51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/int_types.h"
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#include "td/utils/port/thread.h"
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#include "td/utils/port/thread_local.h"
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#include <array>
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#include <atomic>
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namespace td {
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class ThreadSafeCounter {
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public:
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void add(int64 diff) {
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auto &node = thread_local_node();
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node.count_.store(node.count_.load(std::memory_order_relaxed) + diff, std::memory_order_relaxed);
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}
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int64 sum() const {
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int n = max_thread_id_.load();
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int64 res = 0;
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for (int i = 0; i < n; i++) {
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res += nodes_[i].count_.load();
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}
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return res;
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}
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private:
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struct Node {
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std::atomic<int64> count_{0};
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char padding[128];
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};
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static constexpr int MAX_THREAD_ID = 128;
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std::atomic<int> max_thread_id_{MAX_THREAD_ID};
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std::array<Node, MAX_THREAD_ID> nodes_;
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Node &thread_local_node() {
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auto thread_id = get_thread_id();
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CHECK(static_cast<size_t>(thread_id) < nodes_.size());
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return nodes_[thread_id];
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}
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};
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} // namespace td
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