThreadTokenProvider::ThreadTokenProvider(int num_threads) {
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(void)num_threads;
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#ifdef CERES_USE_TBB
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pool_.set_capacity(num_threads);
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for (int i = 0; i < num_threads; i++) {
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pool_.push(i);
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}
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#endif
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}
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int ThreadTokenProvider::Acquire() {
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#ifdef CERES_USE_OPENMP
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return omp_get_thread_num();
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#endif
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#ifdef CERES_NO_THREADS
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return 0;
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#endif
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#ifdef CERES_USE_TBB
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int thread_id;
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pool_.pop(thread_id);
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return thread_id;
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#endif
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}
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void ThreadTokenProvider::Release(int thread_id) {
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(void)thread_id;
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#ifdef CERES_USE_TBB
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pool_.push(thread_id);
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#endif
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}
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} // namespace internal
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} // namespace ceres
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