| Austin Schuh | 70cc955 | 2019-01-21 19:46:48 -0800 | [diff] [blame^] | 1 | // Ceres Solver - A fast non-linear least squares minimizer |
| 2 | // Copyright 2017 Google Inc. All rights reserved. |
| 3 | // http://ceres-solver.org/ |
| 4 | // |
| 5 | // Redistribution and use in source and binary forms, with or without |
| 6 | // modification, are permitted provided that the following conditions are met: |
| 7 | // |
| 8 | // * Redistributions of source code must retain the above copyright notice, |
| 9 | // this list of conditions and the following disclaimer. |
| 10 | // * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | // this list of conditions and the following disclaimer in the documentation |
| 12 | // and/or other materials provided with the distribution. |
| 13 | // * Neither the name of Google Inc. nor the names of its contributors may be |
| 14 | // used to endorse or promote products derived from this software without |
| 15 | // specific prior written permission. |
| 16 | // |
| 17 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 18 | // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 21 | // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 22 | // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 23 | // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 24 | // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 25 | // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 26 | // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 27 | // POSSIBILITY OF SUCH DAMAGE. |
| 28 | // |
| 29 | // Author: yp@photonscore.de (Yury Prokazov) |
| 30 | |
| 31 | #include "ceres/thread_token_provider.h" |
| 32 | |
| 33 | #ifdef CERES_USE_OPENMP |
| 34 | #include <omp.h> |
| 35 | #endif |
| 36 | |
| 37 | namespace ceres { |
| 38 | namespace internal { |
| 39 | |
| 40 | ThreadTokenProvider::ThreadTokenProvider(int num_threads) { |
| 41 | (void)num_threads; |
| 42 | #ifdef CERES_USE_CXX11_THREADS |
| 43 | for (int i = 0; i < num_threads; i++) { |
| 44 | pool_.Push(i); |
| 45 | } |
| 46 | #endif |
| 47 | |
| 48 | } |
| 49 | |
| 50 | int ThreadTokenProvider::Acquire() { |
| 51 | #ifdef CERES_USE_OPENMP |
| 52 | return omp_get_thread_num(); |
| 53 | #endif |
| 54 | |
| 55 | #ifdef CERES_NO_THREADS |
| 56 | return 0; |
| 57 | #endif |
| 58 | |
| 59 | #ifdef CERES_USE_CXX11_THREADS |
| 60 | int thread_id; |
| 61 | CHECK(pool_.Wait(&thread_id)); |
| 62 | return thread_id; |
| 63 | #endif |
| 64 | |
| 65 | } |
| 66 | |
| 67 | void ThreadTokenProvider::Release(int thread_id) { |
| 68 | (void)thread_id; |
| 69 | #ifdef CERES_USE_CXX11_THREADS |
| 70 | pool_.Push(thread_id); |
| 71 | #endif |
| 72 | |
| 73 | } |
| 74 | |
| 75 | } // namespace internal |
| 76 | } // namespace ceres |