Jacques Lucke
ccc2a7996b
Those are useful when you have to create containers with static storage duration. If those would use Blender's guarded allocator, it would report memory leaks, that are not actually leaks.
61 lines
1.8 KiB
C++
61 lines
1.8 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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#include <atomic>
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#include <mutex>
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#include "BLI_array.hh"
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#include "BLI_index_range.hh"
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#include "BLI_span.hh"
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#include "BLI_vector.hh"
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namespace blender {
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static RawVector<RawArray<int64_t, 0>> arrays;
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static int64_t current_array_size = 0;
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static int64_t *current_array = nullptr;
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static std::mutex current_array_mutex;
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Span<int64_t> IndexRange::as_span() const
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{
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int64_t min_required_size = start_ + size_;
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if (min_required_size <= current_array_size) {
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return Span<int64_t>(current_array + start_, size_);
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}
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std::lock_guard<std::mutex> lock(current_array_mutex);
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if (min_required_size <= current_array_size) {
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return Span<int64_t>(current_array + start_, size_);
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}
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int64_t new_size = std::max<int64_t>(1000, power_of_2_max_u(min_required_size));
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RawArray<int64_t, 0> new_array(new_size);
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for (int64_t i = 0; i < new_size; i++) {
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new_array[i] = i;
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}
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arrays.append(std::move(new_array));
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current_array = arrays.last().data();
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std::atomic_thread_fence(std::memory_order_seq_cst);
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current_array_size = new_size;
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return Span<int64_t>(current_array + start_, size_);
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}
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} // namespace blender
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