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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <atomic>
#include <mutex>
#include "BLI_array.hh"
#include "BLI_index_range.hh"
#include "BLI_span.hh"
#include "BLI_vector.hh"
namespace blender {
static RawVector<RawArray<int64_t, 0>> arrays;
static int64_t current_array_size = 0;
static int64_t *current_array = nullptr;
static std::mutex current_array_mutex;
Span<int64_t> IndexRange::as_span() const
{
int64_t min_required_size = start_ + size_;
if (min_required_size <= current_array_size) {
return Span<int64_t>(current_array + start_, size_);
}
std::lock_guard<std::mutex> lock(current_array_mutex);
if (min_required_size <= current_array_size) {
return Span<int64_t>(current_array + start_, size_);
}
int64_t new_size = std::max<int64_t>(1000, power_of_2_max_u(min_required_size));
RawArray<int64_t, 0> new_array(new_size);
for (int64_t i = 0; i < new_size; i++) {
new_array[i] = i;
}
arrays.append(std::move(new_array));
current_array = arrays.last().data();
std::atomic_thread_fence(std::memory_order_seq_cst);
current_array_size = new_size;
return Span<int64_t>(current_array + start_, size_);
}
} // namespace blender
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