Jacques Lucke
45d59e0df5
This namespace groups threading related functions/classes. This avoids adding more threading related stuff to the blender namespace. Also it makes naming a bit easier, e.g. the c++ version of BLI_task_isolate could become blender::threading::isolate_task or something similar. Differential Revision: https://developer.blender.org/D11624
74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#ifdef WITH_TBB
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# include <tbb/enumerable_thread_specific.h>
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#endif
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#include <atomic>
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#include <mutex>
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#include "BLI_map.hh"
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#include "BLI_utility_mixins.hh"
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namespace blender::threading {
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namespace enumerable_thread_specific_utils {
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inline std::atomic<int> next_id = 0;
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inline thread_local int thread_id = next_id.fetch_add(1, std::memory_order_relaxed);
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} // namespace enumerable_thread_specific_utils
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/**
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* This is mainly a wrapper for `tbb::enumerable_thread_specific`. The wrapper is needed because we
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* want to be able to build without tbb.
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*
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* More features of the tbb version can be wrapped when they are used.
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*/
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template<typename T> class EnumerableThreadSpecific : NonCopyable, NonMovable {
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#ifdef WITH_TBB
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private:
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tbb::enumerable_thread_specific<T> values_;
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public:
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T &local()
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{
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return values_.local();
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}
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#else /* WITH_TBB */
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private:
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std::mutex mutex_;
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/* Maps thread ids to their corresponding values. The values are not embedded in the map, so that
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* their addresses do not change when the map grows. */
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Map<int, std::unique_ptr<T>> values_;
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public:
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T &local()
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{
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const int thread_id = enumerable_thread_specific_utils::thread_id;
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std::lock_guard lock{mutex_};
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return *values_.lookup_or_add_cb(thread_id, []() { return std::make_unique<T>(); });
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}
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#endif /* WITH_TBB */
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};
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} // namespace blender::threading
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